7.5

CVE-2026-43296: linux Improper Locking

CVSS: 7.5v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-43296DEBIAN-CVE-2026-43296
Published 08-05-2026Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2026-43296 is a high (CVSS 7.5) Improper Locking vulnerability in linux. EPSS estimates a 0.55% chance of exploitation in the next 30 days, higher than 45.3% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.55%
0%100%
Low · +0.17 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 37 · Related 37
OPENSUSE-SU-2026:21555-1SUSE-SU-2026:22108-1SUSE-SU-2026:22137-1SUSE-SU-2026:22433-1SUSE-SU-2026:22458-1SUSE-SU-2026:23066-1

Timeline

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

Description

In the Linux kernel, the following vulnerability has been resolved: octeontx2-af: Workaround SQM/PSE stalls by disabling sticky NIX SQ manager sticky mode is known to cause stalls when multiple SQs share an SMQ and transmit concurrently. Additionally, PSE may deadlock on transitions between sticky and non-sticky transmissions. There is also a credit drop issue observed when certain condition clocks are gated. work around these hardware errata by: - Disabling SQM sticky operation: - Clear TM6 (bit 15) - Clear TM11 (bit 14) - Disabling sticky → non-sticky transition path that can deadlock PSE: - Clear TM5 (bit 23) - Preventing credit drops by keeping the control-flow clock enabled: - Set TM9 (bit 21) These changes are applied via NIX_AF_SQM_DBG_CTL_STATUS. With this configuration the SQM/PSE maintain forward progress under load without credit loss, at the cost of disabling sticky optimizations.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.55%

Chance of exploitation in the next 30 days

Percentile

45%

Versus all other CVEs

30-day change

+0.17 pp

From 0.39% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.55%

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

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-134.134
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1060.63
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 5d9b976d4480dc0dcfa3719b645636d2f0f9f156, < 9a3fd301329474f449e75f86d8a4f6b9c603fd6c | ≥ 5d9b976d4480dc0dcfa3719b645636d2f0f9f156, < d0b3c8a80336029d9356f429151eb27922d80a3c | ≥ 5d9b976d4480dc0dcfa3719b645636d2f0f9f156, < 36cc5a5e0178d5fb79e04173b8aa623b0108819a | ≥ 5d9b976d4480dc0dcfa3719b645636d2f0f9f156, < d9b549b6951ba178ec14339a031cae65f4e43fe1 | ≥ 5d9b976d4480dc0dcfa3719b645636d2f0f9f156, < cec2ceb35ce7bc874c43812bb39200d6cf691b87 | ≥ 5d9b976d4480dc0dcfa3719b645636d2f0f9f156, < 8052d0587fb14b85539c3a14a226586c0c3d6b4c | ≥ 5d9b976d4480dc0dcfa3719b645636d2f0f9f156, < b7eba260a34e854e2487b8363c11976f082df00d | ≥ 5d9b976d4480dc0dcfa3719b645636d2f0f9f156, < 70e9a5760abfb6338d63994d4de6b0778ec795d6 | 5.5
  • linux_kernel≥ 5.5, < 5.10.252 | ≥ 5.11, < 5.15.202 | ≥ 5.16, < 6.1.165 | ≥ 6.2, < 6.6.128 | ≥ 6.7, < 6.12.75 | ≥ 6.13, < 6.18.16 | ≥ 6.19, < 6.19.6
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.6-1

3 vendors · 160 products

References

37 links
Show all 37 references