5.5

CVE-2026-43109: linux

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2026-43109DEBIAN-CVE-2026-43109CGA-3wx8-6jpf-4h9r
Published 06-05-2026Last modified 17-05-2026
Open JSON

Vulnerability summary

CVE-2026-43109 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% 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
0.16%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 143 · Related 144
OPENSUSE-SU-2026:20965-1SUSE-SU-2026:22099-1SUSE-SU-2026:22108-1SUSE-SU-2026:22112-1SUSE-SU-2026:22117-1SUSE-SU-2026:22127-1

Showing 100 of 144. Use Open JSON for the complete list.

Timeline

  1. 06-05-2026
    PublishedVulnerability first disclosed.
  2. 17-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: x86: shadow stacks: proper error handling for mmap lock 김영민 reports that shstk_pop_sigframe() doesn't check for errors from mmap_read_lock_killable(), which is a silly oversight, and also shows that we haven't marked those functions with "__must_check", which would have immediately caught it. So let's fix both issues.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

+0.05 pp

From 0.11% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.16%

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) | < 6.8.0-136.136
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1061.64
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Chainguard11 products
  • linux-aws-6.12All versions (No fix recorded)
  • linux-aws-6.18< 6.18.31-r0
  • linux-azure-6.12All versions (No fix recorded)
  • linux-azure-6.18< 6.18.31-r0
  • linux-gcp-6.12All versions (No fix recorded)
Linux2 products
  • linux≥ 7fad2a432cd35bbf104d2d9d426e74902f22aa95, < c79cf42321600e931933e11f94aba8b245d4cd66 | ≥ 7fad2a432cd35bbf104d2d9d426e74902f22aa95, < 1a30468eff661937d978495644d2e5ebfeef5ce6 | ≥ 7fad2a432cd35bbf104d2d9d426e74902f22aa95, < c64cebcc5c4f223dbcbe7dcdf74908fc092a0aa4 | ≥ 7fad2a432cd35bbf104d2d9d426e74902f22aa95, < 262b6d38a81d51b135db81e1f30c13d30e38feee | ≥ 7fad2a432cd35bbf104d2d9d426e74902f22aa95, < 52f657e34d7b21b47434d9d8b26fa7f6778b63a0 | 6.6
  • linux_kernel≥ 6.6, < 6.18.24 | ≥ 6.19, < 6.19.14 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6 | 7.0:rc7
Debian1 product
  • linux< 6.12.88-1 | < 6.19.14-1

4 vendors · 171 products

References

23 links
Show all 23 references