CVE-2024-36478: null_blk: fix null-ptr-dereference while configuring 'power' and 'submit_queues'

Published Jun 21, 2024
·
Updated

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

nullblk: fix null-ptr-dereference while configuring 'power' and 'submitqueues'

Writing 'power' and 'submitqueues' concurrently will trigger kernel panic:

Test script:

modprobe nullblk nrdevices=0 mkdir -p /sys/kernel/config/nullb/nullb0 while true; do echo 1 > submitqueues; echo 4 > submitqueues; done & while true; do echo 1 > power; echo 0 > power; done

Test result:

BUG: kernel NULL pointer dereference, address: 0000000000000148 Oops: 0000 [#1] PREEMPT SMP RIP: 0010:lockacquire+0x41d/0x28f0 Call Trace: <TASK> lockacquire+0x121/0x450 downwrite+0x5f/0x1d0 simplerecursiveremoval+0x12f/0x5c0 blkmqdebugfsunregisterhctxs+0x7c/0x100 blkmqupdatenrhwqueues+0x4a3/0x720 nullbupdatenrhwqueues+0x71/0xf0 [nullblk] nullbdevicesubmitqueuesstore+0x79/0xf0 [nullblk] configfswriteiter+0x119/0x1e0 vfswrite+0x326/0x730 ksyswrite+0x74/0x150

This is because delgendisk() can concurrent with blkmqupdatenrhwqueues():

nullbdevicepowerstore nullbapplysubmitqueues nulldeldev delgendisk nullbupdatenrhwqueues if (!dev->nullb) // still set while gendisk is deleted return 0 blkmqupdatenrhwqueues dev->nullb = NULL

Fix this problem by resuing the global mutex to protect nullbdevicepowerstore() and nullbupdatenrhwqueues() from configfs.

Affected Software

147 affected componentsFixes available
Linux Linux kernel>=5.5<6.9.4
Microsoft azl3 kernel 6.6.92.2-1
Patch available
Microsoft azl3 kernel 6.6.57.1-1
Patch available
ubuntu/linux-hwe-edge*
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-oem*
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-aws-5.11*
ubuntu/linux-aws-5.13*
ubuntu/linux-aws-5.15*
ubuntu/linux-aws-5.8*
ubuntu/linux-azure-5.11*
ubuntu/linux-azure-5.13*
ubuntu/linux-azure-5.15*
ubuntu/linux-azure-5.8*
ubuntu/linux-azure-fde*
ubuntu/linux-azure-fde-5.15*
ubuntu/linux-gcp-5.11*
ubuntu/linux-gcp-5.13*
ubuntu/linux-gcp-5.15*
ubuntu/linux-gcp-5.8*
ubuntu/linux-gke*
ubuntu/linux-gke-5.15*
ubuntu/linux-gkeop-5.15*
ubuntu/linux-hwe-5.11*
ubuntu/linux-hwe-5.13*
ubuntu/linux-hwe-5.15*
ubuntu/linux-hwe-5.8*
ubuntu/linux-ibm-5.15*
ubuntu/linux-intel-5.13*
ubuntu/linux-intel-iotg-5.15*
ubuntu/linux-lowlatency-hwe-5.15*
ubuntu/linux-nvidia-tegra-5.15*
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-5.15*
ubuntu/linux-oracle-5.8*
ubuntu/linux-raspi2*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.11*
ubuntu/linux-riscv-5.15*
ubuntu/linux-riscv-5.8*
ubuntu/linux*
ubuntu/linux-allwinner-5.19*
ubuntu/linux-aws*
ubuntu/linux-aws-5.19*
ubuntu/linux-aws-6.2*
ubuntu/linux-aws-6.5*
ubuntu/linux-aws-6.8<6.8.0-1015.16~22.04.1
6.8.0-1015.16~22.04.1
ubuntu/linux-azure*
ubuntu/linux-azure-5.19*
ubuntu/linux-azure-6.2*
ubuntu/linux-azure-6.5*
ubuntu/linux-azure-6.8<6.8.0-1014.16~22.04.1
6.8.0-1014.16~22.04.1
ubuntu/linux-azure-fde*
ubuntu/linux-azure-fde-5.19*
ubuntu/linux-azure-fde-6.2*
ubuntu/linux-gcp*
ubuntu/linux-gcp-5.19*
ubuntu/linux-gcp-6.2*
ubuntu/linux-gcp-6.5*
ubuntu/linux-gcp-6.8<6.8.0-1014.16~22.04.1
6.8.0-1014.16~22.04.1
ubuntu/linux-gke*
ubuntu/linux-gkeop*
ubuntu/linux-hwe-5.19*
ubuntu/linux-hwe-6.2*
ubuntu/linux-hwe-6.5*
ubuntu/linux-hwe-6.8<6.8.0-45.45~22.04.1
6.8.0-45.45~22.04.1
ubuntu/linux-ibm*
ubuntu/linux-ibm-6.8<6.8.0-1012.12~22.04.1
6.8.0-1012.12~22.04.1
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-intel-iotg*
ubuntu/linux-kvm*
ubuntu/linux-lowlatency*
ubuntu/linux-lowlatency-hwe-5.19*
ubuntu/linux-lowlatency-hwe-6.2*
ubuntu/linux-lowlatency-hwe-6.5*
ubuntu/linux-lowlatency-hwe-6.8<6.8.0-44.44.1~22.04.1
6.8.0-44.44.1~22.04.1
ubuntu/linux-nvidia*
ubuntu/linux-nvidia-6.2*
ubuntu/linux-nvidia-6.5*
ubuntu/linux-nvidia-6.8<6.8.0-1013.14~22.04.1
6.8.0-1013.14~22.04.1
ubuntu/linux-nvidia-tegra*
ubuntu/linux-nvidia-tegra-igx*
ubuntu/linux-oem-5.17*
ubuntu/linux-oem-6.0*
ubuntu/linux-oem-6.1*
ubuntu/linux-oem-6.5*
ubuntu/linux-oracle*
ubuntu/linux-oracle-6.5*
ubuntu/linux-oracle-6.8<6.8.0-1012.12~22.04.1
6.8.0-1012.12~22.04.1
ubuntu/linux-raspi*
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.19*
ubuntu/linux-riscv-6.5*
ubuntu/linux-riscv-6.8<6.8.0-44.44.1~22.04.1
6.8.0-44.44.1~22.04.1
ubuntu/linux-starfive-5.19*
ubuntu/linux-starfive-6.2*
ubuntu/linux-starfive-6.5*
ubuntu/linux-xilinx-zynqmp*
ubuntu/linux-bluefield*
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-realtime*
ubuntu/linux-realtime-6.8<6.8.1-1008.8~22.04.1
6.8.1-1008.8~22.04.1
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<6.8.0-44.44
6.8.0-44.44
ubuntu/linux-aws<6.8.0-1015.16
6.8.0-1015.16
ubuntu/linux-azure<6.8.0-1014.16
6.8.0-1014.16
ubuntu/linux-gcp<6.8.0-1014.16
6.8.0-1014.16
ubuntu/linux-gke<6.8.0-1010.13
6.8.0-1010.13
ubuntu/linux-ibm<6.8.0-1012.12
6.8.0-1012.12
ubuntu/linux-lowlatency<6.8.0-44.44.1
6.8.0-44.44.1
ubuntu/linux-nvidia<6.8.0-1013.14
6.8.0-1013.14
ubuntu/linux-nvidia-lowlatency<6.8.0-1013.14.1
6.8.0-1013.14.1
ubuntu/linux-oem-6.8<6.8.0-1012.12
6.8.0-1012.12
ubuntu/linux-oracle<6.8.0-1012.12
6.8.0-1012.12
ubuntu/linux-raspi<6.8.0-1011.12
6.8.0-1011.12
ubuntu/linux-riscv<6.8.0-44.44.1
6.8.0-44.44.1
ubuntu/linux-raspi-realtime<6.8.0-2010.10
6.8.0-2010.10
ubuntu/linux-realtime<6.8.1-1008.8
6.8.1-1008.8
ubuntu/linux-fips<6.8.0-78.78+fips1
6.8.0-78.78+fips1
debian/linux<6.1.119-1
6.1.119-1
debian/linux<6.9.7-1
6.9.7-1
debian/linux<6.9.7-1
6.9.7-1
debian/linux
6.1.176-16.1.190-16.12.107-16.12.115-27.2.12-17.2.15-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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

    Fixed in 6.1.129-1Fixed in 6.1.135-1Fixed in 6.12.22-1Fixed in 6.12.25-1
  2. Upgrade

    Upgrade debian/linux-6.1 to a version that resolves this vulnerability.

    Fixed in 6.1.129-1~deb11u1
  3. Upgrade

    Upgrade ubuntu/linux-aws-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1015.16~22.04.1
  4. Upgrade

    Upgrade ubuntu/linux-azure-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1014.16~22.04.1
  5. Upgrade

    Upgrade ubuntu/linux-gcp-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1014.16~22.04.1
  6. Upgrade

    Upgrade ubuntu/linux-hwe-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-45.45~22.04.1
  7. Upgrade

    Upgrade ubuntu/linux-ibm-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1012.12~22.04.1
  8. Upgrade

    Upgrade ubuntu/linux-lowlatency-hwe-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-44.44.1~22.04.1
  9. Upgrade

    Upgrade ubuntu/linux-nvidia-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1013.14~22.04.1
  10. Upgrade

    Upgrade ubuntu/linux-oracle-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1012.12~22.04.1
  11. Upgrade

    Upgrade ubuntu/linux-riscv-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-44.44.1~22.04.1
  12. Upgrade

    Upgrade ubuntu/linux-realtime-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.1-1008.8~22.04.1
  13. Upgrade

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

    Fixed in 6.8.0-44.44
  14. Upgrade

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

    Fixed in 6.8.0-1015.16
  15. Upgrade

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

    Fixed in 6.8.0-1014.16
  16. Upgrade

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

    Fixed in 6.8.0-1014.16
  17. Upgrade

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

    Fixed in 6.8.0-1010.13
  18. Upgrade

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

    Fixed in 6.8.0-1012.12
  19. Upgrade

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

    Fixed in 6.8.0-44.44.1
  20. Upgrade

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

    Fixed in 6.8.0-1013.14
  21. Upgrade

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

    Fixed in 6.8.0-1013.14.1
  22. Upgrade

    Upgrade ubuntu/linux-oem-6.8 to a version that resolves this vulnerability.

    Fixed in 6.8.0-1012.12
  23. Upgrade

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

    Fixed in 6.8.0-1012.12
  24. Upgrade

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

    Fixed in 6.8.0-1011.12
  25. Upgrade

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

    Fixed in 6.8.0-44.44.1
  26. Upgrade

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

    Fixed in 6.8.0-2010.10
  27. Upgrade

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

    Fixed in 6.8.1-1008.8
  28. Upgrade

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

    Fixed in 6.8.0-78.78+fips1
  29. Compensating control

    Reuse the global mutex to protect nullb_device_power_store() and nullb_update_nr_hw_queues() when accessed from configfs, preventing del_gendisk() from racing with blk_mq_update_nr_hw_queues().

Event History

Jun 21, 2024
CVE Published
via MITRE·10:18 AM
Data Sourced
via MITRE·10:18 AM
Description
Data Sourced
via OSV·11:15 AM
DescriptionSeverityAffected Software
Data Sourced
via NVD·11:15 AM
RemedyDescriptionSeverityWeaknessAffected Software
Nov 9, 2024
Data Sourced
via Microsoft·08:00 AM
DescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is the severity of CVE-2024-36478?

CVE-2024-36478 has been classified as a critical vulnerability due to its potential to trigger a kernel panic.

2

How do I fix CVE-2024-36478?

To remediate CVE-2024-36478, update the Linux kernel to version 6.1.123-1, 6.1.128-1, 6.12.12-1, or 6.12.13-1.

3

Which versions of the Linux kernel are affected by CVE-2024-36478?

CVE-2024-36478 affects versions of the Linux kernel between 5.5 and 6.9.4.

4

What conditions trigger the CVE-2024-36478 vulnerability?

The CVE-2024-36478 vulnerability can be triggered when 'power' and 'submit_queues' are written concurrently.

5

Is there a specific distribution affected by CVE-2024-36478?

Yes, Debian-based distributions are affected, particularly those using kernel versions up to 5.10.226-1.

Company

Resources

Contact

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