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CVE-2024-43838: bpf: fix overflow check in adjust_jmp_off()

• 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: 2024-08-17 · updated 2026-06-17
• Weakness: CWE-190

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: fix overflow check in adjust_jmp_off() adjust_jmp_off() incorrectly used the insn->imm field for all overflow check, which is incorrect as that should only be done or the BPF_JMP32 | BPF_JA case, not the general jump instruction case. Fix it by using insn->off for overflow check in the general case.

Affected products

• Linux kernel: from 6.9.8 before 6.10; from 6.10 before 6.10.3 — fixed in 6.10, 6.10.3

How to fix

Upgrade to a fixed version: Linux kernel 6.10, 6.10.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/345652866a8869825a2a582ee5a28d75141f184a
• https://git.kernel.org/stable/c/4a04b4f0de59dd5c621e78f15803ee0b0544eeb8

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