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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 27f3924061592d0ef6b04e16f48754b6cb6adf27, 5ff232d31106f45ac87c3b64e1d35a0667777797, 7e515b6c9aab452a4f0734bd7208e4e780e164ca; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 27f3924061592d0ef6b04e16f48754b6cb6adf27, 5ff232d31106f45ac87c3b64e1d35a0667777797, 7e515b6c9aab452a4f0734bd7208e4e780e164ca; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Aug 22, 2026
Updated
Oct 14, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.13affected
    • 3ea7a56067e663278470c04fd655adf809e72d4d and later · before d823b5f4557083d1dd92096f796a78a2b1b06d10affected · git
    • 3ea7a56067e663278470c04fd655adf809e72d4d and later · before caeb105c15ea2431fa8da7ecfa242d0c68272426affected · git
    • 3ea7a56067e663278470c04fd655adf809e72d4d and later · before a784b4732ac7e51862b9b210c2d8b2ab9e83568caffected · git
    • 3ea7a56067e663278470c04fd655adf809e72d4d and later · before b6cb134707a2127d90a58d69dd818679cae8033caffected · git
    • 3ea7a56067e663278470c04fd655adf809e72d4d and later · before 7e515b6c9aab452a4f0734bd7208e4e780e164caaffected · git
    • 3ea7a56067e663278470c04fd655adf809e72d4d and later · before 27f3924061592d0ef6b04e16f48754b6cb6adf27affected · git
    • 3ea7a56067e663278470c04fd655adf809e72d4d and later · before dd04114af0d451091f7b8cbd26d9e37d011e9131affected · git
    • 3ea7a56067e663278470c04fd655adf809e72d4d and later · before 5ff232d31106f45ac87c3b64e1d35a0667777797affected · git
    • before 3.13not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.107-1~deb12u16.12.107-1~deb12u1
Debian:13linuxbefore 6.12.105-16.12.105-1
Debian:14linuxbefore 7.1.9-17.1.9-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-74669Aug 22, 2026 · ipvs: clear IPv4 options after rebasing tunnel ICMP errors
    39Monitor
  • ← EarlierCVE-2026-74670Aug 22, 2026 · ipvs: stop estimator after disabled calc phase
    31Monitor
  • Later →CVE-2026-74672Aug 22, 2026 · mm/vmalloc: acquire init_mm lock on huge vmap to avoid ptdump UAF
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux27f3924061592d0ef6b04e16f48754b6cb6adf27Vendor (CNA)
Linux Linux5ff232d31106f45ac87c3b64e1d35a0667777797Vendor (CNA)
Linux Linux7e515b6c9aab452a4f0734bd7208e4e780e164caVendor (CNA)
Linux Linuxa784b4732ac7e51862b9b210c2d8b2ab9e83568cVendor (CNA)
Linux Linuxb6cb134707a2127d90a58d69dd818679cae8033cVendor (CNA)
Linux Linuxcaeb105c15ea2431fa8da7ecfa242d0c68272426Vendor (CNA)
Linux Linuxd823b5f4557083d1dd92096f796a78a2b1b06d10Vendor (CNA)
Linux Linuxdd04114af0d451091f7b8cbd26d9e37d011e9131Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.06.6.152.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records