SUNRPC: fix gssx_dec_option_array error path bugs
In the Linux kernel, the following vulnerability has been resolved: SUNRPC: fix gssx_dec_option_array error path bugs Four coupled defects in the gssx XDR option-array decoder make the error paths unsafe: a NULL deref in the caller, a refcount leak on the decoded group_info, and a latent use-after-free that the leak fix would otherwise expose. gssx_dec_option_array() sets oa->count = 1 before allocating oa->data. If that allocation fails, -ENOMEM is returned with oa->count == 1 and oa->data == NULL. All other error paths jump to free_oa: which frees oa->data and NULLs it but also leaves oa->count == 1. The caller trusts the count: gssp_accept_sec_context_upcall() gssx_dec_accept_sec_context() gssx_dec_option_array() /* fails, count=1 data=NULL */ data = res.options.data[0].value /* NULL deref */ Independently, free_creds: releases the partially decoded svc_cred with a bare kfree(creds). gssx_dec_linux_creds() installs a groups_alloc() result into creds->cr_group_info; that object is kvmalloc-backed and refcounted, and only put_group_info() reaches kvfree(). A plain kfree(creds) drops the wrapper and leaks the group_info allocation. The natural fix for the leak is to call free_svc_cred(creds) before kfree(creds), but free_svc_cred() invokes put_group_info() on creds->cr_group_info unconditionally when non-NULL. The existing out_free_groups: path in gssx_dec_linux_creds() already called groups_free() on that pointer without clearing it, so once free_svc_cred() is wired in, the
CVE-2026-89544
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89544
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5e6013ae2c8d420faea553d363935f65badd32c3",
"lessThan": "8c56a46db3b7523f13e167c3e2c6e3c47a87dcb3",
"versionType": "git"
},
{
"status": "affected",
"version": "3cfcfc102a5e57b021b786a755a38935e357797d",
"lessThan": "fb30241f7ccace372ee83017891549f23a715581",
"versionType": "git"
},
{
"status": "affected",
"version": "3cfcfc102a5e57b021b786a755a38935e357797d",
"lessThan": "3ff45361e9469e85c0f86b8e7b82c63e50bab8ef",
"versionType": "git"
},
{
"status": "affected",
"version": "3cfcfc102a5e57b021b786a755a38935e357797d",
"lessThan": "f85a83774d7f4e2ac71c0c384df0dfb6f7d0179a",
"versionType": "git"
},
{
"status": "affected",
"version": "3cfcfc102a5e57b021b786a755a38935e357797d",
"lessThan": "5e9a94539b1ec17a89177d952badfd0d844d694a",
"versionType": "git"
},
{
"status": "affected",
"version": "b97c37978ca825557d331c9012e0c1ddc0e42364",
"versionType": "git"
},
{
"status": "affected",
"version": "bfa9d86d39a0fe4685f90c3529aa9bd62a9d97a8",
"versionType": "git"
},
{
"status": "affected",
"version": "bb336cd8d5ecb69c430ebe3e7bcff68471d93fa8",
"versionType": "git"
},
{
"status": "affected",
"version": "dd292e884c649f9b1c18af0ec75ca90b390cd044",
"versionType": "git"
},
{
"status": "affected",
"version": "934212a623cbab851848b6de377eb476718c3e4c",
"versionType": "git"
},
{
"status": "affected",
"version": "9806c2393cd2ab0a8e7bb9ffae02ce20e3112ec4",
"versionType": "git"
},
{
"status": "affected",
"version": "996997d1fb2126feda550d6adcedcbd94911fc69",
"versionType": "git"
},
{
"status": "affected",
"version": "6.6.23",
"lessThan": "6.6.160",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.19.311",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.4.273",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.10.214",
"lessThan": "5.11",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.153",
"lessThan": "5.16",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.83",
"lessThan": "6.2",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.7.11",
"lessThan": "6.8",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.8.2",
"lessThan": "6.9",
"versionType": "semver"
}
],
"programFiles": [
"net/sunrpc/auth_gss/gss_rpc_xdr.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/sunrpc/auth_gss/gss_rpc_xdr.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89544
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #46677 · Revision 1
- Added to Heist Feed
- Publisher date