CVE-2026-53091

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.

CVSS v3 8.4 HIGH

8.4^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.0 / Impact : 5.8

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://git.kernel.org/stable/c/5895cfc76924a629c6eaa5e5f049de642860045f
https://git.kernel.org/stable/c/7564dc804d8289d2e5c6edb8173754051b71bff4
https://git.kernel.org/stable/c/7fb4c19670110f052c04e1ec1d2b953b9f4f57e4	Patch
https://git.kernel.org/stable/c/9d4f5c68f5ad4ab425f3ce1500c97c9f9743999a	Patch
https://access.redhat.com/errata/RHSA-2026:65334
https://access.redhat.com/errata/RHSA-2026:66324
https://access.redhat.com/errata/RHSA-2026:66325
https://access.redhat.com/errata/RHSA-2026:67150
https://access.redhat.com/security/cve/CVE-2026-53091	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2492270	Third Party Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53091.json	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

History

21 Oct 2026, 13:19

Type	Values Removed	Values Added
References		() https://git.kernel.org/stable/c/5895cfc76924a629c6eaa5e5f049de642860045f - () https://git.kernel.org/stable/c/7564dc804d8289d2e5c6edb8173754051b71bff4 -

Information

Published : 2026-06-24 17:17

Updated : 2026-10-21 13:19

NVD link : CVE-2026-53091

Mitre link : CVE-2026-53091

CVE.ORG link : CVE-2026-53091

JSON object : View

Products Affected

linux

linux_kernel

CWE

NVD-CWE-noinfo CWE-131

Incorrect Calculation of Buffer Size

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Advisory"], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-131"}]}, {"type": "Secondary", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "description": [{"lang": "en", "value": "CWE-131"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: pull headers in qdisc_pkt_len_segs_init()\n\nMost ndo_start_xmit() methods expects headers of gso packets\nto be already in skb->head.\n\nnet/core/tso.c users are particularly at risk, because tso_build_hdr()\ndoes a memcpy(hdr, skb->data, hdr_len);\n\nqdisc_pkt_len_segs_init() already does a dissection of gso packets.\n\nUse pskb_may_pull() instead of skb_header_pointer() to make\nsure drivers do not have to reimplement this.\n\nSome malicious packets could be fed, detect them so that we can\ndrop them sooner with a new SKB_DROP_REASON_SKB_BAD_GSO drop_reason."}], "lastModified": "2026-10-21T13:19:09.800", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E2C6A818-C9E6-462A-988B-159B56775726", "versionEndExcluding": "7.0.10", "versionStartIncluding": "3.16"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}