{"id":"CVE-2026-89798","state":"PUBLISHED","title":"rpcrdma: arm rn_done before publishing the notification","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nrpcrdma: arm rn_done before publishing the notification\n\nrpcrdma_rn_register() inserts @rn into rd_xa with xa_alloc() before\nstoring the caller's callback in rn->rn_done. The xarray makes @rn\nreachable to rpcrdma_remove_one(), which walks rd_xa and invokes\nrn->rn_done(rn) for every registered notification. A device removal\nthat races a fresh registration can therefore observe @rn with\nrn_done still NULL, because the notification objects are zero\nallocated by their owners, and call through a NULL function pointer.\n\nStore rn->rn_done before xa_alloc() publishes @rn. The xarray's\nstore-side and load-side ordering then guarantees that any CPU which\nfinds @rn in rd_xa also observes the armed callback.\n\nrpcrdma_rn_unregister() treats a non-NULL rn_done as the sentinel\nfor a completed registration, so the early store must not survive a\nfailed registration. Clear rn_done again when xa_alloc() fails.\nWere it left set, the failed-accept cleanup path would call\nrpcrdma_rn_unregister() on an @rn that was never inserted, erasing\nan unrelated rd_xa slot and underflowing rd_kref.","publishedAt":"2026-09-16T10:30:29.930Z","updatedAt":"2026-10-19T08:52:52.994Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7e86845a0346efc95fddaa97ce5cd6a8bda8c71c","status":"affected","lessThan":"f9fe3cad43c42d874a388583552b39b411d886eb","versionType":"git"},{"version":"7e86845a0346efc95fddaa97ce5cd6a8bda8c71c","status":"affected","lessThan":"3c97b8e76ca2bba9e8770571413aed694068e78e","versionType":"git"},{"version":"7e86845a0346efc95fddaa97ce5cd6a8bda8c71c","status":"affected","lessThan":"ea0408273ccf5df1fb52d9a1b9db4d31600dcb36","versionType":"git"},{"version":"7e86845a0346efc95fddaa97ce5cd6a8bda8c71c","status":"affected","lessThan":"5b06f706374c37375bdff9d21cc10e61df925a92","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sunrpc/xprtrdma/ib_client.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.11","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sunrpc/xprtrdma/ib_client.c"]}],"references":["https://git.kernel.org/stable/c/f9fe3cad43c42d874a388583552b39b411d886eb","https://git.kernel.org/stable/c/3c97b8e76ca2bba9e8770571413aed694068e78e","https://git.kernel.org/stable/c/ea0408273ccf5df1fb52d9a1b9db4d31600dcb36","https://git.kernel.org/stable/c/5b06f706374c37375bdff9d21cc10e61df925a92"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89798.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89798","state":"PUBLISHED","datePublished":"2026-09-16T10:30:29.930Z","dateUpdated":"2026-10-19T08:52:52.994Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.767Z"},"containers":{"cna":{"title":"rpcrdma: arm rn_done before publishing the notification","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nrpcrdma: arm rn_done before publishing the notification\n\nrpcrdma_rn_register() inserts @rn into rd_xa with xa_alloc() before\nstoring the caller's callback in rn->rn_done. The xarray makes @rn\nreachable to rpcrdma_remove_one(), which walks rd_xa and invokes\nrn->rn_done(rn) for every registered notification. A device removal\nthat races a fresh registration can therefore observe @rn with\nrn_done still NULL, because the notification objects are zero\nallocated by their owners, and call through a NULL function pointer.\n\nStore rn->rn_done before xa_alloc() publishes @rn. The xarray's\nstore-side and load-side ordering then guarantees that any CPU which\nfinds @rn in rd_xa also observes the armed callback.\n\nrpcrdma_rn_unregister() treats a non-NULL rn_done as the sentinel\nfor a completed registration, so the early store must not survive a\nfailed registration. Clear rn_done again when xa_alloc() fails.\nWere it left set, the failed-accept cleanup path would call\nrpcrdma_rn_unregister() on an @rn that was never inserted, erasing\nan unrelated rd_xa slot and underflowing rd_kref."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"7e86845a0346efc95fddaa97ce5cd6a8bda8c71c","status":"affected","lessThan":"f9fe3cad43c42d874a388583552b39b411d886eb","versionType":"git"},{"version":"7e86845a0346efc95fddaa97ce5cd6a8bda8c71c","status":"affected","lessThan":"3c97b8e76ca2bba9e8770571413aed694068e78e","versionType":"git"},{"version":"7e86845a0346efc95fddaa97ce5cd6a8bda8c71c","status":"affected","lessThan":"ea0408273ccf5df1fb52d9a1b9db4d31600dcb36","versionType":"git"},{"version":"7e86845a0346efc95fddaa97ce5cd6a8bda8c71c","status":"affected","lessThan":"5b06f706374c37375bdff9d21cc10e61df925a92","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sunrpc/xprtrdma/ib_client.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.11","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sunrpc/xprtrdma/ib_client.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f9fe3cad43c42d874a388583552b39b411d886eb"},{"url":"https://git.kernel.org/stable/c/3c97b8e76ca2bba9e8770571413aed694068e78e"},{"url":"https://git.kernel.org/stable/c/ea0408273ccf5df1fb52d9a1b9db4d31600dcb36"},{"url":"https://git.kernel.org/stable/c/5b06f706374c37375bdff9d21cc10e61df925a92"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:52:52.994Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"6.18.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"7.2.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}