NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr
In the Linux kernel, the following vulnerability has been resolved: NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr nfs4_decode_mp_ds_addr() decodes the r_netid and r_addr opaques of a netaddr4 from a GETDEVICEINFO multipath-DS body, then immediately calls strrchr(buf, '.') to locate the port separator. Both decodes use xdr_stream_decode_string_dup(), and the current code checks only "nlen < 0" / "rlen < 0" before dereferencing the returned string. When the on-wire opaque has length zero, xdr_stream_decode_opaque_inline() returns 0 and xdr_stream_decode_string_dup() falls through to its "*str = NULL; return ret" tail, leaving buf NULL with a return value of 0. The "< 0" check does not catch this, and the next line is strrchr(NULL, '.'), a kernel NULL pointer dereference reachable from any pNFS-flexfile client mounted against a malicious or compromised metadata server. Reject the zero-length cases explicitly so the decoder fails with -EBADMSG (treated as a malformed GETDEVICEINFO body) instead of panicking the client.
CVE-2026-53391
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-2026-53391
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": "6b7f3cf96364eaf597940cb5c68a682894829915",
"lessThan": "76b94cbd32aacf36a641956385a852635c6802b9",
"versionType": "git"
},
{
"status": "affected",
"version": "6b7f3cf96364eaf597940cb5c68a682894829915",
"lessThan": "c8e4e0c701d0192a2efb6df059c0f9e19678c23d",
"versionType": "git"
},
{
"status": "affected",
"version": "6b7f3cf96364eaf597940cb5c68a682894829915",
"lessThan": "6c344fff2feff9d4d716d8e4ad40e9b5040ee5ea",
"versionType": "git"
},
{
"status": "affected",
"version": "6b7f3cf96364eaf597940cb5c68a682894829915",
"lessThan": "427ab81a811dab4bca9d19f82eec5847ae42646e",
"versionType": "git"
},
{
"status": "affected",
"version": "6b7f3cf96364eaf597940cb5c68a682894829915",
"lessThan": "012d37a568bfbb2c9686f03ade75560bc7139956",
"versionType": "git"
},
{
"status": "affected",
"version": "6b7f3cf96364eaf597940cb5c68a682894829915",
"lessThan": "30aae62e50b4e074a90a9a5e15246548fbdc1182",
"versionType": "git"
},
{
"status": "affected",
"version": "6b7f3cf96364eaf597940cb5c68a682894829915",
"lessThan": "41fe0f7b84f0cb822ae10ab08592996a592b2a25",
"versionType": "git"
}
],
"programFiles": [
"fs/nfs/pnfs_nfs.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.0"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.211",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.177",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.144",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.95",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.38",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.3",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/nfs/pnfs_nfs.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-53391
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40820 · Revision 1
- Added to Heist Feed
- Publisher date