CVE-2023-52922

can: bcm: Fix UAF in bcm_proc_show()

HIGH

7.8

CVSS Score

Published: November 28, 2024 at 03:09 PM UTC

Updated: August 5, 2026 at 10:24 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.8

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

2.6.25 ≤ v < 4.14.3222.6.25 ≤ v < 4.19.2912.6.25 ≤ v < 5.10.1882.6.25 ≤ v < 5.15.1232.6.25 ≤ v < 5.4.2512.6.25 ≤ v < 6.1.422.6.25 ≤ v < 6.4.72.6.25 ≤ v < 6.54.15 ≤ v < 4.19.2914.20 ≤ v < 5.4.2515.11 ≤ v < 5.15.1235.16 ≤ v < 6.1.425.5 ≤ v < 5.10.1886.2 ≤ v < 6.4.76.5 rc1 6.5 rc2ffd980f976e7fd666c2e61bf8ab35107efd11828

Vendor states this is fixed in 11b8e27ed448baa385d90154a141466bd5e92f18 (fixed)

Vendor states this is fixed in 3c3941bb1eb53abe7d640ffee5c4d6b559829ab3 (fixed)

Vendor states this is fixed in 55c3b96074f3f9b0aee19bf93cd71af7516582bb (fixed)

Vendor states this is fixed in 9533dbfac0ff7edd77a5fa2c24974b1d66c8b0a6 (fixed)

Vendor states this is fixed in 995f47d76647708ec26c6e388663ad4f3f264787 (fixed)

Vendor states this is fixed in 9b58d36d0c1ea29a9571e0222a9c29df0ccfb7ff (fixed)

Vendor states this is fixed in cf254b4f68e480e73dab055014e002b77aed30ed (fixed)

Vendor states this is fixed in dfd0aa26e9a07f2ce546ccf8304ead6a2914e8a7 (fixed)

Vendor states this is fixed in 2.6.25 (unaffected)

Vendor states this is fixed in 4.14.322 (unaffected)

Vendor states this is fixed in 4.19.291 (unaffected)

Vendor states this is fixed in 5.10.188 (unaffected)

Vendor states this is fixed in 5.15.123 (unaffected)

Vendor states this is fixed in 5.4.251 (unaffected)

Vendor states this is fixed in 6.1.42 (unaffected)

Vendor states this is fixed in 6.4.7 (unaffected)

Vendor states this is fixed in 6.5 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references