{"cve":"CVE-2022-49450","nvd":{"published":"2025-02-26T07:01:21.390","modified":"2026-06-17T05:18:05.190","status":"Modified","description":"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->peer 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  <TASK>\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","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/369de57492c4f1a42563c5a3bd365822ca3bfc79","https://git.kernel.org/stable/c/4a3a78b7918bdd723d8c7c9786522ca969bffcc4","https://git.kernel.org/stable/c/5b4826657d36c218e9f08e8d3223b0edce3de88f","https://git.kernel.org/stable/c/616f76498d5ddf26b997caf64a95cda3c8a55533","https://git.kernel.org/stable/c/61fb38cfbb1d54d3dafd0c25752f684b3cd00b32"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:59:48.811064707+00:00"},"epss":{"cve":"CVE-2022-49450","score":0.00291,"percentile":0.21667,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}