Unknown

CVE-2026-74671 — ima: fix out-of-bounds read in xattr_verify()

In the Linux kernel, the following vulnerability has been resolved: ima: fix out-of-bounds read in xattr_verify() The digest-length check in xattr_verify() mixes int and size_t: if (xattr_len - sizeof(xattr_value->type) - hash_start >= iint->ima_hash->length) sizeof() yields size_t, so the usual arithmetic conversions promote the whole left-hand side to unsigned 64-bit before the subtraction runs. For a truncated xattr this underflows instead of going negative: a 1-byte IMA_XATTR_DIGEST_NG xattr (xattr_len == 1, hash_start == 1) turns "1 - 1 - 1" into SIZE_MAX, which is trivially >= ima_hash->length. The check then passes and the following memcmp() reads iint->ima_hash->length bytes starting past the end of the buffer vfs_getxattr_alloc() allocated for it. Nothing upstream clamps xattr_len back into a safe range first: ima_get_hash_algo() only special-cases xattr_len < 2 to pick a default algorithm, and evm_verifyxattr() returns INTEGRITY_UNKNOWN rather than failing when no HMAC key is loaded, so a truncated security.ima value reaches the length check as-is. Rewrite the comparison so every operand stays a signed int and no implicit conversion to size_t can occur.

Published Aug 22, 2026 · Updated Oct 14, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.18%

ahead of 7% of scored CVEs · Oct 14, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ 3ea7a56067e663278470c04fd655adf809e72d4d and < d823b5f4557083d1dd92096f796a78a2b1b06d10≥ 3ea7a56067e663278470c04fd655adf809e72d4d and < caeb105c15ea2431fa8da7ecfa242d0c68272426≥ 3ea7a56067e663278470c04fd655adf809e72d4d and < a784b4732ac7e51862b9b210c2d8b2ab9e83568c≥ 3ea7a56067e663278470c04fd655adf809e72d4d and < b6cb134707a2127d90a58d69dd818679cae8033c≥ 3ea7a56067e663278470c04fd655adf809e72d4d and < 7e515b6c9aab452a4f0734bd7208e4e780e164ca≥ 3ea7a56067e663278470c04fd655adf809e72d4d and < 27f3924061592d0ef6b04e16f48754b6cb6adf27≥ 3ea7a56067e663278470c04fd655adf809e72d4d and < dd04114af0d451091f7b8cbd26d9e37d011e9131≥ 3ea7a56067e663278470c04fd655adf809e72d4d and < 5ff232d31106f45ac87c3b64e1d35a0667777797 and 1 more version 3.13	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.18%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 14, 2026
Affected products added · linux/linux
Oct 14, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 14, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 14, 2026 · NIST National Vulnerability Database
CVE published
Aug 22, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 14, 2026 – Oct 14, 2026
1× Official description updated · Oct 14, 2026 – Oct 14, 2026

References

10 on the record

github.com/advisories/GHSA-g8m3-q9h2-qp8g
GitHub Security Advisories
git.kernel.org/stable/c/d823b5f4557083d1dd92096f796a78a2b1b06d10
NIST National Vulnerability Database
git.kernel.org/stable/c/caeb105c15ea2431fa8da7ecfa242d0c68272426
NIST National Vulnerability Database
git.kernel.org/stable/c/5ff232d31106f45ac87c3b64e1d35a0667777797
NIST National Vulnerability Database
git.kernel.org/stable/c/b6cb134707a2127d90a58d69dd818679cae8033c
NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2026-74671
GitHub Security Advisories
git.kernel.org/stable/c/7e515b6c9aab452a4f0734bd7208e4e780e164ca
NIST National Vulnerability Database
git.kernel.org/stable/c/a784b4732ac7e51862b9b210c2d8b2ab9e83568c
NIST National Vulnerability Database
git.kernel.org/stable/c/27f3924061592d0ef6b04e16f48754b6cb6adf27
NIST National Vulnerability Database
git.kernel.org/stable/c/dd04114af0d451091f7b8cbd26d9e37d011e9131
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 9h
Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 9h
Unknown CVE-2026-98424 wifi: cfg80211: undo netns switch if renaming the wiphy fails 1d
Unknown CVE-2026-98425 wifi: mac80211: don't warn when an IBSS has no channel to scan 1d
Unknown CVE-2026-98426 wifi: mwifiex: fix IRQ leak using wrong index in MSI-X error path 1d
Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 1d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-74671 is "ima: fix out-of-bounds read in xattr_verify()", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.18% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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