{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43249", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.996Z", "datePublished": "2026-05-06T11:28:40.290Z", "dateUpdated": "2026-05-11T22:20:53.635Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:20:53.635Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\n9p/xen: protect xen_9pfs_front_free against concurrent calls\n\nThe xenwatch thread can race with other back-end change notifications\nand call xen_9pfs_front_free() twice, hitting the observed general\nprotection fault due to a double-free. Guard the teardown path so only\none caller can release the front-end state at a time, preventing the\ncrash.\n\nThis is a fix for the following double-free:\n\n[ 27.052347] Oops: general protection fault, probably for non-canonical address 0x6b6b6b6b6b6b6b6b: 0000 [#1] SMP DEBUG_PAGEALLOC NOPTI\n[ 27.052357] CPU: 0 UID: 0 PID: 32 Comm: xenwatch Not tainted 6.18.0-02087-g51ab33fc0a8b-dirty #60 PREEMPT(none)\n[ 27.052363] RIP: e030:xen_9pfs_front_free+0x1d/0x150\n[ 27.052368] Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 41 55 41 54 55 48 89 fd 48 c7 c7 48 d0 92 85 53 e8 cb cb 05 00 48 8b 45 08 48 8b 55 00 <48> 3b 28 0f 85 f9 28 35 fe 48 3b 6a 08 0f 85 ef 28 35 fe 48 89 42\n[ 27.052377] RSP: e02b:ffffc9004016fdd0 EFLAGS: 00010246\n[ 27.052381] RAX: 6b6b6b6b6b6b6b6b RBX: ffff88800d66e400 RCX: 0000000000000000\n[ 27.052385] RDX: 6b6b6b6b6b6b6b6b RSI: 0000000000000000 RDI: 0000000000000000\n[ 27.052389] RBP: ffff88800a887040 R08: 0000000000000000 R09: 0000000000000000\n[ 27.052393] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888009e46b68\n[ 27.052397] R13: 0000000000000200 R14: 0000000000000000 R15: ffff88800a887040\n[ 27.052404] FS: 0000000000000000(0000) GS:ffff88808ca57000(0000) knlGS:0000000000000000\n[ 27.052408] CS: e030 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 27.052412] CR2: 00007f9714004360 CR3: 0000000004834000 CR4: 0000000000050660\n[ 27.052418] Call Trace:\n[ 27.052420] <TASK>\n[ 27.052422] xen_9pfs_front_changed+0x5d5/0x720\n[ 27.052426] ? xenbus_otherend_changed+0x72/0x140\n[ 27.052430] ? __pfx_xenwatch_thread+0x10/0x10\n[ 27.052434] xenwatch_thread+0x94/0x1c0\n[ 27.052438] ? __pfx_autoremove_wake_function+0x10/0x10\n[ 27.052442] kthread+0xf8/0x240\n[ 27.052445] ? __pfx_kthread+0x10/0x10\n[ 27.052449] ? __pfx_kthread+0x10/0x10\n[ 27.052452] ret_from_fork+0x16b/0x1a0\n[ 27.052456] ? __pfx_kthread+0x10/0x10\n[ 27.052459] ret_from_fork_asm+0x1a/0x30\n[ 27.052463] </TASK>\n[ 27.052465] Modules linked in:\n[ 27.052471] ---[ end trace 0000000000000000 ]---"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/9p/trans_xen.c"], "versions": [{"version": "c15fe55d14b3b4ded5af2a3260877460a6ffb8ad", "lessThan": "a5d00dff97118a32fcf5fec7a4c3f864c4620c4e", "status": "affected", "versionType": "git"}, {"version": "c15fe55d14b3b4ded5af2a3260877460a6ffb8ad", "lessThan": "59e7707492576bdbfa8c1dbe7d90791df31e4773", "status": "affected", "versionType": "git"}, {"version": "c15fe55d14b3b4ded5af2a3260877460a6ffb8ad", "lessThan": "bf841d43f7a33d75675ba7f4e214ac1c67913065", "status": "affected", "versionType": "git"}, {"version": "c15fe55d14b3b4ded5af2a3260877460a6ffb8ad", "lessThan": "ce8ded2e61f47747e31eeefb44dc24a2160a7e32", "status": "affected", "versionType": "git"}, {"version": "be03c4fe72384366fd4077a70966bd3b8fc49013", "status": "affected", "versionType": "git"}, {"version": "1ab4de11232e83b875b071aa44d1155634ca8a1e", "status": "affected", "versionType": "git"}, {"version": "7cc9dbae8a5f73bd555130384ea256018d28f283", "status": "affected", "versionType": "git"}, {"version": "3e0359f151ac151abe3fa71040e450ed69cb824b", "status": "affected", "versionType": "git"}, {"version": "8d3fc907d060c4fb33203e616a395a22083b6566", "status": "affected", "versionType": "git"}, {"version": "4f0e9244770f5b75a16d8c0929063cd336926764", "status": "affected", "versionType": "git"}, {"version": "5f6a8974e9ef317fe63f88bab1f33070195dd147", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/9p/trans_xen.c"], "versions": [{"version": "6.3", "status": "affected"}, {"version": "0", "lessThan": "6.3", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.75", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.16", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.6", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.3", "versionEndExcluding": "6.12.75"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.18.16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.19.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "7.0"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14.308"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.276"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.235"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.173"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.100"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.18"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2.5"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/a5d00dff97118a32fcf5fec7a4c3f864c4620c4e"}, {"url": "https://git.kernel.org/stable/c/59e7707492576bdbfa8c1dbe7d90791df31e4773"}, {"url": "https://git.kernel.org/stable/c/bf841d43f7a33d75675ba7f4e214ac1c67913065"}, {"url": "https://git.kernel.org/stable/c/ce8ded2e61f47747e31eeefb44dc24a2160a7e32"}], "title": "9p/xen: protect xen_9pfs_front_free against concurrent calls", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9E08C858-E25B-40F9-B5B6-344EFFDB2285", "versionEndExcluding": "6.12.75", "versionStartIncluding": "4.14.308", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B", "versionEndExcluding": "6.18.16", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67", "versionEndExcluding": "6.19.6", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\n9p/xen: protect xen_9pfs_front_free against concurrent calls\n\nThe xenwatch thread can race with other back-end change notifications\nand call xen_9pfs_front_free() twice, hitting the observed general\nprotection fault due to a double-free. Guard the teardown path so only\none caller can release the front-end state at a time, preventing the\ncrash.\n\nThis is a fix for the following double-free:\n\n[ 27.052347] Oops: general protection fault, probably for non-canonical address 0x6b6b6b6b6b6b6b6b: 0000 [#1] SMP DEBUG_PAGEALLOC NOPTI\n[ 27.052357] CPU: 0 UID: 0 PID: 32 Comm: xenwatch Not tainted 6.18.0-02087-g51ab33fc0a8b-dirty #60 PREEMPT(none)\n[ 27.052363] RIP: e030:xen_9pfs_front_free+0x1d/0x150\n[ 27.052368] Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 41 55 41 54 55 48 89 fd 48 c7 c7 48 d0 92 85 53 e8 cb cb 05 00 48 8b 45 08 48 8b 55 00 <48> 3b 28 0f 85 f9 28 35 fe 48 3b 6a 08 0f 85 ef 28 35 fe 48 89 42\n[ 27.052377] RSP: e02b:ffffc9004016fdd0 EFLAGS: 00010246\n[ 27.052381] RAX: 6b6b6b6b6b6b6b6b RBX: ffff88800d66e400 RCX: 0000000000000000\n[ 27.052385] RDX: 6b6b6b6b6b6b6b6b RSI: 0000000000000000 RDI: 0000000000000000\n[ 27.052389] RBP: ffff88800a887040 R08: 0000000000000000 R09: 0000000000000000\n[ 27.052393] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888009e46b68\n[ 27.052397] R13: 0000000000000200 R14: 0000000000000000 R15: ffff88800a887040\n[ 27.052404] FS: 0000000000000000(0000) GS:ffff88808ca57000(0000) knlGS:0000000000000000\n[ 27.052408] CS: e030 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 27.052412] CR2: 00007f9714004360 CR3: 0000000004834000 CR4: 0000000000050660\n[ 27.052418] Call Trace:\n[ 27.052420] <TASK>\n[ 27.052422] xen_9pfs_front_changed+0x5d5/0x720\n[ 27.052426] ? xenbus_otherend_changed+0x72/0x140\n[ 27.052430] ? __pfx_xenwatch_thread+0x10/0x10\n[ 27.052434] xenwatch_thread+0x94/0x1c0\n[ 27.052438] ? __pfx_autoremove_wake_function+0x10/0x10\n[ 27.052442] kthread+0xf8/0x240\n[ 27.052445] ? __pfx_kthread+0x10/0x10\n[ 27.052449] ? __pfx_kthread+0x10/0x10\n[ 27.052452] ret_from_fork+0x16b/0x1a0\n[ 27.052456] ? __pfx_kthread+0x10/0x10\n[ 27.052459] ret_from_fork_asm+0x1a/0x30\n[ 27.052463] </TASK>\n[ 27.052465] Modules linked in:\n[ 27.052471] ---[ end trace 0000000000000000 ]---"}], "id": "CVE-2026-43249", "lastModified": "2026-05-11T13:10:20.973", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-06T12:16:45.493", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/59e7707492576bdbfa8c1dbe7d90791df31e4773"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a5d00dff97118a32fcf5fec7a4c3f864c4620c4e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bf841d43f7a33d75675ba7f4e214ac1c67913065"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ce8ded2e61f47747e31eeefb44dc24a2160a7e32"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-415"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: 9p/xen: protect xen_9pfs_front_free against concurrent calls", "id": "2467119", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467119"}, "csaw": false, "cwe": "CWE-364", "details": ["A flaw was found in the Linux kernel's 9p/xen filesystem driver. A race condition can occur when the xenwatch thread and other back-end change notifications concurrently attempt to free the front-end state using the xen_9pfs_front_free function. This can lead to a double-free vulnerability, resulting in a general protection fault and causing a system crash. This issue primarily impacts system availability."], "name": "CVE-2026-43249", "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": "2026-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43249\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43249\nhttps://lore.kernel.org/linux-cve-announce/2026050602-CVE-2026-43249-f246@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,a5d00dff97118a32fcf5fec7a4c3f864c4620c4e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,59e7707492576bdbfa8c1dbe7d90791df31e4773)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,bf841d43f7a33d75675ba7f4e214ac1c67913065)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,ce8ded2e61f47747e31eeefb44dc24a2160a7e32)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.75,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.16,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.6,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-06T14:30:05.886107+00:00", "updated": "2026-05-11T18:30:05.553362+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}