{"id":"DEBIAN-CVE-2024-44934","details":"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:    \u003cIRQ\u003e    __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","modified":"2026-09-15T09:02:58.017634130Z","published":"2024-08-26T11:15:05.593Z","upstream":["CVE-2024-44934"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2024-44934"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.106-1"}]}],"versions":["6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-44934.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.10.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-44934.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.10.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2024-44934.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}