5.5

CVE-2026-64425: linux

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2026-64425DEBIAN-CVE-2026-64425
Published 25-07-2026Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2026-64425 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.2% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.13%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 24 · Related 24
OPENSUSE-SU-2026:11476-1SUSE-SU-2026:24181-1SUSE-SU-2026:24182-1SUSE-SU-2026:4640-1SUSE-SU-2026:4706-1USN-8726-1

Timeline

  1. 25-07-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/io-wq: re-check IO_WQ_BIT_EXIT for each linked work item commit 10dc95939817 ("io_uring/io-wq: check IO_WQ_BIT_EXIT inside work run loop") fixed the obvious case where io_worker_handle_work() took one exit-bit snapshot before draining pending work, but the fix stops one level too early. io_worker_handle_work() now re-checks IO_WQ_BIT_EXIT in its outer work run loop, yet it still snapshots that bit once before processing a whole dependent linked-work chain. If io_wq_exit_start() sets IO_WQ_BIT_EXIT after the first linked item has started, the remaining linked items can still reuse stale do_kill = false, skip IO_WQ_WORK_CANCEL, and continue running after exit has begun. Move the check further inside, so it covers linked items too. Note: this is a syzbot special as it loves setting up tons of slow linked work on weird devices like msr that take forever to read, and immediately close the ring. Exit then takes a long time.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

0.00 pp

From 0.13% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.13%

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

No weakness data has been published for this record.

Affected systems

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-31.31
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 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)
Debian2 products
  • linux< 6.1.180-1 | < 6.12.96-1 | < 7.1.4-1
  • linux-6.12< 6.12.100-1~deb12u1
Linux2 products
  • linux≥ 065dd936195a3466b8ebe5f9287400987ee3c063, < 14b7ecad2ec56699325180a744f4b19f046401bb | ≥ 27e47500fac23d15b7dc93ff650bc4844d2581bd, < d179533c610e1b4c6aa436e3c1fd1b719d2c727c | ≥ d05d99573f81a091547b1778b9a50120f5d6c68a, < 6e2f51f3e06773c2ee98ad09738f0908b48f76f9 | ≥ 85eb83694a91c89d9abe615d717c0053c3efa714, < ea61b04e1d7242cb37f5ed2cc91cf21a493f6597 | ≥ 2e8ca1078b14142db2ce51cbd18ff9971560046b, < b6f179a653a934736c88d820fe0098c3c2532549 | ≥ bdf0bf73006ea8af9327cdb85cfdff4c23a5f966, < 1636d85dc139b07c0449308f2bb5e0c7a2e0da99 | ≥ 10dc959398175736e495f71c771f8641e1ca1907, < ab85765cbe3258b43dc6729af0e6ce3a87a133d8 | ≥ 10dc959398175736e495f71c771f8641e1ca1907, < 29bef9934b2521f787bb15dd1985d4c0d12ae02a | ≥ 5.10.253, < 5.10.261 | ≥ 5.15.203, < 5.15.212 | ≥ 6.1.167, < 6.1.178 | ≥ 6.6.122, < 6.6.145 | ≥ 6.12.68, < 6.12.96 | ≥ 6.18.8, < 6.18.39 | 6.19
  • linux_kernelEOL≥ 5.10.253, < 5.10.261 | ≥ 5.15.203, < 5.15.212 | ≥ 6.1.167, < 6.1.178 | ≥ 6.6.122, < 6.6.145 | ≥ 6.12.68, < 6.12.96 | ≥ 6.18.8, < 6.18.39 | ≥ 6.19.1, < 7.1.4 | 6.19 | 6.19:rc7 | 6.19:rc8

3 vendors · 161 products

References

34 links
Show all 34 references