7.6

CVE-2026-43350: linux

CVSS: 7.6v3.1HighModified
AliasesUBUNTU-CVE-2026-43350DEBIAN-CVE-2026-43350
Published 08-05-2026Last modified 16-10-2026
Open JSON

Vulnerability summary

CVE-2026-43350 is a high (CVSS 7.6) vulnerability in linux. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 16.4% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.6/10
010
High · v3.1 (CVE.org)
EPSS score
0.26%
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 26 · Related 26
OPENSUSE-SU-2026:10793-1USN-8488-1USN-8488-2USN-8507-1USN-8567-1USN-8569-1

Timeline

  1. 08-05-2026
    PublishedVulnerability first disclosed.
  2. 16-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: require a full NFS mode SID before reading mode bits parse_dacl() treats an ACE SID matching sid_unix_NFS_mode as an NFS mode SID and reads sid.sub_auth[2] to recover the mode bits. That assumes the ACE carries three subauthorities, but compare_sids() only compares min(a, b) subauthorities. A malicious server can return an ACE with num_subauth = 2 and sub_auth[] = {88, 3}, which still matches sid_unix_NFS_mode and then drives the sub_auth[2] read four bytes past the end of the ACE. Require num_subauth >= 3 before treating the ACE as an NFS mode SID. This keeps the fix local to the special-SID mode path without changing compare_sids() semantics for the rest of cifsacl.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

+0.04 pp

From 0.22% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.26%

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

Ubuntu154 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-136.136 | < 7.0.0-27.27
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1061.64 | < 7.0.0-1008.8
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ e2f8fbfb8d09c06decde162090fac3ee220aa280, < 23b54d6cc3ef30a51d984dc74364f24039ae2ecb | ≥ e2f8fbfb8d09c06decde162090fac3ee220aa280, < 1592a6cd6f653f2d24572a6976c7a775b19f4940 | ≥ e2f8fbfb8d09c06decde162090fac3ee220aa280, < 8bd4cad3f458d11650d51c2d24b03fb1770ae6cc | ≥ e2f8fbfb8d09c06decde162090fac3ee220aa280, < b53b8e98c23310294fc45fc686db5ee860311896 | ≥ e2f8fbfb8d09c06decde162090fac3ee220aa280, < c8eef12af1cc73031639ea7cf16e0b10e2536b0b | ≥ e2f8fbfb8d09c06decde162090fac3ee220aa280, < 38a69f08ee82c450d3e4168707fff2e317dc3ff7 | ≥ e2f8fbfb8d09c06decde162090fac3ee220aa280, < f8488c07bea2431ee12a6067d736578064fa46b4 | ≥ e2f8fbfb8d09c06decde162090fac3ee220aa280, < 2757ad3e4b6f9e0fed4c7739594e702abc5cab21 | 5.4
  • linux_kernel≥ 5.4, < 6.6.136 | ≥ 6.7, < 6.12.84 | ≥ 6.13, < 6.18.25 | ≥ 6.19, < 7.0.2
Debian1 product
  • linux< 6.1.176-1 | < 6.12.85-1 | < 7.0.3-1

3 vendors · 157 products

References

38 links
Show all 38 references