{"id":"CVE-2026-31638","title":"rxrpc: Only put the call ref if one was acquired","summary":"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 b…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 5e6ef4f1017c7f844e305283bbd8875af475e2fc < b8f66447448d6c305a51413a67ec8ed26aa7d1dd","Linux >= 5e6ef4f1017c7f844e305283bbd8875af475e2fc < 0c156aff8a2d4fa0d61db7837641975cf0e5452d","Linux >= 5e6ef4f1017c7f844e305283bbd8875af475e2fc < 8299ca146489664e3c0c90a3b8900d8335b1ede4","Linux >= 5e6ef4f1017c7f844e305283bbd8875af475e2fc < 9fb09861e2b8d1abfe2efaf260c9f1d30080ea38","Linux >= 5e6ef4f1017c7f844e305283bbd8875af475e2fc < 6331f1b24a3e85465f6454e003a3e6c22005a5c5","Linux 6.2"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-16T15:11:27.061889Z"},"published":"2026-04-24","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:20:18.015Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31638","references":[{"url":"https://git.kernel.org/stable/c/b8f66447448d6c305a51413a67ec8ed26aa7d1dd"},{"url":"https://git.kernel.org/stable/c/0c156aff8a2d4fa0d61db7837641975cf0e5452d"},{"url":"https://git.kernel.org/stable/c/8299ca146489664e3c0c90a3b8900d8335b1ede4"},{"url":"https://git.kernel.org/stable/c/9fb09861e2b8d1abfe2efaf260c9f1d30080ea38"},{"url":"https://git.kernel.org/stable/c/6331f1b24a3e85465f6454e003a3e6c22005a5c5"}],"tags":["cve.org"],"epss":0.0063,"epssPercentile":0.49107,"ingestedAt":"2026-10-16T17:24:46.664Z","slug":"CVE-2026-31638","body":"## Overview\n\nIn 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->call 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.\n\n## Affected\n\n- `Linux >= 5e6ef4f1017c7f844e305283bbd8875af475e2fc < b8f66447448d6c305a51413a67ec8ed26aa7d1dd`\n- `Linux >= 5e6ef4f1017c7f844e305283bbd8875af475e2fc < 0c156aff8a2d4fa0d61db7837641975cf0e5452d`\n- `Linux >= 5e6ef4f1017c7f844e305283bbd8875af475e2fc < 8299ca146489664e3c0c90a3b8900d8335b1ede4`\n- `Linux >= 5e6ef4f1017c7f844e305283bbd8875af475e2fc < 9fb09861e2b8d1abfe2efaf260c9f1d30080ea38`\n- `Linux >= 5e6ef4f1017c7f844e305283bbd8875af475e2fc < 6331f1b24a3e85465f6454e003a3e6c22005a5c5`\n- `Linux 6.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}