CVE-2026-53091 Details
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.
A vulnerability has been identified in the Linux kernel's handling of Generic Segmentation Offload (GSO) packets within the networking subsystem. This issue arises because certain functions expect the headers of GSO packets to be properly aligned in the socket buffer's head. The vulnerability is particularly relevant for users of the TSO (TCP Segmentation Offload) feature, as the current implementation can inadvertently allow malicious packets to be processed incorrectly. The vulnerability affects the Linux kernel stable tree.
Users can upgrade to the latest version of the Linux kernel stable tree, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://access.redhat.com/errata/RHSA-2026:65334 | redhat-SADP | |
| https://access.redhat.com/errata/RHSA-2026:66324 | redhat-SADP | |
| https://access.redhat.com/errata/RHSA-2026:66325 | redhat-SADP | |
| https://access.redhat.com/errata/RHSA-2026:67150 | redhat-SADP | |
| https://access.redhat.com/security/cve/CVE-2026-53091 | redhat-SADP | Third Party Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=2492270 | redhat-SADP | Third Party Advisory |
| https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53091.json | redhat-SADP | Third Party Advisory |
| https://git.kernel.org/stable/c/7fb4c19670110f052c04e1ec1d2b953b9f4f57e4 | kernel.org | Patch |
| https://git.kernel.org/stable/c/9d4f5c68f5ad4ab425f3ce1500c97c9f9743999a | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
| CWE-131 | Incorrect Calculation of Buffer Size | redhat-SADP |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 3.16, < 7.0.10 |
CPE
Remediation
| |
Change History
9 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 14, 2026 | CVE Modified | redhat-SADP |
| Sep 10, 2026 | CVE Modified | redhat-SADP |
| Sep 9, 2026 | CVE Modified | kernel.org |
| Sep 9, 2026 | CVE Modified | redhat-SADP |
| Jul 23, 2026 | Initial Analysis | [email protected] |
| Jul 15, 2026 | CVE Modified | redhat-SADP |
| Jun 30, 2026 | CVE Modified | redhat-SADP |
| Jun 28, 2026 | CVE Modified | kernel.org |
| Jun 24, 2026 | New CVE Received | kernel.org |