{"id":"CVE-2026-89548","title":"SUNRPC: always drain cache_cleaner before destroying a cache_detail","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: always drain cache_cleaner before destroying a cache_detail\n\nsunrpc_destroy_cache_detail() only cancels the global cache_cleaner\ndelayed_work when cache_list is…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-825"],"vendor":"Linux","product":"Linux","affected":["Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < dec787a15c96a5665e9ffc61b429a6a4ab26e6b9","Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < 5eea874a696201c31e7c2d7badbfa0d90e9961b5","Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < cf239de7fdcc8336259b01ea4bcf650dadad1040","Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < 6d74ecc2be120a0c300b224b7649fe93c0453714","Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < 9d44836f60c8c29bcdb1471fd9202387c642a890","Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < 2e861ce2aaa468351a6a47c4cbb4971ebb740c7b","Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < 3d60fdf951143d6ef4e352e2f8eb852286701726","Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < f42d0fda0c67695db6bc704b04b7c10240805377","Linux 3.4"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T19:23:39.938577Z"},"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:48:41.057Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89548","references":[{"url":"https://git.kernel.org/stable/c/dec787a15c96a5665e9ffc61b429a6a4ab26e6b9"},{"url":"https://git.kernel.org/stable/c/5eea874a696201c31e7c2d7badbfa0d90e9961b5"},{"url":"https://git.kernel.org/stable/c/cf239de7fdcc8336259b01ea4bcf650dadad1040"},{"url":"https://git.kernel.org/stable/c/6d74ecc2be120a0c300b224b7649fe93c0453714"},{"url":"https://git.kernel.org/stable/c/9d44836f60c8c29bcdb1471fd9202387c642a890"},{"url":"https://git.kernel.org/stable/c/2e861ce2aaa468351a6a47c4cbb4971ebb740c7b"},{"url":"https://git.kernel.org/stable/c/3d60fdf951143d6ef4e352e2f8eb852286701726"},{"url":"https://git.kernel.org/stable/c/f42d0fda0c67695db6bc704b04b7c10240805377"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89548.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89548"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532450"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89548"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89548"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89548.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00126,"epssPercentile":0.02231,"scores":{"cna":7.8,"vendor":7},"ingestedAt":"2026-09-14T15:23:07.452Z","slug":"CVE-2026-89548","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: always drain cache_cleaner before destroying a cache_detail\n\nsunrpc_destroy_cache_detail() only cancels the global cache_cleaner\ndelayed_work when cache_list is empty.  During per-netns teardown\ncache_list is never empty because init_net's caches remain registered,\nso the cancel never fires.  After unlink, the caller proceeds to\ncache_destroy_net() which kfrees the cache_detail while cache_clean()\nmay still hold a dangling pointer to it.  The result is a\nuse-after-free: cache_dequeue() takes cd->queue_lock on freed memory,\nand cache_put() dereferences cd->cache_put as a function pointer from\nfreed slab.\n\nDrop the list_empty guard so that cancel_delayed_work_sync() always\nruns, ensuring any in-flight cache_clean() completes before the\ncache_detail is freed.  Re-arm the cleaner afterwards if other caches\nare still registered.\n\n## Affected\n\n- `Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < dec787a15c96a5665e9ffc61b429a6a4ab26e6b9`\n- `Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < 5eea874a696201c31e7c2d7badbfa0d90e9961b5`\n- `Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < cf239de7fdcc8336259b01ea4bcf650dadad1040`\n- `Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < 6d74ecc2be120a0c300b224b7649fe93c0453714`\n- `Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < 9d44836f60c8c29bcdb1471fd9202387c642a890`\n- `Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < 2e861ce2aaa468351a6a47c4cbb4971ebb740c7b`\n- `Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < 3d60fdf951143d6ef4e352e2f8eb852286701726`\n- `Linux >= 820f9442e711a81749e70c40f149fc54c4ce0ca8 < f42d0fda0c67695db6bc704b04b7c10240805377`\n- `Linux 3.4`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89548.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":223288,"id":"CVE-2026-89548","ts":1792180045690,"field":"cvss","old":"7","new":"7.8"},{"seq":203862,"id":"CVE-2026-89548","ts":1789490210261,"field":"cvss","old":"7.8","new":"7"},{"seq":197939,"id":"CVE-2026-89548","ts":1789384321048,"field":"cvss","old":"6.4","new":"7.8"},{"seq":197938,"id":"CVE-2026-89548","ts":1789384321048,"field":"severity","old":"medium","new":"high"},{"seq":183746,"id":"CVE-2026-89548","ts":1789356677214,"field":"cvss","old":"7.8","new":"6.4"},{"seq":183745,"id":"CVE-2026-89548","ts":1789356677214,"field":"severity","old":"high","new":"medium"},{"seq":153352,"id":"CVE-2026-89548","ts":1789285350163,"field":"cvss","old":null,"new":"7.8"},{"seq":153351,"id":"CVE-2026-89548","ts":1789285350163,"field":"severity","old":"none","new":"high"},{"seq":147193,"id":"CVE-2026-89548","ts":1789270200248,"field":"cvss","old":null,"new":"6.4"},{"seq":147192,"id":"CVE-2026-89548","ts":1789270200248,"field":"severity","old":"none","new":"medium"},{"seq":108948,"id":"CVE-2026-89548","ts":1789183729694,"field":"cvss","old":null,"new":"6.4"},{"seq":108947,"id":"CVE-2026-89548","ts":1789183729694,"field":"severity","old":"none","new":"medium"}]}