---
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
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-24T15:45:56.673Z'
---

## 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.