CVE-2025-38607: bpf: handle jset (if a & b ...) as a jump in CFG computation

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-08-19 · updated 2026-07-30

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: handle jset (if a & b ...) as a jump in CFG computation BPF_JSET is a conditional jump and currently verifier.c:can_jump() does not know about that. This can lead to incorrect live registers and SCC computation. E.g. in the following example: 1: r0 = 1; 2: r2 = 2; 3: if r1 & 0x7 goto +1; 4: exit; 5: r0 = r2; 6: exit; W/o this fix insn_successors(3) will return only (4), a jump to (5) would be missed and r2 won't be marked as alive at (3).

Affected products

Linux kernel: from 6.15 before 6.15.10; from 6.16 before 6.16.1 — fixed in 6.15.10, 6.16.1

How to fix

Upgrade to a fixed version: Linux kernel 6.15.10, 6.16.1. Check the vendor advisory for mitigations.

References

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