7.8

CVE-2026-31455: linux Use After Free

CVSS: 7.8v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-31455DEBIAN-CVE-2026-31455
Published 22-04-2026Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2026-31455 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.1% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.17%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 39 · Related 37
MGASA-2026-0108MGASA-2026-0110OPENSUSE-SU-2026:20965-1SUSE-SU-2026:22099-1SUSE-SU-2026:22108-1SUSE-SU-2026:22112-1

Timeline

  1. 22-04-2026
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: xfs: stop reclaim before pushing AIL during unmount The unmount sequence in xfs_unmount_flush_inodes() pushed the AIL while background reclaim and inodegc are still running. This is broken independently of any use-after-free issues - background reclaim and inodegc should not be running while the AIL is being pushed during unmount, as inodegc can dirty and insert inodes into the AIL during the flush, and background reclaim can race to abort and free dirty inodes. Reorder xfs_unmount_flush_inodes() to stop inodegc and cancel background reclaim before pushing the AIL. Stop inodegc before cancelling m_reclaim_work because the inodegc worker can re-queue m_reclaim_work via xfs_inodegc_set_reclaimable.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

+0.04 pp

From 0.13% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.17%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu145 products
  • linux< 5.15.0-186.196 | < 6.8.0-136.136 | All versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1112.119 | < 6.8.0-1061.64 | All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 90c60e16401248a4900f3f9387f563d0178dcf34, < e6cc490048f78b009259a5f032acead9f789c34c | ≥ 90c60e16401248a4900f3f9387f563d0178dcf34, < 239d734c00644072862fa833805c4471573b1445 | ≥ 90c60e16401248a4900f3f9387f563d0178dcf34, < bda27fc0b4eb3a425d9a18475c4cb94fbe862c60 | ≥ 90c60e16401248a4900f3f9387f563d0178dcf34, < d38135af04a3ad8a585c899d176efc8e97853115 | ≥ 90c60e16401248a4900f3f9387f563d0178dcf34, < a89434a6188d8430ea31120da96e3e4cefb58686 | ≥ 90c60e16401248a4900f3f9387f563d0178dcf34, < 8147e304d7d32fd5c3e943babc296ce2873dc279 | ≥ 90c60e16401248a4900f3f9387f563d0178dcf34, < 558e3275d8a3b101be18a7fe7d1634053e9d9b07 | ≥ 90c60e16401248a4900f3f9387f563d0178dcf34, < 4f24a767e3d64a5f58c595b5c29b6063a201f1e3 | 5.9
  • linux_kernel≥ 5.9, < 5.10.253 | ≥ 5.11, < 5.15.203 | ≥ 5.16, < 6.1.168 | ≥ 6.2, < 6.6.131 | ≥ 6.7, < 6.12.80 | ≥ 6.13, < 6.18.21 | ≥ 6.19, < 6.19.11 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc7
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.11-1

3 vendors · 148 products

References

39 links
Show all 39 references