CVE-2026-53091

Summary

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.

Affected Software

Weaknesses

ADP Enrichment

kernel: net: pull headers in qdisc_pkt_len_segs_init()

Additional References

• https://access.redhat.com/security/cve/CVE-2026-53091
• https://bugzilla.redhat.com/show_bug.cgi?id=2492270
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53091.json

References

• https://git.kernel.org/stable/c/9d4f5c68f5ad4ab425f3ce1500c97c9f9743999a
• https://git.kernel.org/stable/c/7fb4c19670110f052c04e1ec1d2b953b9f4f57e4

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