Linux Kernel GSO Header Pointer Misuse in qdisc_pkt_len_segs_init()
CVE-2026-53091 Published on June 24, 2026
net: pull headers in qdisc_pkt_len_segs_init()
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.
Products Associated with CVE-2026-53091
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Affected Versions
Linux:- Version e876f208af18b074f800656e4d1b99da75b2135f and below 9d4f5c68f5ad4ab425f3ce1500c97c9f9743999a is affected.
- Version e876f208af18b074f800656e4d1b99da75b2135f and below 7fb4c19670110f052c04e1ec1d2b953b9f4f57e4 is affected.
- Version 3.16 is affected.
- Before 3.16 is unaffected.
- Version 7.0.10, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.