Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e876f208af18b074f800656e4d1b99da75b2135f before 5895cfc76924a629c6eaa5e5f049de642860045f; affected e876f208af18b074f800656e4d1b99da75b2135f before 7564dc804d8289d2e5c6edb8173754051b71bff4; affected e876f208af18b074f800656e4d1b99da75b2135f before 9d4f5c68f5ad4ab425f3ce1500c97c9f9743999a; affected e876f208af18b074f800656e4d1b99da75b2135f before 7fb4c19670110f052c04e1ec1d2b953b9f4f57e4 |
| Linux / Linux | affected 3.16; unaffected 0 before 3.16; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 7.0.10 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
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
ADP enrichment
A flaw was found in the Linux kernel's handling of Generic Segmentation Offload (GSO) packet headers. This vulnerability occurs when the `qdisc_pkt_len_segs_init()` function does not properly pull headers into the expected memory location, which can lead to incorrect processing by network drivers. A remote attacker could exploit this by sending specially crafted malicious packets, potentially causing a denial of service (DoS) or other unexpected system behavior.
- 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
- https://access.redhat.com/errata/RHSA-2026:65334
- https://access.redhat.com/errata/RHSA-2026:67150
- https://access.redhat.com/errata/RHSA-2026:66325
- https://access.redhat.com/errata/RHSA-2026:66324
No English description supplied.
No references supplied.