What’s Vulnerable › Vulnerabilities

CVE-2026-98383: bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL

• Severity: high (CVSS 7.8 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: 2026-10-09 · updated 2026-10-24

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL An LWT_SEG6LOCAL program can invalidate its cached SRH with bpf_lwt_seg6_adjust_srh() and then call bpf_skb_pull_data(). The latter may reallocate skb->head, leaving the per-CPU SRH pointer dangling. Post-program SRH validation then writes through that pointer. Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL programs so the verifier rejects this unsafe helper combination. Other LWT program types continue to expose the helper through lwt_out_func_proto().

Affected products

• Linux kernel: 4.18 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0f38472a2aa8704a6b514c0dfa9c32f3672b8f32
• https://git.kernel.org/stable/c/37b18688cd18fd86d2f35c212df1611862a26cd5
• https://git.kernel.org/stable/c/9f9e57b5a3a033f95f49ef9d541340cdbcb80abb
• https://git.kernel.org/stable/c/b9bb0e735460751b620156f800a4279a28573392
• https://git.kernel.org/stable/c/cae8674489f26edf7553fdd660599466cbb4c32f
• https://git.kernel.org/stable/c/df0072be6fc373cb22f9ea854d458b04e32a03cf
• https://git.kernel.org/stable/c/e4a62833adff6ef0fe7c0b90393204fe3c26b5c5
• https://git.kernel.org/stable/c/fca71ead7a20290af1e2046983eeafae43d21af1

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