nfsd: widen nfsd_genl_rqstp address fields to sockaddr_storage

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89698
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:56 UTC
Updated2026-09-11 20:19:56 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: nfsd: widen nfsd_genl_rqstp address fields to sockaddr_storage struct nfsd_genl_rqstp declares rq_daddr and rq_saddr as plain "struct sockaddr" (16 bytes). When an IPv6 NFS client is connected, nfsd_genl_rpc_status_compose_msg() casts these fields to "struct sockaddr_in6 *" (28 bytes) and reads sin6_addr at offset 8..24, which extends 8 bytes past the end of the 16-byte sockaddr field into the adjacent rq_flags member. The 16-byte nla_put_in6_addr then ships 8 bytes of truncated IPv6 address followed by 8 bytes of rq_flags to userspace via the NFSD_A_RPC_STATUS_SADDR6/DADDR6 netlink attributes. This is reachable by any unprivileged process in the network namespace because NFSD_CMD_RPC_STATUS_GET uses GENL_CMD_CAP_DUMP without GENL_ADMIN_PERM. Fix by widening rq_daddr and rq_saddr to struct sockaddr_storage so the IPv6 casts operate within bounds, copying sizeof(struct sockaddr_storage) bytes in the memcpy calls so the full address is captured, and zero-initializing the genl_rqstp stack variable to prevent leaking uninitialized tail bytes through netlink.

Risk And Classification

EPSS: 0.001980000 probability, percentile 0.096790000 (date 2026-09-13)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bd9d6a3efa9709e653aafbeb859289feccb8e70c 03c512f22d3fbe7a3767d6df5e3d88b8e7c105e5 git Not specified
CNA Linux Linux affected bd9d6a3efa9709e653aafbeb859289feccb8e70c dcb69ad0dafb4a24b825183bb94055d5be8a10bd git Not specified
CNA Linux Linux affected bd9d6a3efa9709e653aafbeb859289feccb8e70c a99d720ed2a5258564e5e9d5f39f3184a030d354 git Not specified
CNA Linux Linux affected 6.7 Not specified
CNA Linux Linux unaffected 6.7 semver Not specified
CNA Linux Linux unaffected 6.18.51 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/03c512f22d3fbe7a3767d6df5e3d88b8e7c105e5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dcb69ad0dafb4a24b825183bb94055d5be8a10bd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a99d720ed2a5258564e5e9d5f39f3184a030d354 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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