{"id":"CVE-2026-31638","summary":"rxrpc: Only put the call ref if one was acquired","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Only put the call ref if one was acquired\n\nrxrpc_input_packet_on_conn() can process a to-client packet after the\ncurrent client call on the channel has already been torn down.  In that\ncase chan-\u003ecall is NULL, rxrpc_try_get_call() returns NULL and there is\nno reference to drop.\n\nThe client-side implicit-end error path does not account for that and\nunconditionally calls rxrpc_put_call().  This turns a protocol error\npath into a kernel crash instead of rejecting the packet.\n\nOnly drop the call reference if one was actually acquired.  Keep the\nexisting protocol error handling unchanged.","modified":"2026-05-18T05:57:41.882517520Z","published":"2026-04-24T14:44:52.122Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31638.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0c156aff8a2d4fa0d61db7837641975cf0e5452d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6331f1b24a3e85465f6454e003a3e6c22005a5c5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8299ca146489664e3c0c90a3b8900d8335b1ede4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9fb09861e2b8d1abfe2efaf260c9f1d30080ea38"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b8f66447448d6c305a51413a67ec8ed26aa7d1dd"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31638.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31638"},{"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":"5e6ef4f1017c7f844e305283bbd8875af475e2fc"},{"fixed":"b8f66447448d6c305a51413a67ec8ed26aa7d1dd"},{"fixed":"0c156aff8a2d4fa0d61db7837641975cf0e5452d"},{"fixed":"8299ca146489664e3c0c90a3b8900d8335b1ede4"},{"fixed":"9fb09861e2b8d1abfe2efaf260c9f1d30080ea38"},{"fixed":"6331f1b24a3e85465f6454e003a3e6c22005a5c5"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31638.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.135"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.82"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.23"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31638.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}