{
  "threat_severity" : "Moderate",
  "public_date" : "2024-08-26T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: net: bridge: mcast: wait for previous gc cycles when removing port",
    "id" : "2307891",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2307891"
  },
  "cvss3" : {
    "cvss3_base_score" : "6.6",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L",
    "status" : "verified"
  },
  "cwe" : "CWE-416",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nnet: bridge: mcast: wait for previous gc cycles when removing port\nsyzbot hit a use-after-free[1] which is caused because the bridge doesn't\nmake sure that all previous garbage has been collected when removing a\nport. What happens is:\nCPU 1                   CPU 2\nstart gc cycle           remove port\nacquire gc lock first\nwait for lock\ncall br_multicasg_gc() directly\nacquire lock now but    free port\nthe port can be freed\nwhile grp timers still\nrunning\nMake sure all previous gc cycles have finished by using flush_work before\nfreeing the port.\n[1]\nBUG: KASAN: slab-use-after-free in br_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861\nRead of size 8 at addr ffff888071d6d000 by task syz.5.1232/9699\nCPU: 1 PID: 9699 Comm: syz.5.1232 Not tainted 6.10.0-rc5-syzkaller-00021-g24ca36a562d6 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024\nCall Trace:\n<IRQ>\n__dump_stack lib/dump_stack.c:88 [inline]\ndump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114\nprint_address_description mm/kasan/report.c:377 [inline]\nprint_report+0xc3/0x620 mm/kasan/report.c:488\nkasan_report+0xd9/0x110 mm/kasan/report.c:601\nbr_multicast_port_group_expired+0x4c0/0x550 net/bridge/br_multicast.c:861\ncall_timer_fn+0x1a3/0x610 kernel/time/timer.c:1792\nexpire_timers kernel/time/timer.c:1843 [inline]\n__run_timers+0x74b/0xaf0 kernel/time/timer.c:2417\n__run_timer_base kernel/time/timer.c:2428 [inline]\n__run_timer_base kernel/time/timer.c:2421 [inline]\nrun_timer_base+0x111/0x190 kernel/time/timer.c:2437", "A possible use-after-free was found in the Linux kernel in net/bridge/br_multicast.c." ],
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2025-05-13T00:00:00Z",
    "advisory" : "RHSA-2025:6966",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-570.12.1.el9_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2025-05-13T00:00:00Z",
    "advisory" : "RHSA-2025:6966",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "kernel-0:5.14.0-570.12.1.el9_6"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Out of support scope",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Will not fix",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Will not fix",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2024-44934\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-44934\nhttps://lore.kernel.org/linux-cve-announce/2024082641-CVE-2024-44934-a7fe@gregkh/T" ],
  "name" : "CVE-2024-44934",
  "csaw" : false
}