Vulnerability in Linux

[ Description ]Official 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().

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund8 Oct 2026WID-SEC-2026-3822

  Linux Kernel: Multiple vulnerabilities allow an unspecified attack Translated from German

  CVE-2026-98380CVE-2026-98376CVE-2026-98381+7 more CVEs

[ References ]References

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