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CVE-2026-64000: net: hsr: fix potential OOB access in supervision frame handling

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-19 · updated 2026-10-19
• Weakness: CWE-125

Description

In the Linux kernel, the following vulnerability has been resolved: net: hsr: fix potential OOB access in supervision frame handling Ensure the entire TLV header is linearized before access by adding sizeof(struct hsr_sup_tlv) to the pskb_may_pull() calls. Without this, a truncated frame could cause an out-of-bounds access.

Affected products

• Linux kernel: from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.93; from 6.13 before 6.18.35; from 6.19 before 7.0.12; 7.1-rc1, 7.1-rc2, 7.1-rc3, 7.1-rc4, 7.1-rc5 — fixed in 6.1.176, 6.12.93, 6.18.35, 6.6.143, 7.0.12

How to fix

Upgrade to a fixed version: Linux kernel 6.1.176, 6.12.93, 6.18.35, 6.6.143. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/09a37dca090c55ffb1a33f52d8667f1c2367ef48
• https://git.kernel.org/stable/c/71c986c0ba45b7dc574fae27c83e7b6671556f37
• https://git.kernel.org/stable/c/78607a6854a22a2502f68092202e75a39af4865d
• https://git.kernel.org/stable/c/a4b64f3e9c7b8259f7dd251a0313420ba7c01852
• https://git.kernel.org/stable/c/f229426072fc865654a60978bb7fda790a051ff3
• https://git.kernel.org/stable/c/fbd0662f9c9a66e8cc3df3099cca8ed6d3837cc7

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