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CVE-2024-44934

net: bridge: mcast: wait for previous gc cycles when removing port

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

Timeline

  1. ID reserved

    By Linux

  2. · 5 days later

    Published

  3. · 24 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2024-44934, by who scored it
Scored byCVSSScoreVector
LinuxCNA (assigner)3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Modified3.1High7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.22% · top 88% of all CVEs (10 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.

Affected products

  • Linux · Linux

    • affected e12cec65b5546f19217e26aafb8add6e2fadca18 – < 1e16828020c674b3be85f52685e8b80f9008f50f
    • affected e12cec65b5546f19217e26aafb8add6e2fadca18 – < 0d8b26e10e680c01522d7cc14abe04c3265a928f
    • affected e12cec65b5546f19217e26aafb8add6e2fadca18 – < e3145ca904fa8dbfd1a5bf0187905bc117b0efce
    • affected e12cec65b5546f19217e26aafb8add6e2fadca18 – < b2f794b168cf560682ff976b255aa6d29d14a658
    • affected e12cec65b5546f19217e26aafb8add6e2fadca18 – < 92c4ee25208d0f35dafc3213cdf355fbe449e078

  • Linux · Linux

    • affected 5.10
    • unaffected < 5.10
    • unaffected 5.15.165 – ≤ 5.15.*
    • unaffected 6.1.105 – ≤ 6.1.*
    • unaffected 6.6.46 – ≤ 6.6.*
    • unaffected 6.10.5 – ≤ 6.10.*
    • unaffected 6.11 – ≤ *

References

6

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .