CVE-2024-44934— net: bridge: mcast: wait for previous gc cycles when removing port
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I. Basic Information for CVE-2024-44934
Vulnerability Information
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Vulnerability Title
net: bridge: mcast: wait for previous gc cycles when removing port
Source: NVD (National Vulnerability Database)
Vulnerability 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
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于内存释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2024-44934
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Same Patch Batch · Linux · 2024-08-26 · 39 CVEs total
| CVE-2024-44933 | bnxt_en : Fix memory out-of-bounds in bnxt_fill_hw_rss_tbl() | |
| CVE-2024-43908 | drm/amdgpu: Fix the null pointer dereference to ras_manager | |
| CVE-2024-43909 | drm/amdgpu/pm: Fix the null pointer dereference for smu7 | |
| CVE-2024-43910 | bpf: add missing check_func_arg_reg_off() to prevent out-of-bounds memory accesses | |
| CVE-2024-43911 | wifi: mac80211: fix NULL dereference at band check in starting tx ba session | |
| CVE-2024-43912 | wifi: nl80211: disallow setting special AP channel widths | |
| CVE-2024-43913 | nvme: apple: fix device reference counting | |
| CVE-2024-43914 | md/raid5: avoid BUG_ON() while continue reshape after reassembling | |
| CVE-2024-44931 | gpio: prevent potential speculation leaks in gpio_device_get_desc() | |
| CVE-2024-44932 | idpf: fix UAFs when destroying the queues | |
| CVE-2024-43907 | drm/amdgpu/pm: Fix the null pointer dereference in apply_state_adjust_rules | |
| CVE-2024-44935 | sctp: Fix null-ptr-deref in reuseport_add_sock(). | |
| CVE-2024-44936 | power: supply: rt5033: Bring back i2c_set_clientdata | |
| CVE-2024-44937 | platform/x86: intel-vbtn: Protect ACPI notify handler against recursion | |
| CVE-2024-44938 | jfs: Fix shift-out-of-bounds in dbDiscardAG | |
| CVE-2024-44939 | jfs: fix null ptr deref in dtInsertEntry | |
| CVE-2024-44940 | fou: remove warn in gue_gro_receive on unsupported protocol | |
| CVE-2024-44941 | f2fs: fix to cover read extent cache access with lock | |
| CVE-2024-44942 | f2fs: fix to do sanity check on F2FS_INLINE_DATA flag in inode during GC | |
| CVE-2024-43896 | ASoC: cs-amp-lib: Fix NULL pointer crash if efi.get_variable is NULL |
Showing top 20 of 39 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
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