CVE-2026-53004

Userspace data corruption via undersized SCTP buffer

Published Jun 24, 2026 · Updated Jun 24, 2026

Out-of-bounds write in the Linux Kernel SCTP stack allows local users to corrupt adjacent userspace data through a crafted getsockopt call. The sctp_getsockopt_peer_auth_chunks function validates len against only num_chunks, omitting the eight-byte sctp_authchunks header before copy_to_user writes chunk bytes at gauth_chunks. Reachability requires an unprivileged local process to create an SCTP association with AUTH enabled and supply the undersized buffer; the overwrite remains in that process's userspace rather than kernel memory.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in the Linux Kernel SCTP stack allows local users to corrupt adjacent userspace data through a crafted getsockopt call. The sctp_getsockopt_peer_auth_chunks function validates len against only num_chunks, omitting the eight-byte sctp_authchunks header before copy_to_user writes chunk bytes at gauth_chunks. Reachability requires an unprivileged local process to create an SCTP association with AUTH enabled and supply the undersized buffer; the overwrite remains in that process's userspace rather than kernel memory.

The record

CVE
CVE-2026-53004
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787
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=2.6.24
  2. Affected versionversion=65b07e5d0d09c77e98050b5f0146ead29e5add32 <0cf004ffb61cd32d140531c3a84afe975f9fc7ea
  3. Affected versionversion=65b07e5d0d09c77e98050b5f0146ead29e5add32 <2b5a2c957c7769d40110f725cf23987fcef50d75
  4. Affected versionversion=65b07e5d0d09c77e98050b5f0146ead29e5add32 <6849b995cda88a677bf08a05765d1db7905974fc
  5. Affected versionversion=65b07e5d0d09c77e98050b5f0146ead29e5add32 <6bcf8fe4ef7967b22b814cbae9a57bbd3c853410
  6. Affected versionversion=65b07e5d0d09c77e98050b5f0146ead29e5add32 <70a089cc9590aa347a61e84434116ab74619e3c3
  7. Affected versionversion=65b07e5d0d09c77e98050b5f0146ead29e5add32 <a132e199de69e2a45628aa8534df1bf5d44e1b6e
  8. Affected versionversion=65b07e5d0d09c77e98050b5f0146ead29e5add32 <d45c7e99caf915b0f6c716bd8ffe9d45b9685761
  9. Affected versionversion=65b07e5d0d09c77e98050b5f0146ead29e5add32 <d67fbc6dea5dbf7f46c618ebf65910a276078e20

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.24; version=65b07e5d0d09c77e98050b5f0146ead29e5add32 <0cf004ffb61cd32d140531c3a84afe975f9fc7ea; version=65b07e5d0d09c77e98050b5f0146ead29e5add32 <2b5a2c957c7769d40110f725cf23987fcef50d75; version=65b07e5d0d09c77e98050b5f0146ead29e5add32 <6849b995cda88a677bf08a05765d1db7905974fc; version=65b07e5d0d09c77e98050b5f0146ead29e5add32 <6bcf8fe4ef7967b22b814cbae9a57bbd3c853410; version=65b07e5d0d09c77e98050b5f0146ead29e5add32 <70a089cc9590aa347a61e84434116ab74619e3c3; version=65b07e5d0d09c77e98050b5f0146ead29e5add32 <a132e199de69e2a45628aa8534df1bf5d44e1b6e; version=65b07e5d0d09c77e98050b5f0146ead29e5add32 <d45c7e99caf915b0f6c716bd8ffe9d45b9685761; version=65b07e5d0d09c77e98050b5f0146ead29e5add32 <d67fbc6dea5dbf7f46c618ebf65910a276078e20

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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