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CVE-2022-50731: Linux kernel may crash setting private key on some algorithms
CVE-2022-50731 · published 10 months ago
Summary
The Linux kernel versions used in Ubuntu cloud images can crash if software tries to set a private key for certain cryptographic functions that only support verification, such as ECDSA. The update removes a missing safety check so the operation now fails gracefully instead of stopping the system. Apply the latest kernel updates for the listed Ubuntu packages to protect your servers.
What to do
- Update canonical linux-aws-5.4 to version 5.4.0-1096.104~18.04.1.
- Update canonical linux-azure-5.4 to version 5.4.0-1103.109~18.04.1.
- Update canonical linux-gcp-5.4 to version 5.4.0-1100.109~18.04.1.
- Update canonical linux-hwe-5.4 to version 5.4.0-139.156~18.04.1.
- Update canonical linux-ibm-5.4 to version 5.4.0-1044.49~18.04.1.
- Update canonical linux-oracle-5.4 to version 5.4.0-1093.102~18.04.1.
- Update canonical linux-raspi-5.4 to version 5.4.0-1080.91~18.04.1.
- Update canonical linux to version 5.4.0-139.156.
- Update canonical linux-aws to version 5.4.0-1096.104.
- Update canonical linux-aws-5.15 to version 5.15.0-1030.34~20.04.1.
- Update canonical linux-azure to version 5.4.0-1103.109.
- Update canonical linux-azure-5.15 to version 5.15.0-1033.40~20.04.1.
- Update canonical linux-bluefield to version 5.4.0-1058.64.
- Update canonical linux-gcp to version 5.4.0-1100.109.
- Update canonical linux-gcp-5.15 to version 5.15.0-1029.36~20.04.1.
- Update canonical linux-hwe-5.15 to version 5.15.0-60.66~20.04.1.
- Update canonical linux-ibm to version 5.4.0-1044.49.
- Update canonical linux-intel-iotg-5.15 to version 5.15.0-1025.30~20.04.1.
- Update canonical linux-iot to version 5.4.0-1012.14.
- Update canonical linux-kvm to version 5.4.0-1086.92.
- Update canonical linux-lowlatency-hwe-5.15 to version 5.15.0-60.66~20.04.1.
- Update canonical linux-oracle to version 5.4.0-1093.102.
- Update canonical linux-oracle-5.15 to version 5.15.0-1029.35~20.04.1.
- Update canonical linux-raspi to version 5.4.0-1080.91.
- Update canonical linux-riscv-5.15 to version 5.15.0-1029.33~20.04.1.
- Update canonical linux-xilinx-zynqmp to version 5.4.0-1021.25.
- Update canonical linux-aws-fips to version 5.4.0-1096.104+fips1.
- Update canonical linux-azure-fips to version 5.4.0-1103.109+fips1.
- Update canonical linux-fips to version 5.4.0-1072.81.
- Update canonical linux-gcp-fips to version 5.4.0-1100.109+fips1.
- Update canonical linux to version 5.15.0-60.66.
- Update canonical linux-aws to version 5.15.0-1030.34.
- Update canonical linux-azure to version 5.15.0-1033.40.
- Update canonical linux-gcp to version 5.15.0-1029.36.
- Update canonical linux-gke to version 5.15.0-1027.32.
- Update canonical linux-gkeop to version 5.15.0-1015.19.
- Update canonical linux-ibm to version 5.15.0-1025.28.
- Update canonical linux-intel-iotg to version 5.15.0-1025.30.
- Update canonical linux-kvm to version 5.15.0-1028.33.
- Update canonical linux-lowlatency to version 5.15.0-60.66.
- Update canonical linux-nvidia to version 5.15.0-1017.17.
- Update canonical linux-oracle to version 5.15.0-1029.35.
- Update canonical linux-raspi to version 5.15.0-1024.26.
- Update canonical linux-bluefield to version 5.15.0-1014.16.
- Update canonical linux-azure-fde to version 5.15.0-1033.40.1.
- Update debian linux to version 6.0.3-1.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Ubuntu:16.04:LTS | canonical | linux-hwe-edge | All versions |
| Ubuntu:18.04:LTS | canonical | linux-aws-5.4 |
< 5.4.0-1096.104~18.04.1 Fix: upgrade to 5.4.0-1096.104~18.04.1
|
| Ubuntu:18.04:LTS | canonical | linux-azure-5.4 |
< 5.4.0-1103.109~18.04.1 Fix: upgrade to 5.4.0-1103.109~18.04.1
|
| Ubuntu:18.04:LTS | canonical | linux-gcp-5.4 |
< 5.4.0-1100.109~18.04.1 Fix: upgrade to 5.4.0-1100.109~18.04.1
|
| Ubuntu:18.04:LTS | canonical | linux-hwe-5.4 |
< 5.4.0-139.156~18.04.1 Fix: upgrade to 5.4.0-139.156~18.04.1
|
| Ubuntu:18.04:LTS | canonical | linux-ibm-5.4 |
< 5.4.0-1044.49~18.04.1 Fix: upgrade to 5.4.0-1044.49~18.04.1
|
| Ubuntu:18.04:LTS | canonical | linux-oracle-5.4 |
< 5.4.0-1093.102~18.04.1 Fix: upgrade to 5.4.0-1093.102~18.04.1
|
| Ubuntu:18.04:LTS | canonical | linux-raspi-5.4 |
< 5.4.0-1080.91~18.04.1 Fix: upgrade to 5.4.0-1080.91~18.04.1
|
| Ubuntu:18.04:LTS | canonical | linux-aws-5.0 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-aws-5.3 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-azure | All versions |
| Ubuntu:18.04:LTS | canonical | linux-azure-5.3 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-azure-edge | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gcp | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gcp-5.3 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gke-4.15 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gke-5.4 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gkeop-5.4 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-hwe | All versions |
| Ubuntu:18.04:LTS | canonical | linux-oem | All versions |
| Ubuntu:18.04:LTS | canonical | linux-oracle-5.0 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-oracle-5.3 | All versions |
| Ubuntu:20.04:LTS | canonical | linux |
< 5.4.0-139.156 Fix: upgrade to 5.4.0-139.156
|
| Ubuntu:20.04:LTS | canonical | linux-aws |
< 5.4.0-1096.104 Fix: upgrade to 5.4.0-1096.104
|
| Ubuntu:20.04:LTS | canonical | linux-aws-5.15 |
< 5.15.0-1030.34~20.04.1 Fix: upgrade to 5.15.0-1030.34~20.04.1
|
| Ubuntu:20.04:LTS | canonical | linux-azure |
< 5.4.0-1103.109 Fix: upgrade to 5.4.0-1103.109
|
| Ubuntu:20.04:LTS | canonical | linux-azure-5.15 |
< 5.15.0-1033.40~20.04.1 Fix: upgrade to 5.15.0-1033.40~20.04.1
|
| Ubuntu:20.04:LTS | canonical | linux-bluefield |
< 5.4.0-1058.64 Fix: upgrade to 5.4.0-1058.64
|
| Ubuntu:20.04:LTS | canonical | linux-gcp |
< 5.4.0-1100.109 Fix: upgrade to 5.4.0-1100.109
|
| Ubuntu:20.04:LTS | canonical | linux-gcp-5.15 |
< 5.15.0-1029.36~20.04.1 Fix: upgrade to 5.15.0-1029.36~20.04.1
|
| Ubuntu:20.04:LTS | canonical | linux-hwe-5.15 |
< 5.15.0-60.66~20.04.1 Fix: upgrade to 5.15.0-60.66~20.04.1
|
| Ubuntu:20.04:LTS | canonical | linux-ibm |
< 5.4.0-1044.49 Fix: upgrade to 5.4.0-1044.49
|
| Ubuntu:20.04:LTS | canonical | linux-intel-iotg-5.15 |
< 5.15.0-1025.30~20.04.1 Fix: upgrade to 5.15.0-1025.30~20.04.1
|
| Ubuntu:20.04:LTS | canonical | linux-iot |
< 5.4.0-1012.14 Fix: upgrade to 5.4.0-1012.14
|
| Ubuntu:20.04:LTS | canonical | linux-kvm |
< 5.4.0-1086.92 Fix: upgrade to 5.4.0-1086.92
|
| Ubuntu:20.04:LTS | canonical | linux-lowlatency-hwe-5.15 |
< 5.15.0-60.66~20.04.1 Fix: upgrade to 5.15.0-60.66~20.04.1
|
| Ubuntu:20.04:LTS | canonical | linux-oracle |
< 5.4.0-1093.102 Fix: upgrade to 5.4.0-1093.102
|
| Ubuntu:20.04:LTS | canonical | linux-oracle-5.15 |
< 5.15.0-1029.35~20.04.1 Fix: upgrade to 5.15.0-1029.35~20.04.1
|
| Ubuntu:20.04:LTS | canonical | linux-raspi |
< 5.4.0-1080.91 Fix: upgrade to 5.4.0-1080.91
|
| Ubuntu:20.04:LTS | canonical | linux-riscv-5.15 |
< 5.15.0-1029.33~20.04.1 Fix: upgrade to 5.15.0-1029.33~20.04.1
|
| Ubuntu:20.04:LTS | canonical | linux-xilinx-zynqmp |
< 5.4.0-1021.25 Fix: upgrade to 5.4.0-1021.25
|
| Ubuntu:20.04:LTS | canonical | linux-aws-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-aws-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-aws-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-azure-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-azure-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-azure-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-azure-fde | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gcp-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gcp-5.13 | All versions |
Showing 50 of 135. Show the rest
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Ubuntu:20.04:LTS | canonical | linux-gcp-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gke | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gke-5.15 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gkeop | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gkeop-5.15 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-hwe-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-hwe-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-hwe-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-intel-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oem-5.10 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oem-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oem-5.14 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oem-5.6 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oracle-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oracle-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oracle-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-raspi2 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-riscv | All versions |
| Ubuntu:20.04:LTS | canonical | linux-riscv-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-riscv-5.8 | All versions |
| Ubuntu:Pro:FIPS-updates:20.04:LTS | canonical | linux-aws-fips |
< 5.4.0-1096.104+fips1 Fix: upgrade to 5.4.0-1096.104+fips1
|
| Ubuntu:Pro:FIPS-updates:20.04:LTS | canonical | linux-azure-fips |
< 5.4.0-1103.109+fips1 Fix: upgrade to 5.4.0-1103.109+fips1
|
| Ubuntu:Pro:FIPS-updates:20.04:LTS | canonical | linux-fips |
< 5.4.0-1072.81 Fix: upgrade to 5.4.0-1072.81
|
| Ubuntu:Pro:FIPS-updates:20.04:LTS | canonical | linux-gcp-fips |
< 5.4.0-1100.109+fips1 Fix: upgrade to 5.4.0-1100.109+fips1
|
| Ubuntu:Pro:FIPS:20.04:LTS | canonical | linux-aws-fips | All versions |
| Ubuntu:Pro:FIPS:20.04:LTS | canonical | linux-azure-fips | All versions |
| Ubuntu:Pro:FIPS:20.04:LTS | canonical | linux-fips | All versions |
| Ubuntu:Pro:FIPS:20.04:LTS | canonical | linux-gcp-fips | All versions |
| Ubuntu:22.04:LTS | canonical | linux |
< 5.15.0-60.66 Fix: upgrade to 5.15.0-60.66
|
| Ubuntu:22.04:LTS | canonical | linux-allwinner-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-aws |
< 5.15.0-1030.34 Fix: upgrade to 5.15.0-1030.34
|
| Ubuntu:22.04:LTS | canonical | linux-aws-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-aws-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-aws-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure |
< 5.15.0-1033.40 Fix: upgrade to 5.15.0-1033.40
|
| Ubuntu:22.04:LTS | canonical | linux-azure-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-fde-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-fde-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-gcp |
< 5.15.0-1029.36 Fix: upgrade to 5.15.0-1029.36
|
| Ubuntu:22.04:LTS | canonical | linux-gcp-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-gcp-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-gcp-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-gke |
< 5.15.0-1027.32 Fix: upgrade to 5.15.0-1027.32
|
| Ubuntu:22.04:LTS | canonical | linux-gkeop |
< 5.15.0-1015.19 Fix: upgrade to 5.15.0-1015.19
|
| Ubuntu:22.04:LTS | canonical | linux-hwe-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-hwe-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-hwe-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-ibm |
< 5.15.0-1025.28 Fix: upgrade to 5.15.0-1025.28
|
| Ubuntu:22.04:LTS | canonical | linux-intel-iot-realtime | All versions |
| Ubuntu:22.04:LTS | canonical | linux-intel-iotg |
< 5.15.0-1025.30 Fix: upgrade to 5.15.0-1025.30
|
| Ubuntu:22.04:LTS | canonical | linux-kvm |
< 5.15.0-1028.33 Fix: upgrade to 5.15.0-1028.33
|
| Ubuntu:22.04:LTS | canonical | linux-lowlatency |
< 5.15.0-60.66 Fix: upgrade to 5.15.0-60.66
|
| Ubuntu:22.04:LTS | canonical | linux-lowlatency-hwe-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-lowlatency-hwe-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-lowlatency-hwe-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-nvidia |
< 5.15.0-1017.17 Fix: upgrade to 5.15.0-1017.17
|
| Ubuntu:22.04:LTS | canonical | linux-nvidia-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-nvidia-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oem-5.17 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oem-6.0 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oem-6.1 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oem-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oracle |
< 5.15.0-1029.35 Fix: upgrade to 5.15.0-1029.35
|
| Ubuntu:22.04:LTS | canonical | linux-oracle-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-raspi |
< 5.15.0-1024.26 Fix: upgrade to 5.15.0-1024.26
|
| Ubuntu:22.04:LTS | canonical | linux-realtime | All versions |
| Ubuntu:22.04:LTS | canonical | linux-riscv-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-riscv-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-starfive-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-starfive-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-starfive-6.5 | All versions |
| Ubuntu:Nvidia-BlueField:22.04:LTS | canonical | linux-bluefield |
< 5.15.0-1014.16 Fix: upgrade to 5.15.0-1014.16
|
| Ubuntu:24.04:LTS | canonical | linux-azure-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-gcp-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-hwe-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-lowlatency-hwe-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-nvidia-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-oem-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-oem-6.8 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-raspi-realtime | All versions |
| Ubuntu:24.04:LTS | canonical | linux-riscv-6.14 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-fde |
< 5.15.0-1033.40.1 Fix: upgrade to 5.15.0-1033.40.1
|
| Debian:12 | debian | linux |
< 6.0.3-1 Fix: upgrade to 6.0.3-1
|
Original advisory text
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 ...
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 set_pub_key: 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 set_priv_key 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.
References
- https://git.kernel.org/stable/c/779a9930f3e152c82699feb389a0e6d6644e747e Third Party Advisory
- https://git.kernel.org/stable/c/85bc736a18b872f54912e8bb70682d11770aece0 Third Party Advisory
- https://git.kernel.org/stable/c/95c4e20adc3ea00d1594a2a05d9b187ed12ffa8e Third Party Advisory
- https://git.kernel.org/stable/c/a1354bdd191d533211b7cb723aa76a66f516f197 Third Party Advisory
- https://ubuntu.com/security/CVE-2022-50731 Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2022-50731 Third Party Advisory
- https://git.kernel.org/stable/c/bc155c6c188c2f0c5749993b1405673d25a80389 Third Party Advisory
- https://git.kernel.org/stable/c/f9058178597059d6307efe96a7916600f8ede08c Third Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2022-50731 Vendor Advisory
Timeline
Published24 Dec 2025
Updated4 Nov 2026
First seen7 Mar 2026
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