CVE-2024-50155: netdevsim: use cond_resched() in nsim_dev_trap_report_work()
In the Linux kernel, the following vulnerability has been resolved:
netdevsim: use condresched() in nsimdevtrapreportwork()
I am still seeing many syzbot reports hinting that syzbot might fool nsimdevtrapreportwork() with hundreds of ports [1]
Lets use condresched(), and systemunboundwq instead of implicit systemwq.
[1] INFO: task syz-executor:20633 blocked for more than 143 seconds. Not tainted 6.12.0-rc2-syzkaller-00205-g1d227fcc7222 #0 "echo 0 > /proc/sys/kernel/hungtasktimeoutsecs" disables this message. task:syz-executor state:D stack:25856 pid:20633 tgid:20633 ppid:1 flags:0x00004006 ... NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 16760 Comm: kworker/1:0 Not tainted 6.12.0-rc2-syzkaller-00205-g1d227fcc7222 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events nsimdevtrapreportwork RIP: 0010:sanitizercovtracepc+0x0/0x70 kernel/kcov.c:210 Code: 89 fb e8 23 00 00 00 48 8b 3d 04 fb 9c 0c 48 89 de 5b e9 c3 c7 5d 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 c0 d7 03 00 65 8b 15 60 f0 RSP: 0018:ffffc90000a187e8 EFLAGS: 00000246 RAX: 0000000000000100 RBX: ffffc90000a188e0 RCX: ffff888027d3bc00 RDX: ffff888027d3bc00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff88804a2e6000 R08: ffffffff8a4bc495 R09: ffffffff89da3577 R10: 0000000000000004 R11: ffffffff8a4bc2b0 R12: dffffc0000000000 R13: ffff88806573b503 R14: dffffc0000000000 R15: ffff8880663cca00 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc90a747f98 CR3: 000000000e734000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 000000000000002b DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <TASK> localbhenableip+0x1bb/0x200 kernel/softirq.c:382 spinunlockbh include/linux/spinlock.h:396 [inline] nsimdevtrapreport drivers/net/netdevsim/dev.c:820 [inline] nsimdevtrapreportwork+0x75d/0xaa0 drivers/net/netdevsim/dev.c:850 processonework kernel/workqueue.c:3229 [inline] processscheduledworks+0xa63/0x1850 kernel/workqueue.c:3310 workerthread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 retfromfork+0x4b/0x80 arch/x86/kernel/process.c:147 retfromforkasm+0x1a/0x30 arch/x86/entry/entry64.S:244 </TASK>
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2024-50155?
CVE-2024-50155 has not been assigned a specific severity rating yet, but it involves a vulnerability in the Linux kernel that could facilitate denial-of-service attacks.
How do I fix CVE-2024-50155?
To fix CVE-2024-50155, you should upgrade to a patched version of the Linux kernel, such as 6.1.123-1, 6.1.128-1, or higher respective versions.
Which versions of the Linux kernel are affected by CVE-2024-50155?
CVE-2024-50155 affects Linux kernel versions from 6.1.78 up to, but not including, 6.1.115, as well as other specific versions within the 6.6 and 6.8 to 6.11 series.
What does CVE-2024-50155 vulnerability compromise?
CVE-2024-50155 may compromise the kernel's ability to handle netdevsim functions, potentially leading to performance issues or denial of service integrity.
Is there a workaround for CVE-2024-50155 if I cannot apply the patch immediately?
There is no specific workaround mentioned for CVE-2024-50155, so applying the latest patches is strongly recommended.