net: pull headers in qdisc_pkt_len_segs_init()
CVE-2026-53091 · published 24 Jun 2026
How serious is it
- Severity: high, CVSS score 8.4 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-53091?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: e876f208af18b074f800656e4d1b99da75b2135f to < 5895cfc76924a629c6eaa5e5f049de642860045f, e876f208af18b074f800656e4d1b99da75b2135f to < 7564dc804d8289d2e5c6edb8173754051b71bff4, e876f208af18b074f800656e4d1b99da75b2135f to < 9d4f5c68f5ad4ab425f3ce1500c97c9f9743999a, e876f208af18b074f800656e4d1b99da75b2135f to < 7fb4c19670110f052c04e1ec1d2b953b9f4f57e4
- Linux Linux: 3.16
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/5895cfc76924a629c6eaa5e5f049de642860045f
- git.kernel.org/stable/c/7564dc804d8289d2e5c6edb8173754051b71bff4
- git.kernel.org/stable/c/9d4f5c68f5ad4ab425f3ce1500c97c9f9743999a
- git.kernel.org/stable/c/7fb4c19670110f052c04e1ec1d2b953b9f4f57e4
Merged from CVE List. Last updated 25 Oct 2026. All vulnerabilities · RSS · JSON