{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2024-47794", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-01-09T09:49:29.737Z", "datePublished": "2025-01-11T12:25:14.419Z", "dateUpdated": "2026-05-11T20:40:12.822Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T20:40:12.822Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Prevent tailcall infinite loop caused by freplace\n\nThere is a potential infinite loop issue that can occur when using a\ncombination of tail calls and freplace.\n\nIn an upcoming selftest, the attach target for entry_freplace of\ntailcall_freplace.c is subprog_tc of tc_bpf2bpf.c, while the tail call in\nentry_freplace leads to entry_tc. This results in an infinite loop:\n\nentry_tc -> subprog_tc -> entry_freplace --tailcall-> entry_tc.\n\nThe problem arises because the tail_call_cnt in entry_freplace resets to\nzero each time entry_freplace is executed, causing the tail call mechanism\nto never terminate, eventually leading to a kernel panic.\n\nTo fix this issue, the solution is twofold:\n\n1. Prevent updating a program extended by an freplace program to a\n prog_array map.\n2. Prevent extending a program that is already part of a prog_array map\n with an freplace program.\n\nThis ensures that:\n\n* If a program or its subprogram has been extended by an freplace program,\n it can no longer be updated to a prog_array map.\n* If a program has been added to a prog_array map, neither it nor its\n subprograms can be extended by an freplace program.\n\nMoreover, an extension program should not be tailcalled. As such, return\n-EINVAL if the program has a type of BPF_PROG_TYPE_EXT when adding it to a\nprog_array map.\n\nAdditionally, fix a minor code style issue by replacing eight spaces with a\ntab for proper formatting."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/bpf.h", "kernel/bpf/arraymap.c", "kernel/bpf/core.c", "kernel/bpf/syscall.c", "kernel/bpf/trampoline.c"], "versions": [{"version": "be8704ff07d2374bcc5c675526f95e70c6459683", "lessThan": "987aa730bad3e1ef66d9f30182294daa78f6387d", "status": "affected", "versionType": "git"}, {"version": "be8704ff07d2374bcc5c675526f95e70c6459683", "lessThan": "d6083f040d5d8f8d748462c77e90547097df936e", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/bpf.h", "kernel/bpf/arraymap.c", "kernel/bpf/core.c", "kernel/bpf/syscall.c", "kernel/bpf/trampoline.c"], "versions": [{"version": "5.6", "status": "affected"}, {"version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.5", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13", "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": "5.6", "versionEndExcluding": "6.12.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.13"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/987aa730bad3e1ef66d9f30182294daa78f6387d"}, {"url": "https://git.kernel.org/stable/c/d6083f040d5d8f8d748462c77e90547097df936e"}], "title": "bpf: Prevent tailcall infinite loop caused by freplace", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "83E30040-8849-4588-B81C-AE479356574C", "versionEndExcluding": "6.12.5", "versionStartIncluding": "5.6", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Prevent tailcall infinite loop caused by freplace\n\nThere is a potential infinite loop issue that can occur when using a\ncombination of tail calls and freplace.\n\nIn an upcoming selftest, the attach target for entry_freplace of\ntailcall_freplace.c is subprog_tc of tc_bpf2bpf.c, while the tail call in\nentry_freplace leads to entry_tc. This results in an infinite loop:\n\nentry_tc -> subprog_tc -> entry_freplace --tailcall-> entry_tc.\n\nThe problem arises because the tail_call_cnt in entry_freplace resets to\nzero each time entry_freplace is executed, causing the tail call mechanism\nto never terminate, eventually leading to a kernel panic.\n\nTo fix this issue, the solution is twofold:\n\n1. Prevent updating a program extended by an freplace program to a\n prog_array map.\n2. Prevent extending a program that is already part of a prog_array map\n with an freplace program.\n\nThis ensures that:\n\n* If a program or its subprogram has been extended by an freplace program,\n it can no longer be updated to a prog_array map.\n* If a program has been added to a prog_array map, neither it nor its\n subprograms can be extended by an freplace program.\n\nMoreover, an extension program should not be tailcalled. As such, return\n-EINVAL if the program has a type of BPF_PROG_TYPE_EXT when adding it to a\nprog_array map.\n\nAdditionally, fix a minor code style issue by replacing eight spaces with a\ntab for proper formatting."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: Evitar bucle infinito de tailcall causado por freplace Existe un posible problema de bucle infinito que puede ocurrir al usar una combinaci\u00f3n de llamadas de cola y freplace. En una pr\u00f3xima autoprueba, el objetivo de conexi\u00f3n para entry_freplace de tailcall_freplace.c es subprog_tc de tc_bpf2bpf.c, mientras que la llamada de cola en entry_freplace conduce a entry_tc. Esto da como resultado un bucle infinito: entry_tc -> subprog_tc -> entry_freplace --tailcall-> entry_tc. El problema surge porque tail_call_cnt en entry_freplace se restablece a cero cada vez que se ejecuta entry_freplace, lo que hace que el mecanismo de llamada de cola nunca finalice, lo que finalmente conduce a un p\u00e1nico del kernel. Para solucionar este problema, la soluci\u00f3n es doble: 1. Evitar actualizar un programa extendido por un programa freplace a un mapa prog_array. 2. Evite extender un programa que ya es parte de un mapa prog_array con un programa freplace. Esto garantiza que: * Si un programa o su subprograma ha sido extendido por un programa freplace, ya no puede actualizarse a un mapa prog_array. * Si un programa ha sido agregado a un mapa prog_array, ni \u00e9l ni sus subprogramas pueden ser extendidos por un programa freplace. Adem\u00e1s, un programa de extensi\u00f3n no debe ser llamado al final. Como tal, devuelva -EINVAL si el programa tiene un tipo de BPF_PROG_TYPE_EXT al agregarlo a un mapa prog_array. Adem\u00e1s, solucione un problema menor de estilo de c\u00f3digo reemplazando ocho espacios con una tabulaci\u00f3n para un formato adecuado."}], "id": "CVE-2024-47794", "lastModified": "2025-09-23T16:20:16.803", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-01-11T13:15:22.390", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/987aa730bad3e1ef66d9f30182294daa78f6387d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d6083f040d5d8f8d748462c77e90547097df936e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-835"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: bpf: Prevent tailcall infinite loop caused by freplace", "id": "2337344", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2337344"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-835", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf: Prevent tailcall infinite loop caused by freplace\nThere is a potential infinite loop issue that can occur when using a\ncombination of tail calls and freplace.\nIn an upcoming selftest, the attach target for entry_freplace of\ntailcall_freplace.c is subprog_tc of tc_bpf2bpf.c, while the tail call in\nentry_freplace leads to entry_tc. This results in an infinite loop:\nentry_tc -> subprog_tc -> entry_freplace --tailcall-> entry_tc.\nThe problem arises because the tail_call_cnt in entry_freplace resets to\nzero each time entry_freplace is executed, causing the tail call mechanism\nto never terminate, eventually leading to a kernel panic.\nTo fix this issue, the solution is twofold:\n1. Prevent updating a program extended by an freplace program to a\nprog_array map.\n2. Prevent extending a program that is already part of a prog_array map\nwith an freplace program.\nThis ensures that:\n* If a program or its subprogram has been extended by an freplace program,\nit can no longer be updated to a prog_array map.\n* If a program has been added to a prog_array map, neither it nor its\nsubprograms can be extended by an freplace program.\nMoreover, an extension program should not be tailcalled. As such, return\n-EINVAL if the program has a type of BPF_PROG_TYPE_EXT when adding it to a\nprog_array map.\nAdditionally, fix a minor code style issue by replacing eight spaces with a\ntab for proper formatting."], "name": "CVE-2024-47794", "package_state": [{"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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-01-11T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-47794\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-47794\nhttps://lore.kernel.org/linux-cve-announce/2025011120-CVE-2024-47794-09e9@gregkh/T"], "statement": "The default Red Hat Enterprise Linux kernel prevents unprivileged users from being able to use eBPF by the kernel.unprivileged_bpf_disabled sysctl. This would require a privileged user with CAP_SYS_ADMIN or root to be able to abuse this flaw reducing its attack space.\nFor the Red Hat Enterprise Linux 9 to confirm the current state, inspect the sysctl with the command:\ncat /proc/sys/kernel/unprivileged_bpf_disabled\nThe setting of 1 would mean that unprivileged users can not use eBPF, mitigating the flaw.", "threat_severity": "Low"}

{"created": "2025-07-12T23:06:12.349771+00:00", "updated": "2025-07-12T23:06:12.349842+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}