CVE-2022-50731: crypto: akcipher - default implementation for setting a private key

Published Dec 24, 2025
·
Updated

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

crypto: akcipher - default implementation for setting a private key

Changes from v1: removed the default implementation from setpubkey: it is assumed that an implementation must always have this callback defined as there are no use case for an algorithm, which doesn't need a public key

Many akcipher implementations (like ECDSA) support only signature verifications, so they don't have all callbacks defined.

Commit 78a0324f4a53 ("crypto: akcipher - default implementations for request callbacks") introduced default callbacks for sign/verify operations, which just return an error code.

However, these are not enough, because before calling sign the caller would likely call setprivkey first on the instantiated transform (as the in-kernel testmgr does). This function does not have a default stub, so the kernel crashes, when trying to set a private key on an akcipher, which doesn't support signature generation.

I've noticed this, when trying to add a KAT vector for ECDSA signature to the testmgr.

With this patch the testmgr returns an error in dmesg (as it should) instead of crashing the kernel NULL ptr dereference.

Affected Software

148 affected componentsFixes available
linux/kernel
debian/linux<6.0.3-1
6.0.3-1
debian/linux<6.0.3-1
6.0.3-1
debian/linux<6.0.3-1
6.0.3-1
ubuntu/linux-hwe-edge*
ubuntu/linux-aws-5.4<5.4.0-1096.104~18.04.1
5.4.0-1096.104~18.04.1
ubuntu/linux-azure-5.4<5.4.0-1103.109~18.04.1
5.4.0-1103.109~18.04.1
ubuntu/linux-gcp-5.4<5.4.0-1100.109~18.04.1
5.4.0-1100.109~18.04.1
ubuntu/linux-hwe-5.4<5.4.0-139.156~18.04.1
5.4.0-139.156~18.04.1
ubuntu/linux-ibm-5.4<5.4.0-1044.49~18.04.1
5.4.0-1044.49~18.04.1
ubuntu/linux-oracle-5.4<5.4.0-1093.102~18.04.1
5.4.0-1093.102~18.04.1
ubuntu/linux-raspi-5.4<5.4.0-1080.91~18.04.1
5.4.0-1080.91~18.04.1
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<5.4.0-139.156
5.4.0-139.156
ubuntu/linux-aws<5.4.0-1096.104
5.4.0-1096.104
ubuntu/linux-aws-5.15<5.15.0-1030.34~20.04.1
5.15.0-1030.34~20.04.1
ubuntu/linux-azure<5.4.0-1103.109
5.4.0-1103.109
ubuntu/linux-azure-5.15<5.15.0-1033.40~20.04.1
5.15.0-1033.40~20.04.1
ubuntu/linux-bluefield<5.4.0-1058.64
5.4.0-1058.64
ubuntu/linux-gcp<5.4.0-1100.109
5.4.0-1100.109
ubuntu/linux-gcp-5.15<5.15.0-1029.36~20.04.1
5.15.0-1029.36~20.04.1
ubuntu/linux-hwe-5.15<5.15.0-60.66~20.04.1
5.15.0-60.66~20.04.1
ubuntu/linux-ibm<5.4.0-1044.49
5.4.0-1044.49
ubuntu/linux-intel-iotg-5.15<5.15.0-1025.30~20.04.1
5.15.0-1025.30~20.04.1
ubuntu/linux-iot<5.4.0-1012.14
5.4.0-1012.14
ubuntu/linux-kvm<5.4.0-1086.92
5.4.0-1086.92
ubuntu/linux-lowlatency-hwe-5.15<5.15.0-60.66~20.04.1
5.15.0-60.66~20.04.1
ubuntu/linux-oracle<5.4.0-1093.102
5.4.0-1093.102
ubuntu/linux-oracle-5.15<5.15.0-1029.35~20.04.1
5.15.0-1029.35~20.04.1
ubuntu/linux-raspi<5.4.0-1080.91
5.4.0-1080.91
ubuntu/linux-riscv-5.15<5.15.0-1029.33~20.04.1
5.15.0-1029.33~20.04.1
ubuntu/linux-xilinx-zynqmp<5.4.0-1021.25
5.4.0-1021.25
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<5.4.0-1096.104+fips1
5.4.0-1096.104+fips1
ubuntu/linux-azure-fips<5.4.0-1103.109+fips1
5.4.0-1103.109+fips1
ubuntu/linux-fips<5.4.0-1072.81
5.4.0-1072.81
ubuntu/linux-gcp-fips<5.4.0-1100.109+fips1
5.4.0-1100.109+fips1
ubuntu/linux-aws-fips*
ubuntu/linux-azure-fips*
ubuntu/linux-fips*
ubuntu/linux-gcp-fips*
ubuntu/linux<5.15.0-60.66
5.15.0-60.66
ubuntu/linux-allwinner-5.19*
ubuntu/linux-aws<5.15.0-1030.34
5.15.0-1030.34
ubuntu/linux-aws-5.19*
ubuntu/linux-aws-6.2*
ubuntu/linux-aws-6.5*
ubuntu/linux-azure<5.15.0-1033.40
5.15.0-1033.40
ubuntu/linux-azure-5.19*
ubuntu/linux-azure-6.2*
ubuntu/linux-azure-6.5*
ubuntu/linux-azure-fde<5.15.0-1033.40.1
5.15.0-1033.40.1
ubuntu/linux-azure-fde-5.19*
ubuntu/linux-azure-fde-6.2*
ubuntu/linux-gcp<5.15.0-1029.36
5.15.0-1029.36
ubuntu/linux-gcp-5.19*
ubuntu/linux-gcp-6.2*
ubuntu/linux-gcp-6.5*
ubuntu/linux-gke<5.15.0-1027.32
5.15.0-1027.32
ubuntu/linux-gkeop<5.15.0-1015.19
5.15.0-1015.19
ubuntu/linux-hwe-5.19*
ubuntu/linux-hwe-6.2*
ubuntu/linux-hwe-6.5*
ubuntu/linux-ibm<5.15.0-1025.28
5.15.0-1025.28
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-intel-iotg<5.15.0-1025.30
5.15.0-1025.30
ubuntu/linux-kvm<5.15.0-1028.33
5.15.0-1028.33
ubuntu/linux-lowlatency<5.15.0-60.66
5.15.0-60.66
ubuntu/linux-lowlatency-hwe-5.19*
ubuntu/linux-lowlatency-hwe-6.2*
ubuntu/linux-lowlatency-hwe-6.5*
ubuntu/linux-nvidia<5.15.0-1017.17
5.15.0-1017.17
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<5.15.0-1029.35
5.15.0-1029.35
ubuntu/linux-oracle-6.5*
ubuntu/linux-raspi<5.15.0-1024.26
5.15.0-1024.26
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-bluefield<5.15.0-1014.16
5.15.0-1014.16
ubuntu/linux-azure-6.11*
ubuntu/linux-gcp-6.11*
ubuntu/linux-hwe-6.11*
ubuntu/linux-lowlatency-hwe-6.11*
ubuntu/linux-nvidia-6.11*
ubuntu/linux-oem-6.11*
ubuntu/linux-oem-6.8*
ubuntu/linux-raspi-realtime*
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-riscv-6.14*
ubuntu/linux-vmware*
linux/kernel>=5.2.0<5.4.220
5.4.220
linux/kernel>=5.5.0<5.10.150
5.10.150
linux/kernel>=5.11.0<5.15.75
5.15.75
linux/kernel>=5.16.0<5.19.17
5.19.17
linux/kernel>=5.20.0<6.0.3
6.0.3
debian/linux
6.1.176-16.1.190-16.12.107-16.12.116-17.2.15-17.3.4-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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

    Fixed in 6.0.3-1
  2. Upgrade

    Upgrade ubuntu/linux-aws-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1096.104~18.04.1
  3. Upgrade

    Upgrade ubuntu/linux-azure-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1103.109~18.04.1
  4. Upgrade

    Upgrade ubuntu/linux-gcp-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1100.109~18.04.1
  5. Upgrade

    Upgrade ubuntu/linux-hwe-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-139.156~18.04.1
  6. Upgrade

    Upgrade ubuntu/linux-ibm-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1044.49~18.04.1
  7. Upgrade

    Upgrade ubuntu/linux-oracle-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1093.102~18.04.1
  8. Upgrade

    Upgrade ubuntu/linux-raspi-5.4 to a version that resolves this vulnerability.

    Fixed in 5.4.0-1080.91~18.04.1
  9. Upgrade

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

    Fixed in 5.4.0-139.156
  10. Upgrade

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

    Fixed in 5.4.0-1096.104
  11. Upgrade

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

    Fixed in 5.15.0-1030.34~20.04.1
  12. Upgrade

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

    Fixed in 5.4.0-1103.109
  13. Upgrade

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

    Fixed in 5.15.0-1033.40~20.04.1
  14. Upgrade

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

    Fixed in 5.4.0-1058.64
  15. Upgrade

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

    Fixed in 5.4.0-1100.109
  16. Upgrade

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

    Fixed in 5.15.0-1029.36~20.04.1
  17. Upgrade

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

    Fixed in 5.15.0-60.66~20.04.1
  18. Upgrade

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

    Fixed in 5.4.0-1044.49
  19. Upgrade

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

    Fixed in 5.15.0-1025.30~20.04.1
  20. Upgrade

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

    Fixed in 5.4.0-1012.14
  21. Upgrade

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

    Fixed in 5.4.0-1086.92
  22. Upgrade

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

    Fixed in 5.15.0-60.66~20.04.1
  23. Upgrade

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

    Fixed in 5.4.0-1093.102
  24. Upgrade

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

    Fixed in 5.15.0-1029.35~20.04.1
  25. Upgrade

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

    Fixed in 5.4.0-1080.91
  26. Upgrade

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

    Fixed in 5.15.0-1029.33~20.04.1
  27. Upgrade

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

    Fixed in 5.4.0-1021.25
  28. Upgrade

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

    Fixed in 5.4.0-1096.104+fips1
  29. Upgrade

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

    Fixed in 5.4.0-1103.109+fips1
  30. Upgrade

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

    Fixed in 5.4.0-1072.81
  31. Upgrade

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

    Fixed in 5.4.0-1100.109+fips1
  32. Upgrade

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

    Fixed in 5.15.0-60.66
  33. Upgrade

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

    Fixed in 5.15.0-1030.34
  34. Upgrade

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

    Fixed in 5.15.0-1033.40
  35. Upgrade

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

    Fixed in 5.15.0-1033.40.1
  36. Upgrade

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

    Fixed in 5.15.0-1029.36
  37. Upgrade

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

    Fixed in 5.15.0-1027.32
  38. Upgrade

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

    Fixed in 5.15.0-1015.19
  39. Upgrade

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

    Fixed in 5.15.0-1025.28
  40. Upgrade

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

    Fixed in 5.15.0-1025.30
  41. Upgrade

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

    Fixed in 5.15.0-1028.33
  42. Upgrade

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

    Fixed in 5.15.0-60.66
  43. Upgrade

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

    Fixed in 5.15.0-1017.17
  44. Upgrade

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

    Fixed in 5.15.0-1029.35
  45. Upgrade

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

    Fixed in 5.15.0-1024.26
  46. Upgrade

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

    Fixed in 5.15.0-1014.16
  47. Upgrade

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

    Fixed in 5.4.220
  48. Upgrade

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

    Fixed in 5.10.150
  49. Upgrade

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

    Fixed in 5.15.75
  50. Upgrade

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

    Fixed in 5.19.17
  51. Upgrade

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

    Fixed in 6.0.3
  52. 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 6.12.116-1Fixed in 7.2.15-1Fixed in 7.3.4-1

Event History

Dec 24, 2025
CVE Published
via MITRE·12:22 PM
Data Sourced
via MITRE·12:22 PM
Description
Data Sourced
via OSV·12:22 PM
DescriptionAffected Software
Data Sourced
via NVD·01:15 PM
Description
Nov 11, 2026
Data Sourced
via OSV·09:37 AM
Severity

Frequently Asked Questions

1

What is the severity of CVE-2022-50731?

CVE-2022-50731 is classified as a critical severity vulnerability impacting the Linux kernel.

2

How do I fix CVE-2022-50731?

To fix CVE-2022-50731, update the Linux kernel to the latest patched version provided by your distribution.

3

What systems are affected by CVE-2022-50731?

CVE-2022-50731 affects various Linux kernel versions, particularly those using the affected crypto functions.

4

What type of vulnerability is CVE-2022-50731?

CVE-2022-50731 is a vulnerability related to improper implementation in the Linux kernel's crypto subsystem.

5

What impact does CVE-2022-50731 have on security?

CVE-2022-50731 can potentially allow unauthorized access to cryptographic keys, leading to serious security risks.

Company

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