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🛡️ CVE-2023-52637 — debian-linux

🟠 CVSS 7.8 — High ✅ No Known Exploit CWE-416 NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

can: j1939: Fix UAF in j1939_sk_match_filter during setsockopt(SO_J1939_FILTER)

In the Linux kernel, the following vulnerability has been resolved:

can: j1939: Fix UAF in j1939_sk_match_filter during setsockopt(SO_J1939_FILTER)

Lock jsk->sk to prevent UAF when setsockopt(..., SO_J1939_FILTER, ...)

modifies jsk->filters while receiving packets.

Following trace was seen on affected system:

==================================================================

BUG: KASAN: slab-use-after-free in j1939_sk_recv_match_one+0x1af/0x2d0 [can_j1939]

Read of size 4 at addr ffff888012144014 by task j1939/350

CPU: 0 PID: 350 Comm: j1939 Tainted: G W OE 6.5.0-rc5 #1

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014

Call Trace:

print_report+0xd3/0x620

? kasan_complete_mode_report_info+0x7d/0x200

? j1939_sk_recv_match_one+0x1af/0x2d0 [can_j1939]

kasan_report+0xc2/0x100

? j1939_sk_recv_match_one+0x1af/0x2d0 [can_j1939]

__asan_load4+0x84/0xb0

j1939_sk_recv_match_one+0x1af/0x2d0 [can_j1939]

j1939_sk_recv+0x20b/0x320 [can_j1939]

? __kasan_check_write+0x18/0x20

? __pfx_j1939_sk_recv+0x10/0x10 [can_j1939]

? j1939_simple_recv+0x69/0x280 [can_j1939]

? j1939_ac_recv+0x5e/0x310 [can_j1939]

j1939_can_recv+0x43f/0x580 [can_j1939]

? __pfx_j1939_can_recv+0x10/0x10 [can_j1939]

? raw_rcv+0x42/0x3c0 [can_raw]

? __pfx_j1939_can_recv+0x10/0x10 [can_j1939]

can_rcv_filter+0x11f/0x350 [can]

can_receive+0x12f/0x190 [can]

? __pfx_can_rcv+0x10/0x10 [can]

can_rcv+0xdd/0x130 [can]

? __pfx_can_rcv+0x10/0x10 [can]

__netif_receive_skb_one_core+0x13d/0x150

? __pfx___netif_receive_skb_one_core+0x10/0x10

? __kasan_check_write+0x18/0x20

? _raw_spin_lock_irq+0x8c/0xe0

__netif_receive_skb+0x23/0xb0

process_backlog+0x107/0x260

__napi_poll+0x69/0x310

net_rx_action+0x2a1/0x580

? __pfx_net_rx_action+0x10/0x10

? __pfx__raw_spin_lock+0x10/0x10

? handle_irq_event+0x7d/0xa0

__do_softirq+0xf3/0x3f8

do_softirq+0x53/0x80

</IRQ>

<TASK>

__local_bh_enable_ip+0x6e/0x70

netif_rx+0x16b/0x180

can_send+0x32b/0x520 [can]

? __pfx_can_send+0x10/0x10 [can]

? __check_object_size+0x299/0x410

raw_sendmsg+0x572/0x6d0 [can_raw]

? __pfx_raw_sendmsg+0x10/0x10 [can_raw]

? apparmor_socket_sendmsg+0x2f/0x40

? __pfx_raw_sendmsg+0x10/0x10 [can_raw]

sock_sendmsg+0xef/0x100

sock_write_iter+0x162/0x220

? __pfx_sock_write_iter+0x10/0x10

? __rtnl_unlock+0x47/0x80

? security_file_permission+0x54/0x320

vfs_write+0x6ba/0x750

? __pfx_vfs_write+0x10/0x10

? __fget_light+0x1ca/0x1f0

? __rcu_read_unlock+0x5b/0x280

ksys_write+0x143/0x170

? __pfx_ksys_write+0x10/0x10

? __kasan_check_read+0x15/0x20

? fpregs_assert_state_consistent+0x62/0x70

__x64_sys_write+0x47/0x60

do_syscall_64+0x60/0x90

? do_syscall_64+0x6d/0x90

? irqentry_exit+0x3f/0x50

? exc_page_fault+0x79/0xf0

entry_SYSCALL_64_after_hwframe+0x6e/0xd8

Allocated by task 348:

kasan_save_stack+0x2a/0x50

kasan_set_track+0x29/0x40

kasan_save_alloc_info+0x1f/0x30

__kasan_kmalloc+0xb5/0xc0

__kmalloc_node_track_caller+0x67/0x160

j1939_sk_setsockopt+0x284/0x450 [can_j1939]

__sys_setsockopt+0x15c/0x2f0

__x64_sys_setsockopt+0x6b/0x80

do_syscall_64+0x60/0x90

entry_SYSCALL_64_after_hwframe+0x6e/0xd8

Freed by task 349:

kasan_save_stack+0x2a/0x50

kasan_set_track+0x29/0x40

kasan_save_free_info+0x2f/0x50

__kasan_slab_free+0x12e/0x1c0

__kmem_cache_free+0x1b9/0x380

kfree+0x7a/0x120

j1939_sk_setsockopt+0x3b2/0x450 [can_j1939]

__sys_setsockopt+0x15c/0x2f0

__x64_sys_setsockopt+0x6b/0x80

do_syscall_64+0x60/0x90

entry_SYSCALL_64_after_hwframe+0x6e/0xd8

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2023-52637 is classified as CWE-416: Use After Free. Memory is used after being released, so its contents may already belong to something else.

Affected software

CVE-2023-52637 is recorded against 3 packages.

  • debian-linux
  • kernel (from 6.7.0 up to 6.7.6)
  • linux-kernel

Timeline and source

Published on 3 April 2024 and last revised on 4 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
git.kernel.org
lists.debian.org

Other advisories for this package

debian-linux has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-416: Use After Free) in other software:

CVE-2023-52637 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE CWE-416
Public Exploit ✅ No
Source NVD
Published 2024-04-03
Updated 2026-08-20
Modified 2026-08-04

Affected Packages

Software From version Fixed in
debian-linux — —
kernel 6.7.0 6.7.6
linux-kernel — —

References

Similar Threats

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