7.8

CVE-2026-23223: xfs: fix UAF in xchk_btree_check_block_owner

Analyzed
AliasesUBUNTU-CVE-2026-23223DEBIAN-CVE-2026-23223
Published 18-02-2026Last modified 11-05-2026

Vulnerability summary

CVE-2026-23223 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.14%
0%100%
Low · +0.01 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 6 · Related 5
DSA-6141-1OPENSUSE-SU-2026:10387-1OPENSUSE-SU-2026:20416-1SUSE-SU-2026:20838-1SUSE-SU-2026:20873-1SUSE-SU-2026:20931-1

Timeline

  1. 18-02-2026
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: xfs: fix UAF in xchk_btree_check_block_owner We cannot dereference bs->cur when trying to determine if bs->cur aliases bs->sc->sa.{bno,rmap}_cur after the latter has been freed. Fix this by sampling before type before any freeing could happen. The correct temporal ordering was broken when we removed xfs_btnum_t.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.13% 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

Affected systems

Version check

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

Ubuntu107 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ ec793e690f801d97a7ae2a0d429fea1fee4d44aa, < 1d411278dda293a507cb794db7d9ed3511c685c6 | ≥ ec793e690f801d97a7ae2a0d429fea1fee4d44aa, < ed82e7949f5cac3058f4100f3cd670531d41a266 | ≥ ec793e690f801d97a7ae2a0d429fea1fee4d44aa, < ba5264610423d9653aa36920520902d83841bcfd | ≥ ec793e690f801d97a7ae2a0d429fea1fee4d44aa, < 1c253e11225bc5167217897885b85093e17c2217 | 6.9
  • linux_kernel≥ 6.9, < 6.12.72 | ≥ 6.13, < 6.18.11 | ≥ 6.19, < 6.19.1
Debian1 product
  • linux< 6.12.73-1 | < 6.18.12-1

3 vendors · 110 products

References

7 links