CVE-2026-53091

Memory disclosure via unpulled GSO headers

Published Jun 24, 2026 · Updated Jun 24, 2026

Buffer handling in the Linux kernel before 7.0.10 allows local users to disclose kernel memory or crash the system via malformed GSO packets. qdisc_pkt_len_segs_init() inspects a non-linear GSO header with skb_header_pointer() but does not pull it into skb->head, leaving later transmit code to copy hdr_len bytes from insufficient linear data. Exploitation requires control of GSO metadata through a local path such as AF_PACKET, TUN/TAP, or guest virtio/tap injection; ordinary remote packets cannot supply that malformed kernel metadata.

CVSS severity8.4
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer handling in the Linux kernel before 7.0.10 allows local users to disclose kernel memory or crash the system via malformed GSO packets. qdisc_pkt_len_segs_init() inspects a non-linear GSO header with skb_header_pointer() but does not pull it into skb->head, leaving later transmit code to copy hdr_len bytes from insufficient linear data. Exploitation requires control of GSO metadata through a local path such as AF_PACKET, TUN/TAP, or guest virtio/tap injection; ordinary remote packets cannot supply that malformed kernel metadata.

The record

CVE
CVE-2026-53091
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-131
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.16
  2. Affected versionversion=e876f208af18b074f800656e4d1b99da75b2135f <7fb4c19670110f052c04e1ec1d2b953b9f4f57e4
  3. Affected versionversion=e876f208af18b074f800656e4d1b99da75b2135f <9d4f5c68f5ad4ab425f3ce1500c97c9f9743999a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.16; version=e876f208af18b074f800656e4d1b99da75b2135f <7fb4c19670110f052c04e1ec1d2b953b9f4f57e4; version=e876f208af18b074f800656e4d1b99da75b2135f <9d4f5c68f5ad4ab425f3ce1500c97c9f9743999a

Published CVSS scores

8.4kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H
7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-131Incorrect Calculation of Buffer Size

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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