CVE-2024-44934

HIGH EPSS 12.1%
Published Aug 26, 20241y ago · Modified Jun 17, 20262w ago
7.8 CVSS 3.1
High
Find Similar
Published Aug 26, 2024 1y ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: net: bridge: mcast: wait for previous gc cycles when removing port syzbot hit a use-after-free[1] which is caused because the bridge doesn't make sure that all previous garbage has been collected when removing a port. What happens is: CPU 1 CPU 2 start gc cycle remove port acquire gc lock first wait for lock call br_multicasg_gc() directly acquire lock now but free port the port can be freed while grp timers still running Make sure all previous gc cycles have finished by using flush_work before freeing the port. [1] BUG: KASAN: slab-use-after-free in br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861 Read of size 8 at addr ffff888071d6d000 by task syz.5.1232/9699 CPU: 1 PID: 9699 Comm: syz.5.1232 Not tainted 6.10.0-rc5-syzkaller-00021-g24ca36a562d6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861 call_timer_fn+0x1a3/0x610 kernel/time/timer.c:1792 expire_timers kernel/time/timer.c:1843 [inline] __run_timers+0x74b/0xaf0 kernel/time/timer.c:2417 __run_timer_base kernel/time/timer.c:2428 [inline] __run_timer_base kernel/time/timer.c:2421 [inline] run_timer_base+0x111/0x190 kernel/time/timer.c:2437

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
12.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 6

VendorProductVersionRange
linuxlinux_kernel*≥5.10  –  <5.15.165
linuxlinux_kernel*≥5.16  –  <6.1.105
linuxlinux_kernel*≥6.2  –  <6.6.46
linuxlinux_kernel*≥6.7  –  <6.10.5
linuxlinux_kernel6.11any
linuxlinux_kernel6.11any

References 6

  • git.kernel.org https://git.kernel.org/stable/c/0d8b26e10e680c01522d7cc14abe04c3265a928f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1e16828020c674b3be85f52685e8b80f9008f50f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/92c4ee25208d0f35dafc3213cdf355fbe449e078
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b2f794b168cf560682ff976b255aa6d29d14a658
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e3145ca904fa8dbfd1a5bf0187905bc117b0efce
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/0d8b26e10e680c01522d7cc14abe04c3265a928f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/1e16828020c674b3be85f52685e8b80f9008f50f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/92c4ee25208d0f35dafc3213cdf355fbe449e078
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b2f794b168cf560682ff976b255aa6d29d14a658
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e3145ca904fa8dbfd1a5bf0187905bc117b0efce
    Patch