CVE-2026-31685

Advisory lineage Upstream: 0 Downstream: 86
Modified
Published: 25 Apr 2026, 08:47
Last modified:01 Jun 2026, 16:13

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.4 CRITICAL
v3.1 (cve.org)
EPSS Score
0.34% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

25 Apr 2026, 08:47
Published
Vulnerability first disclosed
01 Jun 2026, 16:13
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_eui64: reject invalid MAC header for all packets `eui64_mt6()` derives a modified EUI-64 from the Ethernet source address and compares it with the low 64 bits of the IPv6 source address. The existing guard only rejects an invalid MAC header when `par->fragoff != 0`. For packets with `par->fragoff == 0`, `eui64_mt6()` can still reach `eth_hdr(skb)` even when the MAC header is not valid. Fix this by removing the `par->fragoff != 0` condition so that packets with an invalid MAC header are rejected before accessing `eth_hdr(skb)`.

CVSS Metrics

  • v3.1•CRITICAL•Score: 9.4CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H

EPSS Trends

Current EPSS score: 0.34%• Percentile: 26%

Affected Systems

  • linux•linux

    ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 4d75bc2cd093bf5803edf512c099bfb220fd6459 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7d6a57411caf54df025860c9b1a82cd42d57a562 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < d5603591373441fecf9951833d6d873e09320f08 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 288138418bef956f8b295751a4536c60f0e89f4a | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 9eda5478746ef7dc0e4e537b5a5e4b0ca1027091 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 807d6ee15804df6f01a35c910f09612e858739a6 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 309ae3e9a51a69699ca94eac5fac5688fa562d55 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < fdce0b3590f724540795b874b4c8850c90e6b0a8 | 2.6.12

  • linux•linux kernel

    ≥ 2.6.12.1, < 6.6.136 | ≥ 6.7, < 6.12.83 | ≥ 6.13, < 6.18.24 | ≥ 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

References (8)