CVE-2026-74606 (GCVE-0-2026-74606)
Vulnerability from cvelistv5
Published
2026-08-22 15:31
Modified
2026-08-25 05:40
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
eventfs: Fix use-after-free in eventfs_remove_rec()
eventfs_remove_rec() recursively removes the child at the current loop
position. After the recursive call returns, list_for_each_entry() advances
by reading list.next from the removed child.
If free_ei() drops the final reference, release_ei() reuses the list/rcu
union to queue an SRCU callback. The child may be freed before that read.
The eventfs_mutex serializes list updates, but it does not keep the removed
child alive or prevent the SRCU callback from running.
Use list_for_each_entry_safe() to save the next sibling before recursively
removing the current child.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 5dfb04100326f70e3b2d2872c2476ed20b804837 Version: 43aa6f97c2d03a52c1ddb86768575fc84344bdbb Version: 43aa6f97c2d03a52c1ddb86768575fc84344bdbb Version: 43aa6f97c2d03a52c1ddb86768575fc84344bdbb Version: 43aa6f97c2d03a52c1ddb86768575fc84344bdbb Version: 5a43badefe0eccca0c26144c0a44b8d417ce8103 Version: 6.6.18 ≤ Version: 6.7.6 ≤ |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/tracefs/event_inode.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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{
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"status": "affected",
"version": "43aa6f97c2d03a52c1ddb86768575fc84344bdbb",
"versionType": "git"
},
{
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"status": "affected",
"version": "43aa6f97c2d03a52c1ddb86768575fc84344bdbb",
"versionType": "git"
},
{
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{
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"version": "5a43badefe0eccca0c26144c0a44b8d417ce8103",
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{
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"status": "affected",
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"versionType": "semver"
},
{
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"status": "affected",
"version": "6.7.6",
"versionType": "semver"
}
]
},
{
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"product": "Linux",
"programFiles": [
"fs/tracefs/event_inode.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.8"
},
{
"lessThan": "6.8",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.152",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.104",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.152",
"versionStartIncluding": "6.6.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.104",
"versionStartIncluding": "6.8",
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},
{
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{
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"versionStartIncluding": "6.8",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.7.6",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"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\u0027s 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."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-25T05:40:31.060Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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": {
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}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74606",
"datePublished": "2026-08-22T15:31:53.819Z",
"dateReserved": "2026-08-15T05:44:03.920Z",
"dateUpdated": "2026-08-25T05:40:31.060Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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