5.5

CVE-2026-43043: linux NULL Pointer Dereference

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-43043DEBIAN-CVE-2026-43043
Published 01-05-2026Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2026-43043 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.11% chance of exploitation in the next 30 days, higher than 1.4% 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
0.11%
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 42 · Related 40
MGASA-2026-0108MGASA-2026-0110OPENSUSE-SU-2026:21555-1SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1SUSE-SU-2026:23193-1

Timeline

  1. 01-05-2026
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: af-alg - fix NULL pointer dereference in scatterwalk The AF_ALG interface fails to unmark the end of a Scatter/Gather List (SGL) when chaining a new af_alg_tsgl structure. If a sendmsg() fills an SGL exactly to MAX_SGL_ENTS, the last entry is marked as the end. A subsequent sendmsg() allocates a new SGL and chains it, but fails to clear the end marker on the previous SGL's last data entry. This causes the crypto scatterwalk to hit a premature end, returning NULL on sg_next() and leading to a kernel panic during dereference. Fix this by explicitly unmarking the end of the previous SGL when performing sg_chain() in af_alg_alloc_tsgl().

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.11%

Chance of exploitation in the next 30 days

Percentile

1%

Versus all other CVEs

30-day change

0.00 pp

From 0.11% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.11%

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 | < 6.8.0-136.136
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1061.64
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 8ff590903d5fc7f5a0a988c38267a3d08e6393a2, < f48d3dd99199180cf37d6253550c55e86372309a | ≥ 8ff590903d5fc7f5a0a988c38267a3d08e6393a2, < f9acceae7b004956851fd4268edf9f518a9bce04 | ≥ 8ff590903d5fc7f5a0a988c38267a3d08e6393a2, < 7195350fb78538c25cd790d703f8f2c73ee0d395 | ≥ 8ff590903d5fc7f5a0a988c38267a3d08e6393a2, < 7cdf2c6381b21ab5ccf8116750d5582fcd6c0f49 | ≥ 8ff590903d5fc7f5a0a988c38267a3d08e6393a2, < 44eafa39363e8d5dfda6a8c6eb6b45458ed4b948 | ≥ 8ff590903d5fc7f5a0a988c38267a3d08e6393a2, < 00cbdec17c15d024a1c5002c7365df7624a18a75 | ≥ 8ff590903d5fc7f5a0a988c38267a3d08e6393a2, < 4b03ab0a587ec57eb7ddb5c115d84a42896f60f7 | ≥ 8ff590903d5fc7f5a0a988c38267a3d08e6393a2, < 62397b493e14107ae82d8b80938f293d95425bcb | 2.6.38
  • linux_kernel≥ 2.6.38, < 5.10.253 | ≥ 5.11, < 5.15.203 | ≥ 5.16, < 6.1.168 | ≥ 6.2, < 6.6.134 | ≥ 6.7, < 6.12.81 | ≥ 6.13, < 6.18.22 | ≥ 6.19, < 6.19.12 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.12-1

3 vendors · 160 products

References

39 links
Show all 39 references