CVE-2025-40363: linux

CVSS: UnknownDeferred
AliasesUBUNTU-CVE-2025-40363DEBIAN-CVE-2025-40363
Published 16-12-2025Last modified 16-06-2026
Open JSON

Vulnerability summary

CVE-2025-40363 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 10.8% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.21%
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 41 · Related 38
DLA-4436-1MGASA-2026-0017MGASA-2026-0018OPENSUSE-SU-2026:20287-1SUSE-SU-2026:0447-1SUSE-SU-2026:0472-1

Timeline

  1. 16-12-2025
    PublishedVulnerability first disclosed.
  2. 16-06-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: fix field-spanning memcpy warning in AH output Fix field-spanning memcpy warnings in ah6_output() and ah6_output_done() where extension headers are copied to/from IPv6 address fields, triggering fortify-string warnings about writes beyond the 16-byte address fields. memcpy: detected field-spanning write (size 40) of single field "&top_iph->saddr" at net/ipv6/ah6.c:439 (size 16) WARNING: CPU: 0 PID: 8838 at net/ipv6/ah6.c:439 ah6_output+0xe7e/0x14e0 net/ipv6/ah6.c:439 The warnings are false positives as the extension headers are intentionally placed after the IPv6 header in memory. Fix by properly copying addresses and extension headers separately, and introduce helper functions to avoid code duplication.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.21%

Chance of exploitation in the next 30 days

Percentile

11%

Versus all other CVEs

30-day change

0.00 pp

From 0.21% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.21%

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) | < 5.15.0-173.183 | < 6.8.0-106.106 | < 6.17.0-14.14
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1103.110 | < 6.8.0-1050.53 | < 6.17.0-1007.7
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.159-1 | < 6.12.63-1 | < 6.17.8-1
Linux1 product
  • linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 2da805a61ef5272a2773775ce14c3650adb84248 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 9bf27de51bd6db5ff827780ec0eba55de230ba45 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 0bf756ae1e69fec5e6332c37830488315d6d771b | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 75b16b2755e12999ad850756ddfb88ad4bfc7186 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f28dde240160f3c48a50d641d210ed6a3b9596ed | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < c14cf41094136691c92ef756872570645d61f4a1 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < b056f971bd72b373b7ae2025a8f3bd18f69653d3 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 2327a3d6f65ce2fe2634546dde4a25ef52296fec | 2.6.12

3 vendors · 156 products

References

37 links
Show all 37 references