5.5

CVE-2026-43088: net: af_key: zero aligned sockaddr tail in PF_KEY exports

Modified
AliasesUBUNTU-CVE-2026-43088DEBIAN-CVE-2026-43088
Published 06-05-2026Last modified 14-09-2026

Vulnerability summary

CVE-2026-43088 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.12% chance of exploitation in the next 30 days, higher than 2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.12%
0%100%
Low · -0.04 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 19 · Related 19
SUSE-SU-2026:21834-1SUSE-SU-2026:2238-1USN-8567-1USN-8574-1USN-8574-2USN-8574-3

Timeline

  1. 06-05-2026
    PublishedVulnerability first disclosed.
  2. 14-09-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: net: af_key: zero aligned sockaddr tail in PF_KEY exports PF_KEY export paths use `pfkey_sockaddr_size()` when reserving sockaddr payload space, so IPv6 addresses occupy 32 bytes on the wire. However, `pfkey_sockaddr_fill()` initializes only the first 28 bytes of `struct sockaddr_in6`, leaving the final 4 aligned bytes uninitialized. Not every PF_KEY message is affected. The state and policy dump builders already zero the whole message buffer before filling the sockaddr payloads. Keep the fix to the export paths that still append aligned sockaddr payloads with plain `skb_put()`: - `SADB_ACQUIRE` - `SADB_X_NAT_T_NEW_MAPPING` - `SADB_X_MIGRATE` Fix those paths by clearing only the aligned sockaddr tail after `pfkey_sockaddr_fill()`.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.12%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

Decrease -0.04 pp

From 0.16% on 06-10-2026

06-10-202605-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 5.15.0-202.212 | < 6.8.0-136.136
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1119.126 | < 6.8.0-1061.64
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 6df5f90175fe4c584e9960b6c00131a7bf2b5399 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 746ee79d9e140f0e9e56f5123eaa88ad9332de7b | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e357c3cf8a44d4ec1f49ad6981e4ab9704354347 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 3c19cb8a84ef709d57943bd6664cf31cb91ba6ec | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 11cbf294bac623bd57296f231199193087f57b4a | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < edd446ee7cd3d02cac246168063d5b3e9ea68460 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 2e74f974359b5382ecbe8536abbb5b837eb6c724 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 426c355742f02cf743b347d9d7dbdc1bfbfa31ef | 2.6.12
  • linux_kernel≥ 2.6.12.1, < 6.12.88 | ≥ 6.13, < 6.18.30 | ≥ 6.19, < 6.19.14 | 2.6.12 | 2.6.12:rc2 | 2.6.12:rc3 | 2.6.12:rc4 | 2.6.12:rc5 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6 | 7.0:rc7
Debian1 product
  • linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.88-1 | < 6.19.14-1

3 vendors · 160 products

References

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