Answer in brief
CVE-2026-53391 records a High severity (CVSS 7.5) vulnerability in NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=6b7f3cf96364eaf597940cb5c68a682894829915 <76b94cbd32aacf36a641956385a852635c6802b9 || >=6b7f3cf96364eaf597940cb5c68a682894829915 <c8e4e0c701d0192a2efb6df059c0f9e19678c23d || >=6b7f3cf96364eaf597940cb5c68a682894829915 <6c344fff2feff9d4d716d8e4ad40e9b5040ee5ea || >=6b7f3cf96364eaf597940cb5c68a682894829915 <427ab81a811dab4bca9d19f82eec5847ae42646e || >=6b7f3cf96364eaf597940cb5c68a682894829915 <012d37a568bfbb2c9686f03ade75560bc7139956 || >=6b7f3cf96364eaf597940cb5c68a682894829915 <30aae62e50b4e074a90a9a5e15246548fbdc1182 || >=6b7f3cf96364eaf597940cb5c68a682894829915 <41fe0f7b84f0cb822ae10ab08592996a592b2a25 | 76b94cbd32aacf36a641956385a852635c6802b9, c8e4e0c701d0192a2efb6df059c0f9e19678c23d, 6c344fff2feff9d4d716d8e4ad40e9b5040ee5ea, 427ab81a811dab4bca9d19f82eec5847ae42646e, 012d37a568bfbb2c9686f03ade75560bc7139956, 30aae62e50b4e074a90a9a5e15246548fbdc1182, 41fe0f7b84f0cb822ae10ab08592996a592b2a25 |
| Linux/Linuxgeneric | 4.0 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.