SUNRPC: check rpc_sockaddr2uaddr() return value in rpcb_register_inet4/6

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89784
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 09:17:09 UTC
Updated2026-09-16 09:17:09 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: SUNRPC: check rpc_sockaddr2uaddr() return value in rpcb_register_inet4/6 rpcb_register_inet4() and rpcb_register_inet6() store the result of rpc_sockaddr2uaddr() into map->r_addr without checking it for NULL. rpc_sockaddr2uaddr() returns NULL when its final kstrdup() fails, and the unchecked NULL is then carried into the synchronous RPCBPROC_SET encode path: rpcb_register_call() -> rpc_call_sync() -> rpcb_enc_getaddr() -> encode_rpcb_string(), whose first statement is strlen(string), dereferencing NULL and oopsing the kernel. The crash reproduces under failslab on v6.12; with KASAN the NULL dereference surfaces as a fault on the shadow of address zero: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000 [#1] PREEMPT SMP KASAN RIP: 0010:strlen (lib/string.c:409) Call Trace: encode_rpcb_string (net/sunrpc/rpcb_clnt.c:890) rpcb_enc_getaddr (net/sunrpc/rpcb_clnt.c:910) rpcauth_wrap_req_encode (net/sunrpc/auth.c:745) call_encode (net/sunrpc/clnt.c:1966) __rpc_execute (net/sunrpc/sched.c:952) rpc_run_task (net/sunrpc/clnt.c:1243) rpc_call_sync (net/sunrpc/clnt.c:1272) rpcb_v4_register (net/sunrpc/rpcb_clnt.c:500) svc_generic_rpcbind_set nfsd_rpcbind_set svc_register svc_setup_socket svc_addsock write_ports nfsctl_transaction_write vfs_write The crash is reachable when an in-kernel RPC service (nfsd, lockd, nfs-callback) registers with the local rpcbind under enough memory pressure for the small GFP_KERNEL kstrdup() in rpc_sockaddr2uaddr() to fail. The asynchronous getport path already handles this exact failure mode by returning -ENOMEM; only the two register helpers omit the check. Mirror that handling: bail out with -ENOMEM when rpc_sockaddr2uaddr() returns NULL, before the address is fed into the encoder.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d77385f23830ee6c400569bac8b37e6eb3b7d360 04441b792ec40eb66349b5fab34b6a2090b5b2dd git Not specified
CNA Linux Linux affected d77385f23830ee6c400569bac8b37e6eb3b7d360 5a51c49ddb37b883566874aecc66bc5a2e617a96 git Not specified
CNA Linux Linux affected d77385f23830ee6c400569bac8b37e6eb3b7d360 4a6095de8cb1858e05bdf70b3e7d6d7645c25041 git Not specified
CNA Linux Linux affected d77385f23830ee6c400569bac8b37e6eb3b7d360 12bf3e0182ccdaf3b412756a756d3944a7dacaa9 git Not specified
CNA Linux Linux affected d77385f23830ee6c400569bac8b37e6eb3b7d360 4e01022974355732e748ec8ebc97c558cb624ffe git Not specified
CNA Linux Linux affected d77385f23830ee6c400569bac8b37e6eb3b7d360 cda4aacfb0bbf5c0f90fd0b42c72c749635d1368 git Not specified
CNA Linux Linux affected d77385f23830ee6c400569bac8b37e6eb3b7d360 eb476289c12cc22c8766f8a84eeb7ab46c4e8fb6 git Not specified
CNA Linux Linux affected d77385f23830ee6c400569bac8b37e6eb3b7d360 fd22370226a0d8109045d0831fd5aaadee921693 git Not specified
CNA Linux Linux affected 3.2 Not specified
CNA Linux Linux unaffected 3.2 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 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/cda4aacfb0bbf5c0f90fd0b42c72c749635d1368 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5a51c49ddb37b883566874aecc66bc5a2e617a96 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4e01022974355732e748ec8ebc97c558cb624ffe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/12bf3e0182ccdaf3b412756a756d3944a7dacaa9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eb476289c12cc22c8766f8a84eeb7ab46c4e8fb6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/04441b792ec40eb66349b5fab34b6a2090b5b2dd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4a6095de8cb1858e05bdf70b3e7d6d7645c25041 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fd22370226a0d8109045d0831fd5aaadee921693 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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