{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2022-49851", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-05-01T14:05:17.230Z", "datePublished": "2025-05-01T14:10:06.274Z", "dateUpdated": "2026-05-11T19:07:59.104Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:07:59.104Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: fix reserved memory setup\n\nCurrently, RISC-V sets up reserved memory using the \"early\" copy of the\ndevice tree. As a result, when trying to get a reserved memory region\nusing of_reserved_mem_lookup(), the pointer to reserved memory regions\nis using the early, pre-virtual-memory address which causes a kernel\npanic when trying to use the buffer's name:\n\n Unable to handle kernel paging request at virtual address 00000000401c31ac\n Oops [#1]\n Modules linked in:\n CPU: 0 PID: 0 Comm: swapper Not tainted 6.0.0-rc1-00001-g0d9d6953d834 #1\n Hardware name: Microchip PolarFire-SoC Icicle Kit (DT)\n epc : string+0x4a/0xea\n ra : vsnprintf+0x1e4/0x336\n epc : ffffffff80335ea0 ra : ffffffff80338936 sp : ffffffff81203be0\n gp : ffffffff812e0a98 tp : ffffffff8120de40 t0 : 0000000000000000\n t1 : ffffffff81203e28 t2 : 7265736572203a46 s0 : ffffffff81203c20\n s1 : ffffffff81203e28 a0 : ffffffff81203d22 a1 : 0000000000000000\n a2 : ffffffff81203d08 a3 : 0000000081203d21 a4 : ffffffffffffffff\n a5 : 00000000401c31ac a6 : ffff0a00ffffff04 a7 : ffffffffffffffff\n s2 : ffffffff81203d08 s3 : ffffffff81203d00 s4 : 0000000000000008\n s5 : ffffffff000000ff s6 : 0000000000ffffff s7 : 00000000ffffff00\n s8 : ffffffff80d9821a s9 : ffffffff81203d22 s10: 0000000000000002\n s11: ffffffff80d9821c t3 : ffffffff812f3617 t4 : ffffffff812f3617\n t5 : ffffffff812f3618 t6 : ffffffff81203d08\n status: 0000000200000100 badaddr: 00000000401c31ac cause: 000000000000000d\n [<ffffffff80338936>] vsnprintf+0x1e4/0x336\n [<ffffffff80055ae2>] vprintk_store+0xf6/0x344\n [<ffffffff80055d86>] vprintk_emit+0x56/0x192\n [<ffffffff80055ed8>] vprintk_default+0x16/0x1e\n [<ffffffff800563d2>] vprintk+0x72/0x80\n [<ffffffff806813b2>] _printk+0x36/0x50\n [<ffffffff8068af48>] print_reserved_mem+0x1c/0x24\n [<ffffffff808057ec>] paging_init+0x528/0x5bc\n [<ffffffff808031ae>] setup_arch+0xd0/0x592\n [<ffffffff8080070e>] start_kernel+0x82/0x73c\n\nearly_init_fdt_scan_reserved_mem() takes no arguments as it operates on\ninitial_boot_params, which is populated by early_init_dt_verify(). On\nRISC-V, early_init_dt_verify() is called twice. Once, directly, in\nsetup_arch() if CONFIG_BUILTIN_DTB is not enabled and once indirectly,\nvery early in the boot process, by parse_dtb() when it calls\nearly_init_dt_scan_nodes().\n\nThis first call uses dtb_early_va to set initial_boot_params, which is\nnot usable later in the boot process when\nearly_init_fdt_scan_reserved_mem() is called. On arm64 for example, the\ncorresponding call to early_init_dt_scan_nodes() uses fixmap addresses\nand doesn't suffer the same fate.\n\nMove early_init_fdt_scan_reserved_mem() further along the boot sequence,\nafter the direct call to early_init_dt_verify() in setup_arch() so that\nthe names use the correct virtual memory addresses. The above supposed\nthat CONFIG_BUILTIN_DTB was not set, but should work equally in the case\nwhere it is - unflatted_and_copy_device_tree() also updates\ninitial_boot_params."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/riscv/kernel/setup.c", "arch/riscv/mm/init.c"], "versions": [{"version": "922b0375fc93fb1a20c5617e37c389c26bbccb70", "lessThan": "94ab8f88feb75e3b1486102c0c9c550f37d9d137", "status": "affected", "versionType": "git"}, {"version": "922b0375fc93fb1a20c5617e37c389c26bbccb70", "lessThan": "518e49f0590de66555503aabe199ba8d3f2e24ac", "status": "affected", "versionType": "git"}, {"version": "922b0375fc93fb1a20c5617e37c389c26bbccb70", "lessThan": "93598deb101540c4f9e7de15099ea8255b965fc2", "status": "affected", "versionType": "git"}, {"version": "922b0375fc93fb1a20c5617e37c389c26bbccb70", "lessThan": "50e63dd8ed92045eb70a72d7ec725488320fb68b", "status": "affected", "versionType": "git"}, {"version": "f18ed5bee7bb8a0e99e1c7e7d45e0e51d3497248", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/riscv/kernel/setup.c", "arch/riscv/mm/init.c"], "versions": [{"version": "5.4", "status": "affected"}, {"version": "0", "lessThan": "5.4", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.155", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.79", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.0.9", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "5.10.155"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "5.15.79"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.0.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "6.1"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3.8"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/94ab8f88feb75e3b1486102c0c9c550f37d9d137"}, {"url": "https://git.kernel.org/stable/c/518e49f0590de66555503aabe199ba8d3f2e24ac"}, {"url": "https://git.kernel.org/stable/c/93598deb101540c4f9e7de15099ea8255b965fc2"}, {"url": "https://git.kernel.org/stable/c/50e63dd8ed92045eb70a72d7ec725488320fb68b"}], "title": "riscv: fix reserved memory setup", "x_generator": {"engine": "bippy-1.2.0"}}}}

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As a result, when trying to get a reserved memory region\nusing of_reserved_mem_lookup(), the pointer to reserved memory regions\nis using the early, pre-virtual-memory address which causes a kernel\npanic when trying to use the buffer's name:\n\n Unable to handle kernel paging request at virtual address 00000000401c31ac\n Oops [#1]\n Modules linked in:\n CPU: 0 PID: 0 Comm: swapper Not tainted 6.0.0-rc1-00001-g0d9d6953d834 #1\n Hardware name: Microchip PolarFire-SoC Icicle Kit (DT)\n epc : string+0x4a/0xea\n ra : vsnprintf+0x1e4/0x336\n epc : ffffffff80335ea0 ra : ffffffff80338936 sp : ffffffff81203be0\n gp : ffffffff812e0a98 tp : ffffffff8120de40 t0 : 0000000000000000\n t1 : ffffffff81203e28 t2 : 7265736572203a46 s0 : ffffffff81203c20\n s1 : ffffffff81203e28 a0 : ffffffff81203d22 a1 : 0000000000000000\n a2 : ffffffff81203d08 a3 : 0000000081203d21 a4 : ffffffffffffffff\n a5 : 00000000401c31ac a6 : ffff0a00ffffff04 a7 : ffffffffffffffff\n s2 : ffffffff81203d08 s3 : ffffffff81203d00 s4 : 0000000000000008\n s5 : ffffffff000000ff s6 : 0000000000ffffff s7 : 00000000ffffff00\n s8 : ffffffff80d9821a s9 : ffffffff81203d22 s10: 0000000000000002\n s11: ffffffff80d9821c t3 : ffffffff812f3617 t4 : ffffffff812f3617\n t5 : ffffffff812f3618 t6 : ffffffff81203d08\n status: 0000000200000100 badaddr: 00000000401c31ac cause: 000000000000000d\n [<ffffffff80338936>] vsnprintf+0x1e4/0x336\n [<ffffffff80055ae2>] vprintk_store+0xf6/0x344\n [<ffffffff80055d86>] vprintk_emit+0x56/0x192\n [<ffffffff80055ed8>] vprintk_default+0x16/0x1e\n [<ffffffff800563d2>] vprintk+0x72/0x80\n [<ffffffff806813b2>] _printk+0x36/0x50\n [<ffffffff8068af48>] print_reserved_mem+0x1c/0x24\n [<ffffffff808057ec>] paging_init+0x528/0x5bc\n [<ffffffff808031ae>] setup_arch+0xd0/0x592\n [<ffffffff8080070e>] start_kernel+0x82/0x73c\n\nearly_init_fdt_scan_reserved_mem() takes no arguments as it operates on\ninitial_boot_params, which is populated by early_init_dt_verify(). On\nRISC-V, early_init_dt_verify() is called twice. Once, directly, in\nsetup_arch() if CONFIG_BUILTIN_DTB is not enabled and once indirectly,\nvery early in the boot process, by parse_dtb() when it calls\nearly_init_dt_scan_nodes().\n\nThis first call uses dtb_early_va to set initial_boot_params, which is\nnot usable later in the boot process when\nearly_init_fdt_scan_reserved_mem() is called. On arm64 for example, the\ncorresponding call to early_init_dt_scan_nodes() uses fixmap addresses\nand doesn't suffer the same fate.\n\nMove early_init_fdt_scan_reserved_mem() further along the boot sequence,\nafter the direct call to early_init_dt_verify() in setup_arch() so that\nthe names use the correct virtual memory addresses. The above supposed\nthat CONFIG_BUILTIN_DTB was not set, but should work equally in the case\nwhere it is - unflatted_and_copy_device_tree() also updates\ninitial_boot_params."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: riscv: correcci\u00f3n de la configuraci\u00f3n de memoria reservada Actualmente, RISC-V configura la memoria reservada utilizando la copia \"temprana\" del \u00e1rbol de dispositivos. Como resultado, al intentar obtener una regi\u00f3n de memoria reservada usando of_reserved_mem_lookup(), el puntero a las regiones de memoria reservadas usa la direcci\u00f3n anterior a la memoria virtual, lo que causa un p\u00e1nico del kernel al intentar usar el nombre del b\u00fafer: Unable to handle kernel paging request at virtual address 00000000401c31ac Oops [#1] M\u00f3dulos vinculados: CPU: 0 PID: 0 Comm: swapper Not tainted 6.0.0-rc1-00001-g0d9d6953d834 #1 Nombre del hardware: Microchip PolarFire-SoC Icicle Kit (DT) epc : string+0x4a/0xea ra : vsnprintf+0x1e4/0x336 epc : ffffffff80335ea0 ra : ffffffff80338936 sp : ffffffff81203be0 gp: ffffffff812e0a98 tp: ffffffff8120de40 t0: 0000000000000000 t1: ffffffff81203e28 t2: 7265736572203a46 s0: ffffffff81203c20 s1: ffffffff81203e28 a0: ffffffff81203d22 a1: 0000000000000000 a2: ffffffff81203d08 a3: 0000000081203d21 a4: ffffffffffffffff a5: 00000000401c31ac a6 : ffff0a00ffffff04 a7 : ffffffffffffffff s2 : ffffffff81203d08 s3 : ffffffff81203d00 s4 : 0000000000000008 s5 : ffffffff000000ff s6 : 0000000000ffffff s7 : 00000000ffffff00 s8 : ffffffff80d9821a s9 : ffffffff81203d22 s10: 000000000000002 s11: ffffffff80d9821c t3 : ffffffff812f3617 t4: ffffffff812f3617 t5: ffffffff812f3618 t6: ffffffff81203d08 estado: 0000000200000100 direcci\u00f3n incorrecta: 00000000401c31ac causa: 000000000000000d [] vsnprintf+0x1e4/0x336 [] vprintk_store+0xf6/0x344 [] vprintk_emit+0x56/0x192 [] vprintk_default+0x16/0x1e [] vprintk+0x72/0x80 [] _printk+0x36/0x50 [] print_reserved_mem+0x1c/0x24 [] paging_init+0x528/0x5bc [] setup_arch+0xd0/0x592 [] start_kernel+0x82/0x73c early_init_fdt_scan_reserved_mem() no toma argumentos ya que opera en initial_boot_params, que se completa con early_init_dt_verify(). En RISC-V, early_init_dt_verify() se llama dos veces: una directamente, en setup_arch() si CONFIG_BUILTIN_DTB no est\u00e1 habilitado, y otra indirectamente, en una fase muy temprana del proceso de arranque, mediante parse_dtb() al llamar a early_init_dt_scan_nodes(). Esta primera llamada utiliza dtb_early_va para establecer initial_boot_params, que no se puede utilizar posteriormente en el proceso de arranque cuando se llama a early_init_fdt_scan_reserved_mem(). En arm64, por ejemplo, la llamada correspondiente a early_init_dt_scan_nodes() utiliza direcciones fixmap y no sufre el mismo problema. Desplace early_init_fdt_scan_reserved_mem() m\u00e1s adelante en la secuencia de arranque, despu\u00e9s de la llamada directa a early_init_dt_verify() en setup_arch() para que los nombres utilicen las direcciones de memoria virtual correctas. Lo anterior supuso que CONFIG_BUILTIN_DTB no estaba configurado, pero deber\u00eda funcionar igualmente en el caso en que lo est\u00e9: unflatted_and_copy_device_tree() tambi\u00e9n actualiza initial_boot_params."}], "id": "CVE-2022-49851", "lastModified": "2025-11-10T21:02:56.937", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-05-01T15:16:08.680", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/50e63dd8ed92045eb70a72d7ec725488320fb68b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/518e49f0590de66555503aabe199ba8d3f2e24ac"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/93598deb101540c4f9e7de15099ea8255b965fc2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/94ab8f88feb75e3b1486102c0c9c550f37d9d137"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: riscv: fix reserved memory setup", "id": "2363500", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2363500"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nriscv: fix reserved memory setup\nCurrently, RISC-V sets up reserved memory using the \"early\" copy of the\ndevice tree. As a result, when trying to get a reserved memory region\nusing of_reserved_mem_lookup(), the pointer to reserved memory regions\nis using the early, pre-virtual-memory address which causes a kernel\npanic when trying to use the buffer's name:\nUnable to handle kernel paging request at virtual address 00000000401c31ac\nOops [#1]\nModules linked in:\nCPU: 0 PID: 0 Comm: swapper Not tainted 6.0.0-rc1-00001-g0d9d6953d834 #1\nHardware name: Microchip PolarFire-SoC Icicle Kit (DT)\nepc : string+0x4a/0xea\nra : vsnprintf+0x1e4/0x336\nepc : ffffffff80335ea0 ra : ffffffff80338936 sp : ffffffff81203be0\ngp : ffffffff812e0a98 tp : ffffffff8120de40 t0 : 0000000000000000\nt1 : ffffffff81203e28 t2 : 7265736572203a46 s0 : ffffffff81203c20\ns1 : ffffffff81203e28 a0 : ffffffff81203d22 a1 : 0000000000000000\na2 : ffffffff81203d08 a3 : 0000000081203d21 a4 : ffffffffffffffff\na5 : 00000000401c31ac a6 : ffff0a00ffffff04 a7 : ffffffffffffffff\ns2 : ffffffff81203d08 s3 : ffffffff81203d00 s4 : 0000000000000008\ns5 : ffffffff000000ff s6 : 0000000000ffffff s7 : 00000000ffffff00\ns8 : ffffffff80d9821a s9 : ffffffff81203d22 s10: 0000000000000002\ns11: ffffffff80d9821c t3 : ffffffff812f3617 t4 : ffffffff812f3617\nt5 : ffffffff812f3618 t6 : ffffffff81203d08\nstatus: 0000000200000100 badaddr: 00000000401c31ac cause: 000000000000000d\n[<ffffffff80338936>] vsnprintf+0x1e4/0x336\n[<ffffffff80055ae2>] vprintk_store+0xf6/0x344\n[<ffffffff80055d86>] vprintk_emit+0x56/0x192\n[<ffffffff80055ed8>] vprintk_default+0x16/0x1e\n[<ffffffff800563d2>] vprintk+0x72/0x80\n[<ffffffff806813b2>] _printk+0x36/0x50\n[<ffffffff8068af48>] print_reserved_mem+0x1c/0x24\n[<ffffffff808057ec>] paging_init+0x528/0x5bc\n[<ffffffff808031ae>] setup_arch+0xd0/0x592\n[<ffffffff8080070e>] start_kernel+0x82/0x73c\nearly_init_fdt_scan_reserved_mem() takes no arguments as it operates on\ninitial_boot_params, which is populated by early_init_dt_verify(). On\nRISC-V, early_init_dt_verify() is called twice. Once, directly, in\nsetup_arch() if CONFIG_BUILTIN_DTB is not enabled and once indirectly,\nvery early in the boot process, by parse_dtb() when it calls\nearly_init_dt_scan_nodes().\nThis first call uses dtb_early_va to set initial_boot_params, which is\nnot usable later in the boot process when\nearly_init_fdt_scan_reserved_mem() is called. On arm64 for example, the\ncorresponding call to early_init_dt_scan_nodes() uses fixmap addresses\nand doesn't suffer the same fate.\nMove early_init_fdt_scan_reserved_mem() further along the boot sequence,\nafter the direct call to early_init_dt_verify() in setup_arch() so that\nthe names use the correct virtual memory addresses. The above supposed\nthat CONFIG_BUILTIN_DTB was not set, but should work equally in the case\nwhere it is - unflatted_and_copy_device_tree() also updates\ninitial_boot_params."], "name": "CVE-2022-49851", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49851\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49851\nhttps://lore.kernel.org/linux-cve-announce/2025050144-CVE-2022-49851-6309@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-12T22:15:41.611004+00:00", "updated": "2025-07-12T22:15:41.611071+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}