CVE - CVE-2022-49450

CVE-ID
CVE-2022-49450	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix listen() setting the bar too high for the prealloc rings AF_RXRPC's listen() handler lets you set the backlog up to 32 (if you bump up the sysctl), but whilst the preallocation circular buffers have 32 slots in them, one of them has to be a dead slot because we're using CIRC_CNT(). This means that listen(rxrpc_sock, 32) will cause an oops when the socket is closed because rxrpc_service_prealloc_one() allocated one too many calls and rxrpc_discard_prealloc() won't then be able to get rid of them because it'll think the ring is empty. rxrpc_release_calls_on_socket() then tries to abort them, but oopses because call->peer isn't yet set. Fix this by setting the maximum backlog to RXRPC_BACKLOG_MAX - 1 to match the ring capacity. BUG: kernel NULL pointer dereference, address: 0000000000000086 ... RIP: 0010:rxrpc_send_abort_packet+0x73/0x240 [rxrpc] Call Trace: <TASK> ? __wake_up_common_lock+0x7a/0x90 ? rxrpc_notify_socket+0x8e/0x140 [rxrpc] ? rxrpc_abort_call+0x4c/0x60 [rxrpc] rxrpc_release_calls_on_socket+0x107/0x1a0 [rxrpc] rxrpc_release+0xc9/0x1c0 [rxrpc] __sock_release+0x37/0xa0 sock_close+0x11/0x20 __fput+0x89/0x240 task_work_run+0x59/0x90 do_exit+0x319/0xaa0
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/369de57492c4f1a42563c5a3bd365822ca3bfc79 URL:https://git.kernel.org/stable/c/369de57492c4f1a42563c5a3bd365822ca3bfc79 MISC:https://git.kernel.org/stable/c/4a3a78b7918bdd723d8c7c9786522ca969bffcc4 URL:https://git.kernel.org/stable/c/4a3a78b7918bdd723d8c7c9786522ca969bffcc4 MISC:https://git.kernel.org/stable/c/5b4826657d36c218e9f08e8d3223b0edce3de88f URL:https://git.kernel.org/stable/c/5b4826657d36c218e9f08e8d3223b0edce3de88f MISC:https://git.kernel.org/stable/c/616f76498d5ddf26b997caf64a95cda3c8a55533 URL:https://git.kernel.org/stable/c/616f76498d5ddf26b997caf64a95cda3c8a55533 MISC:https://git.kernel.org/stable/c/61fb38cfbb1d54d3dafd0c25752f684b3cd00b32 URL:https://git.kernel.org/stable/c/61fb38cfbb1d54d3dafd0c25752f684b3cd00b32 MISC:https://git.kernel.org/stable/c/88e22159750b0d55793302eeed8ee603f5c1a95c URL:https://git.kernel.org/stable/c/88e22159750b0d55793302eeed8ee603f5c1a95c MISC:https://git.kernel.org/stable/c/91b34bf0409f43bb60453bab23c5beadd726d022 URL:https://git.kernel.org/stable/c/91b34bf0409f43bb60453bab23c5beadd726d022 MISC:https://git.kernel.org/stable/c/b3a9b227d5e7467b8518160ff034ea22bb9de573 URL:https://git.kernel.org/stable/c/b3a9b227d5e7467b8518160ff034ea22bb9de573 MISC:https://git.kernel.org/stable/c/e198f1930050e3115c80b67d9249f80f98a27c67 URL:https://git.kernel.org/stable/c/e198f1930050e3115c80b67d9249f80f98a27c67
Assigning CNA
kernel.org
Date Record Created
20250226	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250226)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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