---
id: CVE-2026-93207
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry

  svcauth_gss_decode_credbody() writes the caller's
  rpc_gss_wire_cred field by field and assigns gc…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry

  svcauth_gss_decode_credbody() writes the caller's
  rpc_gss_wire_cred field by field and assigns gc…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= b0bc53470d1af01f62a0fe2d405cf56477804863 <
    56b29d62017c7dd1718d060dd5b3a2ce61095d0c
  - >-
    Linux >= b0bc53470d1af01f62a0fe2d405cf56477804863 <
    0e18641708eaa8bc3c1ff338cd844aeadbd52bac
  - >-
    Linux >= b0bc53470d1af01f62a0fe2d405cf56477804863 <
    e0778464049b0238f2915a40007a4154f86cf351
  - >-
    Linux >= b0bc53470d1af01f62a0fe2d405cf56477804863 <
    0fa8a8acae57e6373962741d5b06d13f44aba6a9
  - >-
    Linux >= b0bc53470d1af01f62a0fe2d405cf56477804863 <
    11539e8fcce0b0af062ae5fecf7b3676c2f7aeed
  - Linux 6.3
published: '2026-09-24'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T05:16:58.630'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93207'
references:
  - url: 'https://git.kernel.org/stable/c/0e18641708eaa8bc3c1ff338cd844aeadbd52bac'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0fa8a8acae57e6373962741d5b06d13f44aba6a9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/11539e8fcce0b0af062ae5fecf7b3676c2f7aeed'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/56b29d62017c7dd1718d060dd5b3a2ce61095d0c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e0778464049b0238f2915a40007a4154f86cf351'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93207.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-93207'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2540182'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-93207'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93207'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93207.mbox
  - url: 'https://access.redhat.com/errata/RHSA-2026:83207'
  - url: 'https://access.redhat.com/errata/RHSA-2026:83156'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
ingestedAt: '2026-09-24T15:45:56.673Z'
epss: 0.00467
epssPercentile: 0.40247
cwe:
  - CWE-825
scores:
  nvd: 9.8
  vendor: 7
  cna: 9.8
patched:
  - 10base_smtv
  - enterprise_linux_appstream_v_10
  - enterprise_linux_appstream_v_9
  - enterprise_linux_baseos_v_10
  - enterprise_linux_baseos_v_9
  - enterprise_linux_codeready_linux_builder_v_10
  - enterprise_linux_codeready_linux_builder_v_9
  - enterprise_linux_hidden_v_10
  - enterprise_linux_real_time_for_nfv_v_10
  - enterprise_linux_real_time_for_nfv_v_9
  - enterprise_linux_real_time_v_10
  - enterprise_linux_real_time_v_9
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry

svcauth_gss_decode_credbody() writes the caller's
rpc_gss_wire_cred field by field and assigns gc_ctx.len only on
the success tail.  The caller storage is svcdata->clcred, which
lives in the per-svc_rqst gss_svc_data and is reused across
requests.  Early decode failures leave partially decoded state
mixed with residue from the prior request.

The trailing body_len tightness check is the sharpest case:
xdr_stream_decode_opaque_inline() has already written gc_ctx.data
with a borrowed inline pointer into the current request's XDR
pages, but gc_ctx.len retains its prior value.  Once the request
pages are released the pooled clcred carries a dangling pointer
paired with a stale length.

Zero the caller's rpc_gss_wire_cred at function entry so that
every early-return path leaves a deterministic all-zero cred.
On the trailing tightness-check path, gc_ctx.len is now zero
instead of stale, which neuters length-driven consumers such as
gss_svc_searchbyctx() that would otherwise walk the dangling
data pointer.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat OpenShift Container Platform 4 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93207.json)
- **RHSA-2026:83207** · Red Hat · fixed in: 10Base-SMTV, Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Hidden (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), … · released 2026-10-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:83207)
- **RHSA-2026:83156** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9), Red Hat Enterprise Linux Real Time (v. 9) · released 2026-10-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:83156)