CVE-2023-52922

can: bcm: Fix UAF in bcm_proc_show()

Description

In the Linux kernel, the following vulnerability has been resolved: can: bcm: Fix UAF in bcm_proc_show() BUG: KASAN: slab-use-after-free in bcm_proc_show+0x969/0xa80 Read of size 8 at addr ffff888155846230 by task cat/7862 CPU: 1 PID: 7862 Comm: cat Not tainted 6.5.0-rc1-00153-gc8746099c197 #230 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0xd5/0x150 print_report+0xc1/0x5e0 kasan_report+0xba/0xf0 bcm_proc_show+0x969/0xa80 seq_read_iter+0x4f6/0x1260 seq_read+0x165/0x210 proc_reg_read+0x227/0x300 vfs_read+0x1d5/0x8d0 ksys_read+0x11e/0x240 do_syscall_64+0x35/0xb0 entry_SYSCALL_64_after_hwframe+0x63/0xcd Allocated by task 7846: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 __kasan_kmalloc+0x9e/0xa0 bcm_sendmsg+0x264b/0x44e0 sock_sendmsg+0xda/0x180 ____sys_sendmsg+0x735/0x920 ___sys_sendmsg+0x11d/0x1b0 __sys_sendmsg+0xfa/0x1d0 do_syscall_64+0x35/0xb0 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 7846: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 kasan_save_free_info+0x27/0x40 ____kasan_slab_free+0x161/0x1c0 slab_free_freelist_hook+0x119/0x220 __kmem_cache_free+0xb4/0x2e0 rcu_core+0x809/0x1bd0 bcm_op is freed before procfs entry be removed in bcm_release(), this lead to bcm_proc_show() may read the freed bcm_op.

Category

7.8
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.03%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/11b8e27ed448baa385d90154a141466bd5e92f18 patch
https://git.kernel.org/stable/c/9b58d36d0c1ea29a9571e0222a9c29df0ccfb7ff patch
https://git.kernel.org/stable/c/9533dbfac0ff7edd77a5fa2c24974b1d66c8b0a6 patch
https://git.kernel.org/stable/c/cf254b4f68e480e73dab055014e002b77aed30ed patch
https://git.kernel.org/stable/c/3c3941bb1eb53abe7d640ffee5c4d6b559829ab3 patch
https://git.kernel.org/stable/c/995f47d76647708ec26c6e388663ad4f3f264787 patch
https://git.kernel.org/stable/c/dfd0aa26e9a07f2ce546ccf8304ead6a2914e8a7 patch
https://git.kernel.org/stable/c/55c3b96074f3f9b0aee19bf93cd71af7516582bb patch

Frequently Asked Questions

What is the severity of CVE-2023-52922?
CVE-2023-52922 has been scored as a high severity vulnerability.
How to fix CVE-2023-52922?
To fix CVE-2023-52922, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-52922 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-52922 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-52922?
CVE-2023-52922 affects Linux Linux, Linux Linux.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.