CVE-2026-93207Network attack vector

Kernel use-after-free via stale RPCSEC_GSS credential

Published Sep 24, 2026 · Updated Sep 24, 2026

Use-after-free in Linux 6.3 allows remote attackers to trigger stale kernel-memory access via a malformed RPCSEC_GSS credential. svcauth_gss_decode_credbody() stores a borrowed request-page pointer before validating body length but leaves gc_ctx.len from the prior pooled request on failure. Exposure requires server-side RPCSEC_GSS and request reuse; published material does not establish a crash, disclosure, or code execution.

CVSS severityUnavailable
Unscored
EPSS probability0.47%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux 6.3 allows remote attackers to trigger stale kernel-memory access via a malformed RPCSEC_GSS credential. svcauth_gss_decode_credbody() stores a borrowed request-page pointer before validating body length but leaves gc_ctx.len from the prior pooled request on failure. Exposure requires server-side RPCSEC_GSS and request reuse; published material does not establish a crash, disclosure, or code execution.

The record

CVE
CVE-2026-93207
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 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=6.3
  2. Affected versionversion=b0bc53470d1af01f62a0fe2d405cf56477804863 <0e18641708eaa8bc3c1ff338cd844aeadbd52bac
  3. Affected versionversion=b0bc53470d1af01f62a0fe2d405cf56477804863 <0fa8a8acae57e6373962741d5b06d13f44aba6a9
  4. Affected versionversion=b0bc53470d1af01f62a0fe2d405cf56477804863 <11539e8fcce0b0af062ae5fecf7b3676c2f7aeed
  5. Affected versionversion=b0bc53470d1af01f62a0fe2d405cf56477804863 <56b29d62017c7dd1718d060dd5b3a2ce61095d0c
  6. Affected versionversion=b0bc53470d1af01f62a0fe2d405cf56477804863 <e0778464049b0238f2915a40007a4154f86cf351

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.3; version=b0bc53470d1af01f62a0fe2d405cf56477804863 <0e18641708eaa8bc3c1ff338cd844aeadbd52bac; version=b0bc53470d1af01f62a0fe2d405cf56477804863 <0fa8a8acae57e6373962741d5b06d13f44aba6a9; version=b0bc53470d1af01f62a0fe2d405cf56477804863 <11539e8fcce0b0af062ae5fecf7b3676c2f7aeed; version=b0bc53470d1af01f62a0fe2d405cf56477804863 <56b29d62017c7dd1718d060dd5b3a2ce61095d0c; version=b0bc53470d1af01f62a0fe2d405cf56477804863 <e0778464049b0238f2915a40007a4154f86cf351

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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