CVE-2024-40995

Summary

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

Affected Software

VendorProductVersion RangeStatus
LinuxLinux0190c1d452a91c38a3462abdd81752be1b9006a8 < 0d8a2d287c8a394c0d4653f0c6c7be4c688e5a74affected
LinuxLinux0190c1d452a91c38a3462abdd81752be1b9006a8 < c6a7da65a296745535a964be1019ec7691b0cb90affected
LinuxLinux0190c1d452a91c38a3462abdd81752be1b9006a8 < 25987a97eec4d5f897cd04ee1b45170829c610daaffected
LinuxLinux0190c1d452a91c38a3462abdd81752be1b9006a8 < 6fc78d67f51aeb9a542d39a8714e16bc411582d4affected
LinuxLinux0190c1d452a91c38a3462abdd81752be1b9006a8 < 5f926aa96b08b6c47178fe1171e7ae331c695fc2affected
LinuxLinux0190c1d452a91c38a3462abdd81752be1b9006a8 < 7a0e497b597df7c4cf2b63fc6e9188b6cabe5335affected
LinuxLinux0190c1d452a91c38a3462abdd81752be1b9006a8 < d864319871b05fadd153e0aede4811ca7008f5d6affected
LinuxLinux4.19affected
LinuxLinux0 < 4.19unaffected
LinuxLinux5.4.279 <= 5.4.*unaffected
LinuxLinux5.10.221 <= 5.10.*unaffected
LinuxLinux5.15.162 <= 5.15.*unaffected
LinuxLinux6.1.96 <= 6.1.*unaffected
LinuxLinux6.6.36 <= 6.6.*unaffected
LinuxLinux6.9.7 <= 6.9.*unaffected
LinuxLinux6.10 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

Additional References

References