CVE-2023-52922

can: bcm: Fix UAF in bcm_proc_show()

State: Published
Severity: 7.8 High
Published: Nov 28, 2024
Updated: Aug 5, 2026
Reserved: Aug 21, 2024

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
LinuxLinux	ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 11b8e27ed448baa385d90154a141466bd5e92f18Affected ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 9b58d36d0c1ea29a9571e0222a9c29df0ccfb7ffAffected ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 9533dbfac0ff7edd77a5fa2c24974b1d66c8b0a6Affected ffd980f976e7fd666c2e61bf8ab35107efd11828 to before cf254b4f68e480e73dab055014e002b77aed30edAffected ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 3c3941bb1eb53abe7d640ffee5c4d6b559829ab3Affected ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 995f47d76647708ec26c6e388663ad4f3f264787Affected ffd980f976e7fd666c2e61bf8ab35107efd11828 to before dfd0aa26e9a07f2ce546ccf8304ead6a2914e8a7Affected ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 55c3b96074f3f9b0aee19bf93cd71af7516582bbAffected
LinuxLinux	2.6.25Affected before 2.6.25Not affected 4.14.322 through 4.14.Not affected 4.19.291 through 4.19.Not affected 5.4.251 through 5.4.Not affected 5.10.188 through 5.10.Not affected 5.15.123 through 5.15.Not affected 6.1.42 through 6.1.Not affected 6.4.7 through 6.4.*Not affected 6.5 and laterNot affected

Product

Versions

LinuxLinux

ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 11b8e27ed448baa385d90154a141466bd5e92f18Affected
ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 9b58d36d0c1ea29a9571e0222a9c29df0ccfb7ffAffected
ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 9533dbfac0ff7edd77a5fa2c24974b1d66c8b0a6Affected
ffd980f976e7fd666c2e61bf8ab35107efd11828 to before cf254b4f68e480e73dab055014e002b77aed30edAffected
ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 3c3941bb1eb53abe7d640ffee5c4d6b559829ab3Affected
ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 995f47d76647708ec26c6e388663ad4f3f264787Affected
ffd980f976e7fd666c2e61bf8ab35107efd11828 to before dfd0aa26e9a07f2ce546ccf8304ead6a2914e8a7Affected
ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 55c3b96074f3f9b0aee19bf93cd71af7516582bbAffected

LinuxLinux

2.6.25Affected
before 2.6.25Not affected
4.14.322 through 4.14.*Not affected
4.19.291 through 4.19.*Not affected
5.4.251 through 5.4.*Not affected
5.10.188 through 5.10.*Not affected
5.15.123 through 5.15.*Not affected
6.1.42 through 6.1.*Not affected
6.4.7 through 6.4.*Not affected
6.5 and laterNot affected

References

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