nfsd: validate sockaddr length per family in listener_set

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89700
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:57 UTC
Updated2026-09-11 20:19:57 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nfsd: validate sockaddr length per family in listener_set nfsd_sock_nl_policy declares NFSD_A_SOCK_ADDR as a bare NLA_BINARY attribute with no minimum length. A CAP_NET_ADMIN caller can send a 16-byte NFSD_A_SOCK_ADDR with sa_family=AF_INET6, causing a 12-byte OOB read across three consumers (rpc_cmp_addr_port, svc_find_listener, kernel_bind). nfsd_nl_listener_set_doit() also parsed and validated each listener entry inline in two separate loops, interleaved with mutating the running listener configuration. The validation was duplicated, used an open-coded "nla_len < sizeof(struct sockaddr)" check that was too short for AF_INET6, and handled a malformed entry inconsistently depending on which loop noticed it. Add an nfsd_nl_validate_listeners() helper that walks the entire list once and confirms each entry parses, carries both an address and a transport name, and is long enough for its address family (sizeof(struct sockaddr_in) for AF_INET, sizeof(struct sockaddr_in6) for AF_INET6, -EAFNOSUPPORT otherwise). Call it before taking nfsd_mutex or creating the serv, so a malformed request fails cleanly with no side effects. Since every entry is known valid by the time the two existing loops run, drop the redundant presence and per-family length checks from both, leaving only the nla_parse_nested() call needed to extract the data.

Risk And Classification

EPSS: 0.001660000 probability, percentile 0.061350000 (date 2026-09-12)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 16a471177496c8e04a9793812c187a2c1a2192fa 2aca70c18c5f5d06004122861fb151d5fcc57faf git Not specified
CNA Linux Linux affected 16a471177496c8e04a9793812c187a2c1a2192fa 22d0e4752ca88fd84196d22ebeedc905e6540440 git Not specified
CNA Linux Linux affected 16a471177496c8e04a9793812c187a2c1a2192fa bdcc85c2b05a9378d8bd2d65f9fc41440a3cf464 git Not specified
CNA Linux Linux affected 6.10 Not specified
CNA Linux Linux unaffected 6.10 semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/22d0e4752ca88fd84196d22ebeedc905e6540440 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2aca70c18c5f5d06004122861fb151d5fcc57faf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bdcc85c2b05a9378d8bd2d65f9fc41440a3cf464 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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