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CVE-2026-98383

Linux: bpf: Disallow bpf_skb_pull_data() for LWT_SEG6LOCAL

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.16%Chance of exploitation activity in the next 30 days, higher than 5% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in0f38472a2aa8704a6b514c0dfa9c32f3672b8f32Also 9f9e57b5a3a033f95f49ef9d541340cdbcb80abb, 37b18688cd18fd86d2f35c212df1611862a26cd5CVE List
Published9 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 0f38472a2aa8704a6b514c0dfa9c32f3672b8f32LinuxCVE List
  • 9f9e57b5a3a033f95f49ef9d541340cdbcb80abbLinuxCVE List
  • 37b18688cd18fd86d2f35c212df1611862a26cd5LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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().

Text from CVE List

Affected versions 18

  • Linuxaffected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 before 0f38472a2aa8704a6b514c0dfa9c32f3672b8f32CVE List
  • Linuxaffected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 before cae8674489f26edf7553fdd660599466cbb4c32fCVE List
  • Linuxaffected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 before 9f9e57b5a3a033f95f49ef9d541340cdbcb80abbCVE List
  • Linuxaffected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 before df0072be6fc373cb22f9ea854d458b04e32a03cfCVE List
  • Linuxaffected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 before b9bb0e735460751b620156f800a4279a28573392CVE List
  • Linuxaffected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 before 37b18688cd18fd86d2f35c212df1611862a26cd5CVE List
  • Linuxaffected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 before fca71ead7a20290af1e2046983eeafae43d21af1CVE List
  • Linuxaffected: 004d4b274e2a1a895a0e5dc66158b90a7d463d44 before e4a62833adff6ef0fe7c0b90393204fe3c26b5c5CVE List
  • Linuxaffected: 4.18CVE List
  • Linuxunaffected: all versions before 4.18CVE List
  • Linuxunaffected: 5.10.271 through 5.10.*CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.112 through 6.12.*CVE List
  • Linuxunaffected: 6.18.55 through 6.18.*CVE List
  • Linuxunaffected: 7.2.9 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 8