CVE-2024-40995: net/sched: act_api: fix possible infinite loop in tcf_idr_check_alloc()
First published: Fri Jul 12 2024(Updated: )
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
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <5.4.279 | 5.4.279 |
| redhat/kernel | <5.10.221 | 5.10.221 |
| redhat/kernel | <5.15.162 | 5.15.162 |
| redhat/kernel | <6.1.96 | 6.1.96 |
| redhat/kernel | <6.6.36 | 6.6.36 |
| redhat/kernel | <6.9.7 | 6.9.7 |
| redhat/kernel | <6.10 | 6.10 |
| Linux Kernel | >=4.19<5.4.279 | |
| Linux Kernel | >=5.5<5.10.221 | |
| Linux Kernel | >=5.11<5.15.162 | |
| Linux Kernel | >=5.16<6.1.96 | |
| Linux Kernel | >=6.2<6.6.36 | |
| Linux Kernel | >=6.7<6.9.7 | |
| Linux Kernel | =6.10-rc1 | |
| Linux Kernel | =6.10-rc2 | |
| Linux Kernel | =6.10-rc3 | |
| Linux Kernel | =6.10-rc4 | |
| IBM Security Verify Governance - Identity Manager | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Software Stack | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Virtual Appliance | <=ISVG 10.0.2 | |
| IBM Security Verify Governance Identity Manager Container | <=ISVG 10.0.2 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.128-1 6.12.21-1 6.12.22-1 | |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://access.redhat.com/errata/RHSA-2024:5673
- https://access.redhat.com/errata/RHSA-2024:5672
- https://access.redhat.com/errata/RHSA-2024:6160
- https://access.redhat.com/errata/RHSA-2024:6156
- https://access.redhat.com/errata/RHSA-2024:6990
- https://access.redhat.com/errata/RHSA-2024:7001
- https://access.redhat.com/errata/RHSA-2024:6991
- https://access.redhat.com/errata/RHSA-2024:6993
- https://access.redhat.com/errata/RHSA-2024:7000
- https://access.redhat.com/errata/RHSA-2024:8617
- https://bugzilla.redhat.com/show_bug.cgi?id=2297579
- https://git.kernel.org/stable/c/0d8a2d287c8a394c0d4653f0c6c7be4c688e5a74
- https://git.kernel.org/stable/c/c6a7da65a296745535a964be1019ec7691b0cb90
- https://git.kernel.org/stable/c/25987a97eec4d5f897cd04ee1b45170829c610da
- https://git.kernel.org/stable/c/6fc78d67f51aeb9a542d39a8714e16bc411582d4
- https://git.kernel.org/stable/c/5f926aa96b08b6c47178fe1171e7ae331c695fc2
- https://git.kernel.org/stable/c/7a0e497b597df7c4cf2b63fc6e9188b6cabe5335
- https://git.kernel.org/stable/c/d864319871b05fadd153e0aede4811ca7008f5d6
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-40995
- https://nvd.nist.gov/vuln/detail/CVE-2024-40995
- https://launchpad.net/bugs/cve/CVE-2024-40995
- https://security-tracker.debian.org/tracker/CVE-2024-40995
- https://ubuntu.com/security/CVE-2024-40995
- https://git.kernel.org/linus/d864319871b05fadd153e0aede4811ca7008f5d6
- https://www.ibm.com/support/pages/node/7230443 (Advisory)
Frequently Asked Questions
What is the severity of CVE-2024-40995?
CVE-2024-40995 is a critical vulnerability that may lead to an infinite loop in the Linux kernel.
How do I fix CVE-2024-40995?
To fix CVE-2024-40995, update your Linux kernel to one of the fixed versions noted in the remediation details.
Which versions of the Linux kernel are affected by CVE-2024-40995?
CVE-2024-40995 affects several versions of the Linux kernel including versions prior to 5.4.279, 5.10.221, 5.15.162, and others listed in the remediation section.
What products are impacted by CVE-2024-40995?
Products affected by CVE-2024-40995 include various Red Hat and Debian Linux kernel versions.
Is there a known exploit for CVE-2024-40995?
Yes, CVE-2024-40995 has been found to cause hanging tasks and can be reproduced as indicated in the syzbot bug report.
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