CVE-2022-50008: kprobes: don't call disarm_kprobe() for disabled kprobes

Published Jun 18, 2025
·
Updated

In the Linux kernel, the following vulnerability has been resolved:

kprobes: don't call disarmkprobe() for disabled kprobes

The assumption in disablekprobe() is wrong, and it could try to disarm an already disarmed kprobe and fire the WARNONCE() below. [0] We can easily reproduce this issue.

1. Write 0 to /sys/kernel/debug/kprobes/enabled.

# echo 0 > /sys/kernel/debug/kprobes/enabled

2. Run execsnoop. At this time, one kprobe is disabled.

# /usr/share/bcc/tools/execsnoop & [1] 2460 PCOMM PID PPID RET ARGS

# cat /sys/kernel/debug/kprobes/list ffffffff91345650 r x64sysexecve+0x0 [FTRACE] ffffffff91345650 k x64sysexecve+0x0 [DISABLED][FTRACE]

3. Write 1 to /sys/kernel/debug/kprobes/enabled, which changes kprobesalldisarmed to false but does not arm the disabled kprobe.

# echo 1 > /sys/kernel/debug/kprobes/enabled

# cat /sys/kernel/debug/kprobes/list ffffffff91345650 r x64sysexecve+0x0 [FTRACE] ffffffff91345650 k x64sysexecve+0x0 [DISABLED][FTRACE]

4. Kill execsnoop, when disablekprobe() calls disarmkprobe() for the disabled kprobe and hits the WARNONCE() in disarmkprobeftrace().

# fg /usr/share/bcc/tools/execsnoop ^C

Actually, WARNONCE() is fired twice, and unregisterkprobetop() misses some cleanups and leaves the aggregated kprobe in the hash table. Then, unregistertracekprobe() initialises tk->rp.kp.list and creates an infinite loop like this.

aggregated kprobe.list -> kprobe.list -. ^ | '..'

In this situation, these commands fall into the infinite loop and result in RCU stall or soft lockup.

cat /sys/kernel/debug/kprobes/list : showkprobeaddr() enters into the infinite loop with RCU.

/usr/share/bcc/tools/execsnoop : warnkproberereg() holds kprobemutex, and getvalidkprobe() is stuck in the loop.

To avoid the issue, make sure we don't call disarmkprobe() for disabled kprobes.

[0] Failed to disarm kprobe-ftrace at x64sysexecve+0x0/0x40 (error -2) WARNING: CPU: 6 PID: 2460 at kernel/kprobes.c:1130 disarmkprobeftrace.isra.19 (kernel/kprobes.c:1129) Modules linked in: ena CPU: 6 PID: 2460 Comm: execsnoop Not tainted 5.19.0+ #28 Hardware name: Amazon EC2 c5.2xlarge/, BIOS 1.0 10/16/2017 RIP: 0010:disarmkprobeftrace.isra.19 (kernel/kprobes.c:1129) Code: 24 8b 02 eb c1 80 3d c4 83 f2 01 00 75 d4 48 8b 75 00 89 c2 48 c7 c7 90 fa 0f 92 89 04 24 c6 05 ab 83 01 e8 e4 94 f0 ff <0f> 0b 8b 04 24 eb b1 89 c6 48 c7 c7 60 fa 0f 92 89 04 24 e8 cc 94 RSP: 0018:ffff9e6ec154bd98 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffffffff930f7b00 RCX: 0000000000000001 RDX: 0000000080000001 RSI: ffffffff921461c5 RDI: 00000000ffffffff RBP: ffff89c504286da8 R08: 0000000000000000 R09: c0000000fffeffff R10: 0000000000000000 R11: ffff9e6ec154bc28 R12: ffff89c502394e40 R13: ffff89c502394c00 R14: ffff9e6ec154bc00 R15: 0000000000000000 FS: 00007fe800398740(0000) GS:ffff89c812d80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c00057f010 CR3: 0000000103b54006 CR4: 00000000007706e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: <TASK> disablekprobe (kernel/kprobes.c:1716) disablekprobe (kernel/kprobes.c:2392) disabletracekprobe (kernel/trace/tracekprobe.c:340) disabletracekprobe (kernel/trace/tracekprobe.c:429) perftraceeventunreg.isra.2 (./include/linux/tracepoint.h:93 kernel/trace/traceeventperf.c:168) perfkprobedestroy (kernel/trace/traceeventperf.c:295) freeevent (kernel/events/core.c:4971) perfeventreleasekernel (kernel/events/core.c:5176) perfrelease (kernel/events/core.c:5186) fput (fs/filetable.c:321) taskworkrun (./include/linux/ ---truncated---

Affected Software

176 affected componentsFixes available
Linux Foundation Linux Kernel
Linux Linux kernel>=4.0<4.9.327
Linux Linux kernel>=4.10<4.14.292
Linux Linux kernel>=4.15<4.19.257
Linux Linux kernel>=4.20<5.4.212
Linux Linux kernel>=5.5<5.10.141
Linux Linux kernel>=5.11<5.15.65
Linux Linux kernel>=5.16<5.19.6
Linux Linux kernel=6.0-rc1
Linux Linux kernel=6.0-rc2
debian/linux<6.0.2-1
6.0.2-1
debian/linux<6.0.2-1
6.0.2-1
debian/linux<6.0.2-1
6.0.2-1
ubuntu/linux-azure<4.15.0-1158.173~14.04.1
4.15.0-1158.173~14.04.1
ubuntu/linux-aws*
ubuntu/linux-lts-xenial*
ubuntu/linux-aws-hwe<4.15.0-1147.159~16.04.1
4.15.0-1147.159~16.04.1
ubuntu/linux-azure<4.15.0-1159.174~16.04.1
4.15.0-1159.174~16.04.1
ubuntu/linux-gcp<4.15.0-1142.158~16.04.1
4.15.0-1142.158~16.04.1
ubuntu/linux-hwe<4.15.0-201.212~16.04.1
4.15.0-201.212~16.04.1
ubuntu/linux-oracle<4.15.0-1112.123~16.04.1
4.15.0-1112.123~16.04.1
ubuntu/linux*
ubuntu/linux-aws*
ubuntu/linux-hwe-edge*
ubuntu/linux-kvm*
ubuntu/linux-fips*
ubuntu/linux-fips*
ubuntu/linux<4.15.0-201.212
4.15.0-201.212
ubuntu/linux-aws<4.15.0-1147.159
4.15.0-1147.159
ubuntu/linux-aws-5.4<5.4.0-1089.97~18.04.1
5.4.0-1089.97~18.04.1
ubuntu/linux-azure-4.15<4.15.0-1158.173
4.15.0-1158.173
ubuntu/linux-azure-5.4<5.4.0-1095.101~18.04.1
5.4.0-1095.101~18.04.1
ubuntu/linux-gcp-4.15<4.15.0-1142.158
4.15.0-1142.158
ubuntu/linux-gcp-5.4<5.4.0-1093.102~18.04.1
5.4.0-1093.102~18.04.1
ubuntu/linux-hwe-5.4<5.4.0-132.148~18.04.1
5.4.0-132.148~18.04.1
ubuntu/linux-ibm-5.4<5.4.0-1037.42~18.04.1
5.4.0-1037.42~18.04.1
ubuntu/linux-kvm<4.15.0-1133.138
4.15.0-1133.138
ubuntu/linux-oracle<4.15.0-1112.123
4.15.0-1112.123
ubuntu/linux-oracle-5.4<5.4.0-1087.96~18.04.1
5.4.0-1087.96~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1074.85~18.04.1
5.4.0-1074.85~18.04.1
ubuntu/linux-aws-5.0*
ubuntu/linux-aws-5.3*
ubuntu/linux-azure*
ubuntu/linux-azure-5.3*
ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
ubuntu/linux-gcp-5.3*
ubuntu/linux-gke-4.15*
ubuntu/linux-gke-5.4*
ubuntu/linux-gkeop-5.4*
ubuntu/linux-hwe*
ubuntu/linux-hwe-edge*
ubuntu/linux-oem*
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-aws-fips<4.15.0-2087.93
4.15.0-2087.93
ubuntu/linux-azure-fips<4.15.0-2067.73
4.15.0-2067.73
ubuntu/linux-fips<4.15.0-1104.115
4.15.0-1104.115
ubuntu/linux-gcp-fips<4.15.0-2052.57
4.15.0-2052.57
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.4.0-132.148
5.4.0-132.148
ubuntu/linux-aws<5.4.0-1089.97
5.4.0-1089.97
ubuntu/linux-aws-5.15<5.15.0-1027.31~20.04.1
5.15.0-1027.31~20.04.1
ubuntu/linux-azure<5.4.0-1095.101
5.4.0-1095.101
ubuntu/linux-azure-5.15<5.15.0-1030.37~20.04.1
5.15.0-1030.37~20.04.1
ubuntu/linux-bluefield<5.4.0-1050.56
5.4.0-1050.56
ubuntu/linux-gcp<5.4.0-1093.102
5.4.0-1093.102
ubuntu/linux-gcp-5.15<5.15.0-1027.34~20.04.1
5.15.0-1027.34~20.04.1
ubuntu/linux-hwe-5.15<5.15.0-57.63~20.04.1
5.15.0-57.63~20.04.1
ubuntu/linux-ibm<5.4.0-1037.42
5.4.0-1037.42
ubuntu/linux-intel-iotg-5.15<5.15.0-1023.28~20.04.1
5.15.0-1023.28~20.04.1
ubuntu/linux-iot<5.4.0-1006.8
5.4.0-1006.8
ubuntu/linux-kvm<5.4.0-1079.85
5.4.0-1079.85
ubuntu/linux-lowlatency-hwe-5.15<5.15.0-58.64~20.04.1
5.15.0-58.64~20.04.1
ubuntu/linux-oracle<5.4.0-1087.96
5.4.0-1087.96
ubuntu/linux-oracle-5.15<5.15.0-1027.33~20.04.1
5.15.0-1027.33~20.04.1
ubuntu/linux-raspi<5.4.0-1074.85
5.4.0-1074.85
ubuntu/linux-riscv-5.15<5.15.0-1027.31~20.04.1
5.15.0-1027.31~20.04.1
ubuntu/linux-aws-5.11*
ubuntu/linux-aws-5.13*
ubuntu/linux-aws-5.8*
ubuntu/linux-azure-5.11*
ubuntu/linux-azure-5.13*
ubuntu/linux-azure-5.8*
ubuntu/linux-azure-fde*
ubuntu/linux-gcp-5.11*
ubuntu/linux-gcp-5.13*
ubuntu/linux-gcp-5.8*
ubuntu/linux-gke*
ubuntu/linux-gke-5.15*
ubuntu/linux-gkeop*
ubuntu/linux-gkeop-5.15*
ubuntu/linux-hwe-5.11*
ubuntu/linux-hwe-5.13*
ubuntu/linux-hwe-5.8*
ubuntu/linux-intel-5.13*
ubuntu/linux-oem-5.10*
ubuntu/linux-oem-5.13*
ubuntu/linux-oem-5.6*
ubuntu/linux-oracle-5.11*
ubuntu/linux-oracle-5.13*
ubuntu/linux-oracle-5.8*
ubuntu/linux-raspi2*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.11*
ubuntu/linux-riscv-5.8*
ubuntu/linux-aws-fips<5.4.0-1089.97+fips1
5.4.0-1089.97+fips1
ubuntu/linux-azure-fips<5.4.0-1095.101+fips1
5.4.0-1095.101+fips1
ubuntu/linux-fips<5.4.0-1065.74
5.4.0-1065.74
ubuntu/linux-gcp-fips<5.4.0-1093.102+fips1
5.4.0-1093.102+fips1
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.15.0-57.63
5.15.0-57.63
ubuntu/linux-allwinner-5.19*
ubuntu/linux-aws<5.15.0-1027.31
5.15.0-1027.31
ubuntu/linux-aws-5.19*
ubuntu/linux-aws-6.2*
ubuntu/linux-aws-6.5*
ubuntu/linux-azure<5.15.0-1030.37
5.15.0-1030.37
ubuntu/linux-azure-5.19*
ubuntu/linux-azure-6.2*
ubuntu/linux-azure-6.5*
ubuntu/linux-azure-fde<5.15.0-1030.37.1
5.15.0-1030.37.1
ubuntu/linux-azure-fde-5.19*
ubuntu/linux-azure-fde-6.2*
ubuntu/linux-gcp<5.15.0-1026.33
5.15.0-1026.33
ubuntu/linux-gcp-5.19*
ubuntu/linux-gcp-6.2*
ubuntu/linux-gcp-6.5*
ubuntu/linux-gke<5.15.0-1024.29
5.15.0-1024.29
ubuntu/linux-gkeop<5.15.0-1012.16
5.15.0-1012.16
ubuntu/linux-hwe-5.19*
ubuntu/linux-hwe-6.2*
ubuntu/linux-hwe-6.5*
ubuntu/linux-ibm<5.15.0-1022.25
5.15.0-1022.25
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-intel-iotg<5.15.0-1023.28
5.15.0-1023.28
ubuntu/linux-kvm<5.15.0-1025.30
5.15.0-1025.30
ubuntu/linux-lowlatency<5.15.0-57.63
5.15.0-57.63
ubuntu/linux-lowlatency-hwe-5.19*
ubuntu/linux-lowlatency-hwe-6.2*
ubuntu/linux-lowlatency-hwe-6.5*
ubuntu/linux-nvidia<5.15.0-1015.15
5.15.0-1015.15
ubuntu/linux-nvidia-6.2*
ubuntu/linux-nvidia-6.5*
ubuntu/linux-oem-5.17*
ubuntu/linux-oem-6.0*
ubuntu/linux-oem-6.1*
ubuntu/linux-oem-6.5*
ubuntu/linux-oracle<5.15.0-1026.32
5.15.0-1026.32
ubuntu/linux-oracle-6.5*
ubuntu/linux-raspi<5.15.0-1022.24
5.15.0-1022.24
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.19*
ubuntu/linux-riscv-6.5*
ubuntu/linux-starfive-5.19*
ubuntu/linux-starfive-6.2*
ubuntu/linux-starfive-6.5*
ubuntu/linux-realtime<5.15.0-1029.32
5.15.0-1029.32
ubuntu/linux-raspi-realtime*
ubuntu/linux-realtime*
ubuntu/linux-riscv*
linux/kernel>=4.0.0<4.9.327
4.9.327
linux/kernel>=4.10.0<4.14.292
4.14.292
linux/kernel>=4.15.0<4.19.257
4.19.257
linux/kernel>=4.20.0<5.4.212
5.4.212
linux/kernel>=5.5.0<5.10.141
5.10.141
linux/kernel>=5.11.0<5.15.65
5.15.65
linux/kernel>=5.16.0<5.19.6
5.19.6
debian/linux
6.1.176-16.1.190-16.12.107-16.12.115-27.2.15-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 6.0.2-1
  2. Upgrade

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    Fixed in 4.15.0-1158.173~14.04.1
  3. Upgrade

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    Fixed in 4.15.0-1147.159~16.04.1
  4. Upgrade

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    Fixed in 4.15.0-1159.174~16.04.1
  5. Upgrade

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    Fixed in 4.15.0-1142.158~16.04.1
  6. Upgrade

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    Fixed in 4.15.0-201.212~16.04.1
  7. Upgrade

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    Fixed in 4.15.0-1112.123~16.04.1
  8. Upgrade

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    Fixed in 4.15.0-201.212
  9. Upgrade

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    Fixed in 4.15.0-1147.159
  10. Upgrade

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    Fixed in 5.4.0-1089.97~18.04.1
  11. Upgrade

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    Fixed in 4.15.0-1158.173
  12. Upgrade

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    Fixed in 5.4.0-1095.101~18.04.1
  13. Upgrade

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    Fixed in 4.15.0-1142.158
  14. Upgrade

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    Fixed in 5.4.0-1093.102~18.04.1
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    Fixed in 5.4.0-132.148~18.04.1
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    Fixed in 5.4.0-1037.42~18.04.1
  17. Upgrade

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    Fixed in 4.15.0-1133.138
  18. Upgrade

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    Fixed in 4.15.0-1112.123
  19. Upgrade

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    Fixed in 5.4.0-1087.96~18.04.1
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    Fixed in 5.4.0-1074.85~18.04.1
  21. Upgrade

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    Fixed in 4.15.0-2087.93
  22. Upgrade

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    Fixed in 4.15.0-2067.73
  23. Upgrade

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    Fixed in 4.15.0-1104.115
  24. Upgrade

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    Fixed in 4.15.0-2052.57
  25. Upgrade

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    Fixed in 5.4.0-132.148
  26. Upgrade

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    Fixed in 5.4.0-1089.97
  27. Upgrade

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    Fixed in 5.15.0-1027.31~20.04.1
  28. Upgrade

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    Fixed in 5.4.0-1095.101
  29. Upgrade

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    Fixed in 5.15.0-1030.37~20.04.1
  30. Upgrade

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    Fixed in 5.4.0-1050.56
  31. Upgrade

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    Fixed in 5.4.0-1093.102
  32. Upgrade

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    Fixed in 5.15.0-1027.34~20.04.1
  33. Upgrade

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    Fixed in 5.15.0-57.63~20.04.1
  34. Upgrade

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    Fixed in 5.4.0-1037.42
  35. Upgrade

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    Fixed in 5.15.0-1023.28~20.04.1
  36. Upgrade

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    Fixed in 5.4.0-1006.8
  37. Upgrade

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    Fixed in 5.4.0-1079.85
  38. Upgrade

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    Fixed in 5.15.0-58.64~20.04.1
  39. Upgrade

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    Fixed in 5.4.0-1087.96
  40. Upgrade

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    Fixed in 5.15.0-1027.33~20.04.1
  41. Upgrade

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    Fixed in 5.4.0-1074.85
  42. Upgrade

    Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1027.31~20.04.1
  43. Upgrade

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    Fixed in 5.4.0-1089.97+fips1
  44. Upgrade

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    Fixed in 5.4.0-1095.101+fips1
  45. Upgrade

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    Fixed in 5.4.0-1065.74
  46. Upgrade

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    Fixed in 5.4.0-1093.102+fips1
  47. Upgrade

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    Fixed in 5.15.0-57.63
  48. Upgrade

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    Fixed in 5.15.0-1027.31
  49. Upgrade

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    Fixed in 5.15.0-1030.37
  50. Upgrade

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    Fixed in 5.15.0-1030.37.1
  51. Upgrade

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    Fixed in 5.15.0-1026.33
  52. Upgrade

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    Fixed in 5.15.0-1024.29
  53. Upgrade

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    Fixed in 5.15.0-1012.16
  54. Upgrade

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    Fixed in 5.15.0-1022.25
  55. Upgrade

    Upgrade ubuntu/linux-intel-iotg to a version that resolves this vulnerability.

    Fixed in 5.15.0-1023.28
  56. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 5.15.0-1025.30
  57. Upgrade

    Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.

    Fixed in 5.15.0-57.63
  58. Upgrade

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    Fixed in 5.15.0-1015.15
  59. Upgrade

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    Fixed in 5.15.0-1026.32
  60. Upgrade

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    Fixed in 5.15.0-1022.24
  61. Upgrade

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    Fixed in 5.15.0-1029.32
  62. Upgrade

    Upgrade linux/Kernel to a version that resolves this vulnerability.

    Fixed in 4.9.327
  63. Upgrade

    Upgrade linux/Kernel to a version that resolves this vulnerability.

    Fixed in 4.14.292
  64. Upgrade

    Upgrade linux/Kernel to a version that resolves this vulnerability.

    Fixed in 4.19.257
  65. Upgrade

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    Fixed in 5.4.212
  66. Upgrade

    Upgrade linux/Kernel to a version that resolves this vulnerability.

    Fixed in 5.10.141
  67. Upgrade

    Upgrade linux/Kernel to a version that resolves this vulnerability.

    Fixed in 5.15.65
  68. Upgrade

    Upgrade linux/Kernel to a version that resolves this vulnerability.

    Fixed in 5.19.6
  69. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.115-2Fixed in 7.2.15-1

Event History

Jun 18, 2025
CVE Published
via MITRE·11:01 AM
Data Sourced
via MITRE·11:01 AM
Description
Data Sourced
via OSV·11:01 AM
DescriptionAffected Software
Data Sourced
via OSV·11:15 AM
Severity
Data Sourced
via NVD·11:15 AM
RemedyDescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

1

What is the severity of CVE-2022-50008?

CVE-2022-50008 has a medium severity level due to the potential for incorrect behavior in kprobes.

2

How do I fix CVE-2022-50008?

To fix CVE-2022-50008, you should update your Linux kernel to the latest stable version where the vulnerability has been patched.

3

Which versions of the Linux kernel are affected by CVE-2022-50008?

CVE-2022-50008 affects certain versions of the Linux kernel prior to the fix being implemented.

4

What are the potential impacts of exploiting CVE-2022-50008?

Exploiting CVE-2022-50008 could lead to instability and unexpected behavior in systems utilizing kprobes.

5

Is CVE-2022-50008 a known issue in specific Linux distributions?

Yes, CVE-2022-50008 may impact several Linux distributions that rely on affected Linux kernel versions.

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