{"id":"CVE-2022-49450","summary":"rxrpc: Fix listen() setting the bar too high for the prealloc rings","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix listen() setting the bar too high for the prealloc rings\n\nAF_RXRPC's listen() handler lets you set the backlog up to 32 (if you bump\nup the sysctl), but whilst the preallocation circular buffers have 32 slots\nin them, one of them has to be a dead slot because we're using CIRC_CNT().\n\nThis means that listen(rxrpc_sock, 32) will cause an oops when the socket\nis closed because rxrpc_service_prealloc_one() allocated one too many calls\nand rxrpc_discard_prealloc() won't then be able to get rid of them because\nit'll think the ring is empty.  rxrpc_release_calls_on_socket() then tries\nto abort them, but oopses because call-\u003epeer isn't yet set.\n\nFix this by setting the maximum backlog to RXRPC_BACKLOG_MAX - 1 to match\nthe ring capacity.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000086\n ...\n RIP: 0010:rxrpc_send_abort_packet+0x73/0x240 [rxrpc]\n Call Trace:\n  \u003cTASK\u003e\n  ? __wake_up_common_lock+0x7a/0x90\n  ? rxrpc_notify_socket+0x8e/0x140 [rxrpc]\n  ? rxrpc_abort_call+0x4c/0x60 [rxrpc]\n  rxrpc_release_calls_on_socket+0x107/0x1a0 [rxrpc]\n  rxrpc_release+0xc9/0x1c0 [rxrpc]\n  __sock_release+0x37/0xa0\n  sock_close+0x11/0x20\n  __fput+0x89/0x240\n  task_work_run+0x59/0x90\n  do_exit+0x319/0xaa0","modified":"2026-04-02T08:27:36.636293Z","published":"2025-02-26T02:13:00.379Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49450.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/369de57492c4f1a42563c5a3bd365822ca3bfc79"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4a3a78b7918bdd723d8c7c9786522ca969bffcc4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5b4826657d36c218e9f08e8d3223b0edce3de88f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/616f76498d5ddf26b997caf64a95cda3c8a55533"},{"type":"WEB","url":"https://git.kernel.org/stable/c/61fb38cfbb1d54d3dafd0c25752f684b3cd00b32"},{"type":"WEB","url":"https://git.kernel.org/stable/c/88e22159750b0d55793302eeed8ee603f5c1a95c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/91b34bf0409f43bb60453bab23c5beadd726d022"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b3a9b227d5e7467b8518160ff034ea22bb9de573"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e198f1930050e3115c80b67d9249f80f98a27c67"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49450.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49450"},{"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":"00e907127e6f86d0f9b122d9b4347a8aa09a8b61"},{"fixed":"61fb38cfbb1d54d3dafd0c25752f684b3cd00b32"},{"fixed":"616f76498d5ddf26b997caf64a95cda3c8a55533"},{"fixed":"4a3a78b7918bdd723d8c7c9786522ca969bffcc4"},{"fixed":"91b34bf0409f43bb60453bab23c5beadd726d022"},{"fixed":"5b4826657d36c218e9f08e8d3223b0edce3de88f"},{"fixed":"b3a9b227d5e7467b8518160ff034ea22bb9de573"},{"fixed":"369de57492c4f1a42563c5a3bd365822ca3bfc79"},{"fixed":"e198f1930050e3115c80b67d9249f80f98a27c67"},{"fixed":"88e22159750b0d55793302eeed8ee603f5c1a95c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49450.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:N/I:N/A:H"}]}