223 lines
12 KiB
JSON
223 lines
12 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2026-74606",
|
|
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "Linux",
|
|
"dateReserved": "2026-08-15T05:44:03.920Z",
|
|
"datePublished": "2026-08-22T15:31:53.819Z",
|
|
"dateUpdated": "2026-08-25T05:40:31.060Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"shortName": "Linux",
|
|
"dateUpdated": "2026-08-25T05:40:31.060Z"
|
|
},
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\neventfs: Fix use-after-free in eventfs_remove_rec()\n\neventfs_remove_rec() recursively removes the child at the current loop\nposition. After the recursive call returns, list_for_each_entry() advances\nby reading list.next from the removed child.\n\nIf free_ei() drops the final reference, release_ei() reuses the list/rcu\nunion to queue an SRCU callback. The child may be freed before that read.\nThe eventfs_mutex serializes list updates, but it does not keep the removed\nchild alive or prevent the SRCU callback from running.\n\nUse list_for_each_entry_safe() to save the next sibling before recursively\nremoving the current child."
|
|
}
|
|
],
|
|
"metrics": [
|
|
{
|
|
"cvssV3_1": {
|
|
"version": "3.1",
|
|
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
|
|
"baseScore": 7.8,
|
|
"baseSeverity": "HIGH"
|
|
},
|
|
"scenarios": [
|
|
{
|
|
"lang": "en",
|
|
"value": "AV:L - eventfs_remove_rec() is only reached via eventfs_remove_dir()/eventfs_remove_events_dir() during tracefs event teardown (instance rmdir, dynamic event removal, module unload); tracefs is a local pseudo-fs under /sys/kernel/tracing with no network, adjacent, or physical entry path.\nAC:L - The UAF is deterministic whenever a parent eventfs_inode has 2+ children: after recursively freeing the first child, list_for_each_entry() reads list.next from repurposed freed memory; an attacker can create multiple trace events then trigger parent teardown without uncontrollable races.\nPR:L - Exploitation needs local tracefs write (kprobe_events/dynamic_events to create events, rmdir on tracing instances); paths check LOCKDOWN_TRACEFS and DAC without capable(), and tracing-group gid mounts on Android/ChromeOS/dev systems commonly grant this to unprivileged users.\nUI:N - The attacker performs all tracefs operations to create multiple eventfs children and invoke teardown in their own session; no separate victim mount, click, or configuration action is required beyond tracefs already being accessible.\nS:U - The UAF corrupts kernel heap within the tracing/eventfs subsystem on the same host; it enables local privilege escalation but does not cross VM, IOMMU, container, or other security boundaries to a different authority.\nC:H - After free_ei(), release_ei() reuses the child's list/rcu union for SRCU teardown; list_for_each_entry() then reads list.next from freed/repurposed eventfs_inode memory, a standard kernel UAF read and information-disclosure primitive.\nI:H - Freed eventfs_inode slabs can be attacker-influenced via repeated trace-event create/delete; the corrupt sibling traversal enables heap grooming for arbitrary kernel writes and local privilege escalation, not merely a bounded crash.\nA:H - Reading list.next from a freed/repurposed eventfs_inode during recursive removal reliably causes invalid pointer dereferences, kernel oops, or panic; the fault is retriggerable by repeating trace-event setup and teardown cycles."
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"affected": [
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "unaffected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"fs/tracefs/event_inode.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "5dfb04100326f70e3b2d2872c2476ed20b804837",
|
|
"lessThan": "b77581b25e213e83b79ce11eb30024e55ceeb3e9",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "43aa6f97c2d03a52c1ddb86768575fc84344bdbb",
|
|
"lessThan": "f161d7861a0bfdf10af6b738b3b57636204661fb",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "43aa6f97c2d03a52c1ddb86768575fc84344bdbb",
|
|
"lessThan": "5635211b44969f4816e29ec4d5f8665fb39535d0",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "43aa6f97c2d03a52c1ddb86768575fc84344bdbb",
|
|
"lessThan": "74bb1eaf72d185a78c879eb2678ea500f82f46a8",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "43aa6f97c2d03a52c1ddb86768575fc84344bdbb",
|
|
"lessThan": "fd73b691702170d37d66f4b0278530cea8ed419a",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "5a43badefe0eccca0c26144c0a44b8d417ce8103",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "6.6.18",
|
|
"lessThan": "6.6.152",
|
|
"status": "affected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.7.6",
|
|
"lessThan": "6.8",
|
|
"status": "affected",
|
|
"versionType": "semver"
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "affected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"fs/tracefs/event_inode.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "6.8",
|
|
"status": "affected"
|
|
},
|
|
{
|
|
"version": "0",
|
|
"lessThan": "6.8",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.6.152",
|
|
"lessThanOrEqual": "6.6.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.12.104",
|
|
"lessThanOrEqual": "6.12.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.18.45",
|
|
"lessThanOrEqual": "6.18.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "7.1.9",
|
|
"lessThanOrEqual": "7.1.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "7.2",
|
|
"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": "6.6.18",
|
|
"versionEndExcluding": "6.6.152"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.8",
|
|
"versionEndExcluding": "6.12.104"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.8",
|
|
"versionEndExcluding": "6.18.45"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.8",
|
|
"versionEndExcluding": "7.1.9"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.8",
|
|
"versionEndExcluding": "7.2"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.7.6"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/b77581b25e213e83b79ce11eb30024e55ceeb3e9"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/f161d7861a0bfdf10af6b738b3b57636204661fb"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/5635211b44969f4816e29ec4d5f8665fb39535d0"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/74bb1eaf72d185a78c879eb2678ea500f82f46a8"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/fd73b691702170d37d66f4b0278530cea8ed419a"
|
|
}
|
|
],
|
|
"title": "eventfs: Fix use-after-free in eventfs_remove_rec()",
|
|
"x_generator": {
|
|
"engine": "bippy-1.2.0"
|
|
}
|
|
}
|
|
}
|
|
} |