CVE-2026-53091
Published: June 25, 2026Last modified: June 25, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 8.4 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | CHANGED |
| Confidentiality | HIGH |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Vulnerable (6.1.175-r0) |
| 25 LTS | linux-lts | Vulnerable (6.12.92-r0) | |
| Stream | linux-lts | Vulnerable (6.18.35-r1) |
References
- https://access.redhat.com/security/cve/CVE-2026-53091
- https://bugzilla.redhat.com/show_bug.cgi?id=2492270
- https://git.kernel.org/stable/c/7fb4c19670110f052c04e1ec1d2b953b9f4f57e4
- https://git.kernel.org/stable/c/9d4f5c68f5ad4ab425f3ce1500c97c9f9743999a
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53091.json