CVE - CVE-2024-44934

CVE-ID
CVE-2024-44934	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/0d8b26e10e680c01522d7cc14abe04c3265a928f URL:https://git.kernel.org/stable/c/0d8b26e10e680c01522d7cc14abe04c3265a928f MISC:https://git.kernel.org/stable/c/1e16828020c674b3be85f52685e8b80f9008f50f URL:https://git.kernel.org/stable/c/1e16828020c674b3be85f52685e8b80f9008f50f MISC:https://git.kernel.org/stable/c/92c4ee25208d0f35dafc3213cdf355fbe449e078 URL:https://git.kernel.org/stable/c/92c4ee25208d0f35dafc3213cdf355fbe449e078 MISC:https://git.kernel.org/stable/c/b2f794b168cf560682ff976b255aa6d29d14a658 URL:https://git.kernel.org/stable/c/b2f794b168cf560682ff976b255aa6d29d14a658 MISC:https://git.kernel.org/stable/c/e3145ca904fa8dbfd1a5bf0187905bc117b0efce URL:https://git.kernel.org/stable/c/e3145ca904fa8dbfd1a5bf0187905bc117b0efce
Assigning CNA
kernel.org
Date Record Created
20240821	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240821)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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