{"id":"CVE-2026-31532","summary":"can: raw: fix ro-\u003euniq use-after-free in raw_rcv()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncan: raw: fix ro-\u003euniq use-after-free in raw_rcv()\n\nraw_release() unregisters raw CAN receive filters via can_rx_unregister(),\nbut receiver deletion is deferred with call_rcu(). This leaves a window\nwhere raw_rcv() may still be running in an RCU read-side critical section\nafter raw_release() frees ro-\u003euniq, leading to a use-after-free of the\npercpu uniq storage.\n\nMove free_percpu(ro-\u003euniq) out of raw_release() and into a raw-specific\nsocket destructor. can_rx_unregister() takes an extra reference to the\nsocket and only drops it from the RCU callback, so freeing uniq from\nsk_destruct ensures the percpu area is not released until the relevant\ncallbacks have drained.\n\n[mkl: applied manually]","modified":"2026-05-13T03:51:33.164775469Z","published":"2026-04-23T11:12:44.829Z","related":["CGA-p424-g2xr-v5cg","openSUSE-SU-2026:10703-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31532.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1a0f2de81f7fbdc538fc72d7d74609b79bc83cc0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/34c1741254ff972e8375faf176678a248826fe3a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/572f0bf536ebc14f6e7da3d21a85cf076de8358e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5e9cfffad898bbeaafd0ea608a6d267362f050fc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7201a531b9a5ed892bfda5ded9194ef622de8ffa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a535a9217ca3f2fccedaafb2fddb4c48f27d36dc"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31532.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31532"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"514ac99c64b22d83b52dfee3b8becaa69a92bc4a"},{"fixed":"5e9cfffad898bbeaafd0ea608a6d267362f050fc"},{"fixed":"572f0bf536ebc14f6e7da3d21a85cf076de8358e"},{"fixed":"1a0f2de81f7fbdc538fc72d7d74609b79bc83cc0"},{"fixed":"7201a531b9a5ed892bfda5ded9194ef622de8ffa"},{"fixed":"34c1741254ff972e8375faf176678a248826fe3a"},{"fixed":"a535a9217ca3f2fccedaafb2fddb4c48f27d36dc"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31532.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.1.0"},{"fixed":"6.6.136"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.83"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.24"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.14"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.20.0"},{"fixed":"7.0.1"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31532.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}