UBUNTU-CVE-2024-40995
In the Linux kernel, the following vulnerability has been resolved: net/sched: act_api: fix possible infinite loop in tcf_idr_check_alloc() syzbot found hanging tasks waiting on rtnl_lock [1] A reproducer is available in the syzbot bug. When a request to add multiple actions with the same index is sent, the second request will block forever on the first request. This holds rtnl_lock, and causes tasks to hang. Return -EAGAIN to prevent infinite looping, while keeping documented behavior. [1] INFO: task kworker/1:0:5088 blocked for more than 143 seconds. Not tainted 6.9.0-rc4-syzkaller-00173-g3cdb45594619 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:0 state:D stack:23744 pid:5088 tgid:5088 ppid:2 flags:0x00004000 Workqueue: events_power_efficient reg_check_chans_work Call Trace: <TASK> context_switch kernel/sched/core.c:5409 [inline] __schedule+0xf15/0x5d00 kernel/sched/core.c:6746 __schedule_loop kernel/sched/core.c:6823 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6838 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 wiphy_lock include/net/cfg80211.h:5953 [inline] reg_leave_invalid_chans net/wireless/reg.c:2466 [inline] reg_check_chans_work+0x10a/0x10e0 net/wireless/reg.c:2481
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
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84 explicit affected versions
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16 explicit affected versions
3 explicit affected versions
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26 explicit affected versions
41 explicit affected versions
37 explicit affected versions
12 explicit affected versions
14 explicit affected versions
38 explicit affected versions
44 explicit affected versions
9 explicit affected versions
44 explicit affected versions
11 explicit affected versions
4 explicit affected versions
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1 explicit affected versions
50 explicit affected versions
13 explicit affected versions
43 explicit affected versions
50 explicit affected versions
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8 explicit affected versions
7 explicit affected versions
14 explicit affected versions
85 explicit affected versions
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11 explicit affected versions
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03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: net/sched: act_api: fix possible infinite loop in tcf_idr_check_alloc() syzbot found hanging tasks waiting on rtnl_lock [1] A reproducer is available in the syzbot bug. When a request to add multiple actions with the same index is sent, the second request will block forever on the first request. This holds rtnl_lock, and causes tasks to hang. Return -EAGAIN to prevent infinite looping, while keeping documented behavior. [1] INFO: task kworker/1:0:5088 blocked for more than 143 seconds. Not tainted 6.9.0-rc4-syzkaller-00173-g3cdb45594619 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:0 state:D stack:23744 pid:5088 tgid:5088 ppid:2 flags:0x00004000 Workqueue: events_power_efficient reg_check_chans_work Call Trace: <TASK> context_switch kernel/sched/core.c:5409 [inline] __schedule+0xf15/0x5d00 kernel/sched/core.c:6746 __schedule_loop kernel/sched/core.c:6823 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6838 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 wiphy_lock include/net/cfg80211.h:5953 [inline] reg_leave_invalid_chans net/wireless/reg.c:2466 [inline] reg_check_chans_work+0x10a/0x10e0 net/wireless/reg.c:2481
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/d864319871b05fadd153e0aede4811ca7008f5d6
- https://git.kernel.org/stable/c/0d8a2d287c8a394c0d4653f0c6c7be4c688e5a74
- https://git.kernel.org/stable/c/25987a97eec4d5f897cd04ee1b45170829c610da
- https://git.kernel.org/stable/c/5f926aa96b08b6c47178fe1171e7ae331c695fc2
- https://git.kernel.org/stable/c/6fc78d67f51aeb9a542d39a8714e16bc411582d4
- https://git.kernel.org/stable/c/7a0e497b597df7c4cf2b63fc6e9188b6cabe5335
- https://git.kernel.org/stable/c/c6a7da65a296745535a964be1019ec7691b0cb90
- https://git.kernel.org/stable/c/d864319871b05fadd153e0aede4811ca7008f5d6
- https://ubuntu.com/security/CVE-2024-40995
- https://ubuntu.com/security/notices/USN-6999-1
- https://ubuntu.com/security/notices/USN-6999-2
- https://ubuntu.com/security/notices/USN-7003-1
- https://ubuntu.com/security/notices/USN-7003-2
- https://ubuntu.com/security/notices/USN-7003-3
- https://ubuntu.com/security/notices/USN-7003-4
- https://ubuntu.com/security/notices/USN-7003-5
- https://ubuntu.com/security/notices/USN-7004-1
- https://ubuntu.com/security/notices/USN-7005-1
- https://ubuntu.com/security/notices/USN-7005-2
- https://ubuntu.com/security/notices/USN-7006-1
- https://ubuntu.com/security/notices/USN-7007-1
- https://ubuntu.com/security/notices/USN-7007-2
- https://ubuntu.com/security/notices/USN-7007-3
- https://ubuntu.com/security/notices/USN-7008-1
- https://ubuntu.com/security/notices/USN-7009-1
- https://ubuntu.com/security/notices/USN-7009-2
- https://ubuntu.com/security/notices/USN-7019-1
- https://ubuntu.com/security/notices/USN-7029-1
- https://www.cve.org/CVERecord?id=CVE-2024-40995