CVE-2026-89702Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: nfsd: size fh_verify server sockaddr slot by xpt_locallen The nfsd_fh_verify and nfsd_fh_verify_err tracepoints declare the server sockaddr slot sized by xpt_remotelen…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
9.8 → 7
critical → high
7 → 9.8
high → critical
9.8 → 7
critical → high
0.2% → 0.7%
7 → 9.8
high → critical
Last analysed / modified upstream
9.8 → 7.5
critical → high
7.5 → 9.8
high → critical
In the Linux kernel, the following vulnerability has been resolved:
nfsd: size fh_verify server sockaddr slot by xpt_locallen
The nfsd_fh_verify and nfsd_fh_verify_err tracepoints declare the server sockaddr slot sized by xpt_remotelen but fill it from xpt_local using xpt_locallen:
TP_STRUCT__entry(
...
__sockaddr(server, rqstp->rq_xprt->xpt_remotelen)
...
)
TP_fast_assign(
...
__assign_sockaddr(server, &rqstp->rq_xprt->xpt_local,
rqstp->rq_xprt->xpt_locallen);
...
)
When xpt_locallen exceeds xpt_remotelen, __assign_sockaddr's memcpy writes past the reserved ring-buffer slot. In the reverse direction (xpt_locallen < xpt_remotelen) the slot is oversized and the unwritten tail leaks prior ring-buffer contents to trace consumers.
The write-past-end case is reachable on NFS/UDP. svc_xprt_set_remote() is only called from svc_tcp_accept() (net/sunrpc/svcsock.c) and from the RDMA connect path; svc_create_socket() for UDP calls only svc_xprt_set_local(), so xpt_remotelen stays 0 for the xprt's lifetime. Every fh_verify trace for an NFSv2/v3-over-UDP request then copies 16 or 28 bytes from xpt_local into a zero-byte slot.
The other NFSD tracepoints that record the server address (NFSD_TRACE_PROC_CALL_FIELDS, NFSD_TRACE_PROC_RES_FIELDS, SVC_RQST_ENDPOINT_FIELDS) already size the server slot by xpt_locallen; nfsd_fh_verify and nfsd_fh_verify_err were the only exceptions.
Fix by sizing the server slot with xpt_locallen so the declared slot matches the copy length. The client slot and its assignment already agree on xpt_remotelen and are left untouched.
Linux >= 051382885552e12541cc0ebf82092be374a9ed2a < 1c6a4d6c20fd42552ffc2c3dfaed2139c9477ee5Linux >= 051382885552e12541cc0ebf82092be374a9ed2a < 95d064f9828a20ccca5ae90a17be3e2076f25272Linux >= 051382885552e12541cc0ebf82092be374a9ed2a < 7ff8d6363cffff45654ea85e319f7c0c54226012Linux >= 051382885552e12541cc0ebf82092be374a9ed2a < 719a10e3f5f868c3c4ac3cf3648c5775d12034bdLinux >= 051382885552e12541cc0ebf82092be374a9ed2a < 71d068490098b1d23c63b2345e40675d3a1ca763Linux dcbebc86850324fbe0a993ce352f0539cd98038aLinux 62980365d6e894234b29f44fb2bfad4f7f8bb824Linux >= 5.15.154 < 5.16Linux 6.0Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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