SUNRPC: check rpc_sockaddr2uaddr() return value in rpcb_register_inet4/6
In 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
CVE-2026-89784
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89784
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "d77385f23830ee6c400569bac8b37e6eb3b7d360",
"lessThan": "04441b792ec40eb66349b5fab34b6a2090b5b2dd",
"versionType": "git"
},
{
"status": "affected",
"version": "d77385f23830ee6c400569bac8b37e6eb3b7d360",
"lessThan": "5a51c49ddb37b883566874aecc66bc5a2e617a96",
"versionType": "git"
},
{
"status": "affected",
"version": "d77385f23830ee6c400569bac8b37e6eb3b7d360",
"lessThan": "4a6095de8cb1858e05bdf70b3e7d6d7645c25041",
"versionType": "git"
},
{
"status": "affected",
"version": "d77385f23830ee6c400569bac8b37e6eb3b7d360",
"lessThan": "12bf3e0182ccdaf3b412756a756d3944a7dacaa9",
"versionType": "git"
},
{
"status": "affected",
"version": "d77385f23830ee6c400569bac8b37e6eb3b7d360",
"lessThan": "4e01022974355732e748ec8ebc97c558cb624ffe",
"versionType": "git"
},
{
"status": "affected",
"version": "d77385f23830ee6c400569bac8b37e6eb3b7d360",
"lessThan": "cda4aacfb0bbf5c0f90fd0b42c72c749635d1368",
"versionType": "git"
},
{
"status": "affected",
"version": "d77385f23830ee6c400569bac8b37e6eb3b7d360",
"lessThan": "eb476289c12cc22c8766f8a84eeb7ab46c4e8fb6",
"versionType": "git"
},
{
"status": "affected",
"version": "d77385f23830ee6c400569bac8b37e6eb3b7d360",
"lessThan": "fd22370226a0d8109045d0831fd5aaadee921693",
"versionType": "git"
}
],
"programFiles": [
"net/sunrpc/rpcb_clnt.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/sunrpc/rpcb_clnt.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89784
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #36254 · Revision 1
- Added to Heist Feed
- Publisher date