PT-2023-9465 · Linux+3 · Linux Kernel+3
Jakub Sitnicki
·
Published
2023-09-29
·
Updated
2025-01-13
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CVE-2023-52523
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
The vulnerability is related to the Linux kernel's sockmap component, where a hard-coded assumption in the call-chain expects the egress socket to be a TCP socket. However, with the introduction of redirects to non-TCP sockets in commit 122e6c79efe1 for BPF sk skb programs, attempts to send-to-egress through a non-TCP socket can lead to a crash due to an invalid downcast from sock to tcp sock, resulting in a kernel NULL pointer dereference. When attempted, the user will receive an EACCES error from send/sendto/sendmsg() syscall.
Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
NULL Pointer Dereference
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Weakness Enumeration
Related Identifiers
Affected Products
Astra Linux
Linux Kernel
Red Os
Suse