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vuln-cve/data/2026/43xxx/CVE-2026-43249.json
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{
"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": "2026-10-30T12:25:17.710Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-30T12:25:17.710Z"
},
"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"
},
"scenarios": [
{
"lang": "en",
"value": "AV:A - The vulnerable 9p Xen frontend is reached through Xenbus/backend state changes from a paired Xen backend or service domain on the same host/logical I/O fabric. It is not directly routable over IP, but it is reachable across an adjacent inter-domain channel.\nAC:L - A malicious backend can repeatedly queue the state transitions/removal paths that lead to concurrent or repeated xen_9pfs_front_free() calls. The trigger does not depend on conditions outside the attacker-controlled backend notification sequence.\nPR:N - No privileges in the vulnerable guest are required; the guest frontend accepts the triggering state changes from its configured backend via Xenstore. Control of the backend is the attack position rather than a credential inside the target Linux kernel.\nUI:N - No victim user action is needed after the Xen 9pfs frontend device is present and bound. Backend state changes are processed asynchronously by xenwatch.\nS:U - The corrupted objects and resulting crash/code-execution risk are within the same guest Linux kernel running the vulnerable frontend. The issue does not demonstrate a guest-to-host or hypervisor escape.\nC:H - This is kernel heap memory corruption via double-free of frontend state and associated ring resources. Such corruption can plausibly be shaped into use-after-free/freelist manipulation and arbitrary kernel memory disclosure, so the higher impact is warranted.\nI:H - The double-free can corrupt kernel allocator metadata or free a reallocated object, giving a plausible path to arbitrary write or control-flow compromise. Under the required uncertainty rule, this is scored as high integrity impact.\nA:H - The reported failure is a general protection fault in xenwatch from dereferencing poisoned freed memory. A malicious backend can crash the guest kernel, causing high availability impact."
}
]
}
],
"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": "4f0e9244770f5b75a16d8c0929063cd336926764",
"lessThan": "056709e2c6f121548df108a9fef2d1430b233e56",
"status": "affected",
"versionType": "git"
},
{
"version": "c15fe55d14b3b4ded5af2a3260877460a6ffb8ad",
"lessThan": "480aa6ffd4ac7036eea042047d0cca71bc2074bb",
"status": "affected",
"versionType": "git"
},
{
"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": "5f6a8974e9ef317fe63f88bab1f33070195dd147",
"status": "affected",
"versionType": "git"
},
{
"version": "6.1.18",
"lessThan": "6.1.191",
"status": "affected",
"versionType": "semver"
},
{
"version": "4.14.308",
"lessThan": "4.15",
"status": "affected",
"versionType": "semver"
},
{
"version": "4.19.276",
"lessThan": "4.20",
"status": "affected",
"versionType": "semver"
},
{
"version": "5.4.235",
"lessThan": "5.5",
"status": "affected",
"versionType": "semver"
},
{
"version": "5.10.173",
"lessThan": "5.11",
"status": "affected",
"versionType": "semver"
},
{
"version": "5.15.100",
"lessThan": "5.16",
"status": "affected",
"versionType": "semver"
},
{
"version": "6.2.5",
"lessThan": "6.3",
"status": "affected",
"versionType": "semver"
}
]
},
{
"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": "6.1.191",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.160",
"lessThanOrEqual": "6.6.*",
"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": "6.1.18",
"versionEndExcluding": "6.1.191"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.3",
"versionEndExcluding": "6.6.160"
},
{
"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": "6.2.5"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/056709e2c6f121548df108a9fef2d1430b233e56"
},
{
"url": "https://git.kernel.org/stable/c/480aa6ffd4ac7036eea042047d0cca71bc2074bb"
},
{
"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"
}
}
}
}
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