CVE-2026-98383
Last modified
CVE-2026-98383 is a vulnerability of currently unknown severity. 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.
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 Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 004d4b274e2a1a895a0e5dc66158b90a7d463d44, < 0f38472a2aa8704a6b514c0dfa9c32f3672b8f32; >= 004d4b274e2a1a895a0e5dc66158b90a7d463d44, < cae8674489f26edf7553fdd660599466cbb4c32f; >= 004d4b274e2a1a895a0e5dc66158b90a7d463d44, < 9f9e57b5a3a033f95f49ef9d541340cdbcb80abb; >= 004d4b274e2a1a895a0e5dc66158b90a7d463d44, < df0072be6fc373cb22f9ea854d458b04e32a03cf; >= 004d4b274e2a1a895a0e5dc66158b90a7d463d44, < b9bb0e735460751b620156f800a4279a28573392; >= 004d4b274e2a1a895a0e5dc66158b90a7d463d44, < 37b18688cd18fd86d2f35c212df1611862a26cd5; >= 004d4b274e2a1a895a0e5dc66158b90a7d463d44, < fca71ead7a20290af1e2046983eeafae43d21af1; >= 004d4b274e2a1a895a0e5dc66158b90a7d463d44, < e4a62833adff6ef0fe7c0b90393204fe3c26b5c5 |
| Linux | Linux | 4.18 |
References
Timeline
- Published
- Last Modified
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