7.8

CVE-2026-43366: linux Race Condition

CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2026-43366DEBIAN-CVE-2026-43366
Published 08-05-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-43366 is a high (CVSS 7.8) Race Condition vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 2.7% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.14%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 130 · Related 130
SUSE-SU-2026:21834-1SUSE-SU-2026:2195-1SUSE-SU-2026:2238-1SUSE-SU-2026:22598-1SUSE-SU-2026:22673-1SUSE-SU-2026:22674-1

Showing 100 of 130. Use Open JSON for the complete list.

Timeline

  1. 08-05-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: io_uring/kbuf: check if target buffer list is still legacy on recycle There's a gap between when the buffer was grabbed and when it potentially gets recycled, where if the list is empty, someone could've upgraded it to a ring provided type. This can happen if the request is forced via io-wq. The legacy recycling is missing checking if the buffer_list still exists, and if it's of the correct type. Add those checks.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

+0.01 pp

From 0.13% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.14%

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

Ubuntu130 products
  • linux< 6.8.0-136.136 | All versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 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≥ c7fb19428d67dd0a2a78a4f237af01d39c78dc5a, < a7b33671e418fca507feebd1d56e7f4952a4b25c | ≥ c7fb19428d67dd0a2a78a4f237af01d39c78dc5a, < 439a6728ec4641ffad1ca796622c19bc525e570f | ≥ c7fb19428d67dd0a2a78a4f237af01d39c78dc5a, < f3fb54e7a8b4aadcc2836ee463eec8c88709b8aa | ≥ c7fb19428d67dd0a2a78a4f237af01d39c78dc5a, < 50ad880db3013c6fee0ef13781762a39e2e7ef83 | ≥ c7fb19428d67dd0a2a78a4f237af01d39c78dc5a, < 97b57f69fee1b61b41acbf37e7720cac9d389fa4 | ≥ c7fb19428d67dd0a2a78a4f237af01d39c78dc5a, < c2c185be5c85d37215397c8e8781abf0a69bec1f | 5.19
  • linux_kernel≥ 5.19, < 6.1.167 | ≥ 6.2, < 6.6.130 | ≥ 6.7, < 6.12.78 | ≥ 6.13, < 6.18.19 | ≥ 6.19, < 6.19.9 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.10-1

3 vendors · 133 products

References

24 links
Show all 24 references