5.5

CVE-2026-64256: xfs: don't wrap around quota ids in dqiterate

Analyzed
AliasesUBUNTU-CVE-2026-64256DEBIAN-CVE-2026-64256CGA-hfwm-vc79-r43w
Published 25-07-2026Last modified 17-08-2026

Vulnerability summary

CVE-2026-64256 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5.1% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.16%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 19 · Related 20
OPENSUSE-SU-2026:11476-1OPENSUSE-SU-2026:21910-1SUSE-SU-2026:23881-1SUSE-SU-2026:23887-1SUSE-SU-2026:23897-1SUSE-SU-2026:23902-1

Timeline

  1. 25-07-2026
    PublishedVulnerability first disclosed.
  2. 17-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: xfs: don't wrap around quota ids in dqiterate LOLLM noticed that q_id is an unsigned 32-bit variable. If it happens to be set to XFS_DQ_ID_MAX due to a filesystem that actually has a dquot for ID_MAX, then this addition will truncate to zero and the iteration starts over. Fix this by casting to u64.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.16% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu142 products
  • linuxAll versions (No fix recorded) | < 6.8.0-147.147 | < 7.0.0-31.31
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1067.70 | < 7.0.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Chainguard2 products
  • linux-gcp-6.18< 6.18.44-r0
  • linux-gcp-6.18-bootc< 6.18.44-r0
Debian2 products
  • linux< 6.12.96-1 | < 7.1.4-1
  • linux-6.12< 6.12.100-1~deb12u1
Linux2 products
  • linux≥ 21d7500929c8a0b10e22a6755850c6f9a9280284, < 249e311c2ba392ceaf9ebfc145a46922946f069a | ≥ 21d7500929c8a0b10e22a6755850c6f9a9280284, < d1c4c40599c376aeb0c93068a2ae344e79ee4b90 | ≥ 21d7500929c8a0b10e22a6755850c6f9a9280284, < 2b14fe1e0924c6b901f4256456342569c5397abe | ≥ 21d7500929c8a0b10e22a6755850c6f9a9280284, < d766e4e5e85d829629c3ba503802fe1303d7b591 | 6.8
  • linux_kernel≥ 6.8, < 6.12.96 | ≥ 6.13, < 6.18.39 | ≥ 6.19, < 7.1.4 | 7.2:rc1 | 7.2:rc2 | 7.2:rc3

4 vendors · 148 products

References

21 links
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