GHSA-ph4x-4wh2-2qrmunknown
In the Linux kernel, the following vulnerability has been resolved: bpf: Disallow...
🔗 CVE IDs covered (1)
📋 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().
🔗 References (10)
- https://nvd.nist.gov/vuln/detail/CVE-2026-98383
- 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
- https://github.com/advisories/GHSA-ph4x-4wh2-2qrm