CVE-2026-74592 (GCVE-0-2026-74592)
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:
ima: Instantiate file_truncate and path_truncate hooks
Instantiate the file_truncate and path_truncate LSM hooks to reset the
action cache flags (IMA_DONE_MASK) as soon as truncation is requested,
so the file, based on policy, is re-collected, re-measured, re-audited,
and re-appraised on next access.
References
| URL | Tags | |
|---|---|---|
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"security/integrity/ima/ima_main.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "5f46705d96eb60587aa7035acfcbec977e08d620",
"status": "affected",
"version": "3323eec921efd815178a23107ab63588c605c0b2",
"versionType": "git"
},
{
"lessThan": "dd21c96a71e876c8df9ec546b885a2c5f47bbb05",
"status": "affected",
"version": "3323eec921efd815178a23107ab63588c605c0b2",
"versionType": "git"
},
{
"lessThan": "0baed1fa2184c81e4baf76f445d3faa4b738c8f7",
"status": "affected",
"version": "3323eec921efd815178a23107ab63588c605c0b2",
"versionType": "git"
},
{
"lessThan": "b80bed5c871a80151351342c065579405ce77145",
"status": "affected",
"version": "3323eec921efd815178a23107ab63588c605c0b2",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"security/integrity/ima/ima_main.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.30"
},
{
"lessThan": "2.6.30",
"status": "unaffected",
"version": "0",
"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": "6.12.104",
"versionStartIncluding": "2.6.30",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.45",
"versionStartIncluding": "2.6.30",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.9",
"versionStartIncluding": "2.6.30",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "2.6.30",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nima: Instantiate file_truncate and path_truncate hooks\n\nInstantiate the file_truncate and path_truncate LSM hooks to reset the\naction cache flags (IMA_DONE_MASK) as soon as truncation is requested,\nso the file, based on policy, is re-collected, re-measured, re-audited,\nand re-appraised on next access."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The missing IMA hook is hit from vfs_truncate() via truncate/ftruncate/O_TRUNC syscalls and from ksmbd vfs_truncate on TCP/445; on IMA-enforced servers a remote SMB client with write access can truncate appraised files without clearing IMA_DONE_MASK, the highest-impact reachable path.\nAC:L - Once IMA policy is active, an attacker with write access can deterministically truncate a target file; security_path_truncate/file_truncate always run before do_truncate, so stale IMA_DONE_MASK persists reliably with no races or special memory layout.\nPR:L - Exploitation requires only standard file write permission (MAY_WRITE) on the target inode\u2014via local truncate/ftruncate or an authenticated ksmbd/NFS client with write ACL\u2014not real root or init-namespace capabilities beyond normal write access to the appraised file.\nUI:N - The attacker directly issues truncate/ftruncate or remote SETATTR/truncate operations; no victim must mount media, open a file, or perform any separate action beyond the attacker\u0027s own write/truncate request.\nS:U - The flaw defeats IMA measurement/appraisal caching within the same kernel integrity authority; it does not cross VM, hypervisor, IOMMU, or container sandbox boundaries.\nC:H - Stale IMA_APPRAISED flags let process_measurement() skip re-appraisal on exec/open, so attacker-modified truncated content in hash-appraised executables runs with a cached pass and can access any data reachable by that code.\nI:H - Without clearing IMA_DONE_MASK on truncation, modified file content retains cached IMA_MEASURED/IMA_APPRAISED state and bypasses re-measurement, re-audit, and re-appraisal, defeating the core IMA integrity guarantee for affected files.\nA:N - The bug is a stale-cache integrity bypass with no kernel memory corruption, oops, panic, hang, or deadlock; truncation may change individual file availability but does not inherently crash or deny the host kernel."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-25T05:40:20.017Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/5f46705d96eb60587aa7035acfcbec977e08d620"
},
{
"url": "https://git.kernel.org/stable/c/dd21c96a71e876c8df9ec546b885a2c5f47bbb05"
},
{
"url": "https://git.kernel.org/stable/c/0baed1fa2184c81e4baf76f445d3faa4b738c8f7"
},
{
"url": "https://git.kernel.org/stable/c/b80bed5c871a80151351342c065579405ce77145"
}
],
"title": "ima: Instantiate file_truncate and path_truncate hooks",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74592",
"datePublished": "2026-08-22T15:31:43.419Z",
"dateReserved": "2026-08-15T05:44:03.919Z",
"dateUpdated": "2026-08-25T05:40:20.017Z",
"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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