SUNRPC: Zero rpc_gss_wire_cred at svcauth_gss_decode_credbody() entry
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.
CVE-2026-93207
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-2026-93207
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": "b0bc53470d1af01f62a0fe2d405cf56477804863",
"lessThan": "56b29d62017c7dd1718d060dd5b3a2ce61095d0c",
"versionType": "git"
},
{
"status": "affected",
"version": "b0bc53470d1af01f62a0fe2d405cf56477804863",
"lessThan": "0e18641708eaa8bc3c1ff338cd844aeadbd52bac",
"versionType": "git"
},
{
"status": "affected",
"version": "b0bc53470d1af01f62a0fe2d405cf56477804863",
"lessThan": "e0778464049b0238f2915a40007a4154f86cf351",
"versionType": "git"
},
{
"status": "affected",
"version": "b0bc53470d1af01f62a0fe2d405cf56477804863",
"lessThan": "0fa8a8acae57e6373962741d5b06d13f44aba6a9",
"versionType": "git"
},
{
"status": "affected",
"version": "b0bc53470d1af01f62a0fe2d405cf56477804863",
"lessThan": "11539e8fcce0b0af062ae5fecf7b3676c2f7aeed",
"versionType": "git"
}
],
"programFiles": [
"net/sunrpc/auth_gss/svcauth_gss.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.3"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"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/svcauth_gss.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93207
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #37910 · Revision 1
- Added to Heist Feed
- Publisher date