7.8

CVE-2023-52922

can: bcm: Fix UAF in bcm_proc_show()

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 2.6.25 < 4.14.322
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.291
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.251
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.188
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.123
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.42
Linux ≫ Linux Kernel Version >= 6.2 < 6.4.7
Linux ≫ Linux Kernel Version6.5 Updaterc1
Linux ≫ Linux Kernel Version6.5 Updaterc2
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.29% 0.201
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
134c704f-9b21-4f2e-91b3-4a467353bcc0 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://git.kernel.org/stable/c/11b8e27ed448baa385d90154a141466bd5e92f18
Patch
https://git.kernel.org/stable/c/3c3941bb1eb53abe7d640ffee5c4d6b559829ab3
Patch
https://git.kernel.org/stable/c/55c3b96074f3f9b0aee19bf93cd71af7516582bb
Patch
https://git.kernel.org/stable/c/9533dbfac0ff7edd77a5fa2c24974b1d66c8b0a6
Patch
https://git.kernel.org/stable/c/995f47d76647708ec26c6e388663ad4f3f264787
Patch
https://git.kernel.org/stable/c/9b58d36d0c1ea29a9571e0222a9c29df0ccfb7ff
Patch
https://git.kernel.org/stable/c/cf254b4f68e480e73dab055014e002b77aed30ed
Patch
https://git.kernel.org/stable/c/dfd0aa26e9a07f2ce546ccf8304ead6a2914e8a7
Patch
https://allelesecurity.com/use-after-free-vulnerability-in-can-bcm-subsystem-leading-to-information-disclosure-cve-2023-52922/