🛡️ CVE-2023-4622 on Ubuntu — linux
Description
A use-after-free vulnerability in the Linux kernel's af_unix component can be exploited to achieve local privilege escalation. The unix_stream_sendpage() function tries to add data to the last skb in the peer's recv queue without locking the queue. Thus there is a race where unix_stream_sendpage() could access an skb locklessly that is being released by garbage collection, resulting in use-after-free. We recommend upgrading past commit 790c2f9d15b594350ae9bca7b236f2b1859de02c.
Distribution advisory
This page covers CVE-2023-4622 as tracked by Ubuntu, for the package linux. The fix is available in version 5.15.0-87.97; earlier versions remain affected.
How this vulnerability can be exploited
This issue can be reached with local access to the system, attack complexity is high, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.
CVSS metrics in full
The score comes from this vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Attack vector: Local — a local account, shell or session on the host is needed.
- Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
- Privileges required: Low — an ordinary user account is enough.
- User interaction: None — nobody has to be tricked into anything.
- Scope: Unchanged — the damage stays inside the vulnerable component.
- Confidentiality impact: High — total loss, or loss the attacker controls.
- Integrity impact: High — total loss, or loss the attacker controls.
- Availability impact: High — total loss, or loss the attacker controls.
Affected software
UBUNTU-CVE-2023-4622 is recorded against 106 packages.
- linux (fixed in 5.15.0-87.97)
- linux-allwinner-5.19
- linux-aws (fixed in 5.15.0-1048.53)
- linux-aws-5.0
- linux-aws-5.11
- linux-aws-5.13
- linux-aws-5.15 (fixed in 5.15.0-1048.53~20.04.1)
- linux-aws-5.19
- linux-aws-5.3
- linux-aws-5.4 (fixed in 5.4.0-1112.121~18.04.2)
- linux-aws-5.8
- linux-aws-6.2 (fixed in 6.2.0-1014.14~22.04.1)
- linux-aws-fips
- linux-aws-hwe (fixed in 4.15.0-1162.175~16.04.1)
- linux-azure (fixed in 5.15.0-1050.57)
- linux-azure-4.15 (fixed in 4.15.0-1171.186)
- linux-azure-5.11
- linux-azure-5.13
- linux-azure-5.15 (fixed in 5.15.0-1050.57~20.04.1)
- linux-azure-5.19
- linux-azure-5.3
- linux-azure-5.4 (fixed in 5.4.0-1118.125~18.04.1)
- linux-azure-5.8
- linux-azure-6.2 (fixed in 6.2.0-1015.15~22.04.1)
Show the remaining 82 packages
- linux-azure-edge
- linux-azure-fde (fixed in 5.15.0-1050.57.1)
- linux-azure-fde-5.19
- linux-azure-fde-6.2 (fixed in 6.2.0-1015.15~22.04.1.1)
- linux-azure-fips
- linux-bluefield
- linux-fips
- linux-gcp (fixed in 5.15.0-1045.53)
- linux-gcp-4.15 (fixed in 4.15.0-1156.173)
- linux-gcp-5.11
- linux-gcp-5.13
- linux-gcp-5.15 (fixed in 5.15.0-1045.53~20.04.2)
- linux-gcp-5.19
- linux-gcp-5.3
- linux-gcp-5.4 (fixed in 5.4.0-1116.125~18.04.1)
- linux-gcp-5.8
- linux-gcp-6.2 (fixed in 6.2.0-1017.19~22.04.1)
- linux-gcp-fips
- linux-gke (fixed in 5.15.0-1045.50)
- linux-gke-4.15
- linux-gke-5.15
- linux-gke-5.4
- linux-gkeop (fixed in 5.15.0-1031.37)
- linux-gkeop-5.15 (fixed in 5.15.0-1031.37~20.04.1)
- linux-gkeop-5.4
- linux-hwe
- linux-hwe-5.11
- linux-hwe-5.13
- linux-hwe-5.15 (fixed in 5.15.0-87.97~20.04.1)
- linux-hwe-5.19
- linux-hwe-5.4 (fixed in 5.4.0-165.182~18.04.1)
- linux-hwe-5.8
- linux-hwe-6.2 (fixed in 6.2.0-35.35~22.04.1)
- linux-hwe-edge
- linux-ibm (fixed in 5.15.0-1041.44)
- linux-ibm-5.15 (fixed in 5.15.0-1041.44~20.04.1)
- linux-ibm-5.4 (fixed in 5.4.0-1059.64~18.04.1)
- linux-intel-5.13
- linux-intel-iot-realtime (fixed in 5.15.0-1041.43)
- linux-intel-iotg (fixed in 5.15.0-1043.49)
- linux-intel-iotg-5.15 (fixed in 5.15.0-1043.49~20.04.1)
- linux-iot (fixed in 5.4.0-1024.25)
- linux-kvm (fixed in 5.15.0-1045.50)
- linux-lowlatency (fixed in 5.15.0-87.96)
- linux-lowlatency-hwe-5.15 (fixed in 5.15.0-87.96~20.04.1)
- linux-lowlatency-hwe-5.19
- linux-lowlatency-hwe-6.2 (fixed in 6.2.0-1015.15~22.04.1)
- linux-lts-xenial (fixed in 4.4.0-246.280~14.04.1)
- linux-nvidia (fixed in 5.15.0-1039.39)
- linux-nvidia-6.2 (fixed in 6.2.0-1011.11)
- linux-nvidia-tegra (fixed in 5.15.0-1019.19)
- linux-nvidia-tegra-5.15 (fixed in 5.15.0-1019.19~20.04.1)
- linux-nvidia-tegra-igx (fixed in 5.15.0-1006.6)
- linux-oem
- linux-oem-5.10
- linux-oem-5.13
- linux-oem-5.14
- linux-oem-5.17
- linux-oem-5.6
- linux-oem-6.0
- linux-oem-6.1 (fixed in 6.1.0-1023.23)
- linux-oracle (fixed in 5.15.0-1046.52)
- linux-oracle-5.0
- linux-oracle-5.11
- linux-oracle-5.13
- linux-oracle-5.15 (fixed in 5.15.0-1046.52~20.04.1)
- linux-oracle-5.3
- linux-oracle-5.4 (fixed in 5.4.0-1111.120~18.04.1)
- linux-oracle-5.8
- linux-raspi (fixed in 5.15.0-1041.44)
- linux-raspi-5.4 (fixed in 5.4.0-1096.107~18.04.1)
- linux-raspi-realtime
- linux-raspi2
- linux-realtime (fixed in 5.15.0-1049.55)
- linux-riscv
- linux-riscv-5.11
- linux-riscv-5.15 (fixed in 5.15.0-1044.48~20.04.1)
- linux-riscv-5.19
- linux-riscv-5.8
- linux-starfive-5.19
- linux-starfive-6.2 (fixed in 6.2.0-1007.8~22.04.1)
- linux-xilinx-zynqmp (fixed in 5.15.0-1025.29)
Timeline and source
Published on 6 September 2023 and last revised on 17 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.
References
ubuntu.com (Report)
kernel.dance (Report)
git.kernel.org (Report)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
www.cve.org (Report)
Other advisories for this package
linux has other advisories on record. If you are patching this one, these are worth checking on the same host:
- DEBIAN-CVE-2022-4994 (published 30 Jul 2026)
- CVE-2026-35233 (4.4 Medium, published 1 May 2026)
- CVE-2026-21996 (3.3 Low, published 1 May 2026)
- CVE-2026-21991 (5.5 Medium, published 16 Mar 2026)
- CGA-mcwh-q4vm-9f29 (published 29 Jan 2026)
- CGA-w6xv-3fg4-grm5 (published 29 Jan 2026)
- CGA-7wmc-rrpx-535w (published 7 Jan 2026)
- CGA-5g29-pc3v-86pw (published 7 Jan 2026)
CVE-2023-4622 on other distributions
Each distribution ships its own build and its own fixed version. Pick the one you run:
Details
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| linux | — | 5.15.0-87.97 |
| linux-allwinner-5.19 | — | — |
| linux-aws | — | 5.15.0-1048.53 |
| linux-aws-5.0 | — | — |
| linux-aws-5.11 | — | — |
| linux-aws-5.13 | — | — |
| linux-aws-5.15 | — | 5.15.0-1048.53~20.04.1 |
| linux-aws-5.19 | — | — |
| linux-aws-5.3 | — | — |
| linux-aws-5.4 | — | 5.4.0-1112.121~18.04.2 |
| linux-aws-5.8 | — | — |
| linux-aws-6.2 | — | 6.2.0-1014.14~22.04.1 |
| linux-aws-fips | — | — |
| linux-aws-hwe | — | 4.15.0-1162.175~16.04.1 |
| linux-azure | — | 5.15.0-1050.57 |
| linux-azure-4.15 | — | 4.15.0-1171.186 |
| linux-azure-5.11 | — | — |
| linux-azure-5.13 | — | — |
| linux-azure-5.15 | — | 5.15.0-1050.57~20.04.1 |
| linux-azure-5.19 | — | — |
| linux-azure-5.3 | — | — |
| linux-azure-5.4 | — | 5.4.0-1118.125~18.04.1 |
| linux-azure-5.8 | — | — |
| linux-azure-6.2 | — | 6.2.0-1015.15~22.04.1 |
| linux-azure-edge | — | — |
| linux-azure-fde | — | 5.15.0-1050.57.1 |
| linux-azure-fde-5.19 | — | — |
| linux-azure-fde-6.2 | — | 6.2.0-1015.15~22.04.1.1 |
| linux-azure-fips | — | — |
| linux-bluefield | — | — |
| linux-fips | — | — |
| linux-gcp | — | 5.15.0-1045.53 |
| linux-gcp-4.15 | — | 4.15.0-1156.173 |
| linux-gcp-5.11 | — | — |
| linux-gcp-5.13 | — | — |
| linux-gcp-5.15 | — | 5.15.0-1045.53~20.04.2 |
| linux-gcp-5.19 | — | — |
| linux-gcp-5.3 | — | — |
| linux-gcp-5.4 | — | 5.4.0-1116.125~18.04.1 |
| linux-gcp-5.8 | — | — |
| linux-gcp-6.2 | — | 6.2.0-1017.19~22.04.1 |
| linux-gcp-fips | — | — |
| linux-gke | — | 5.15.0-1045.50 |
| linux-gke-4.15 | — | — |
| linux-gke-5.15 | — | — |
| linux-gke-5.4 | — | — |
| linux-gkeop | — | 5.15.0-1031.37 |
| linux-gkeop-5.15 | — | 5.15.0-1031.37~20.04.1 |
| linux-gkeop-5.4 | — | — |
| linux-hwe | — | — |
| linux-hwe-5.11 | — | — |
| linux-hwe-5.13 | — | — |
| linux-hwe-5.15 | — | 5.15.0-87.97~20.04.1 |
| linux-hwe-5.19 | — | — |
| linux-hwe-5.4 | — | 5.4.0-165.182~18.04.1 |
| linux-hwe-5.8 | — | — |
| linux-hwe-6.2 | — | 6.2.0-35.35~22.04.1 |
| linux-hwe-edge | — | — |
| linux-ibm | — | 5.15.0-1041.44 |
| linux-ibm-5.15 | — | 5.15.0-1041.44~20.04.1 |
| linux-ibm-5.4 | — | 5.4.0-1059.64~18.04.1 |
| linux-intel-5.13 | — | — |
| linux-intel-iot-realtime | — | 5.15.0-1041.43 |
| linux-intel-iotg | — | 5.15.0-1043.49 |
| linux-intel-iotg-5.15 | — | 5.15.0-1043.49~20.04.1 |
| linux-iot | — | 5.4.0-1024.25 |
| linux-kvm | — | 5.15.0-1045.50 |
| linux-lowlatency | — | 5.15.0-87.96 |
| linux-lowlatency-hwe-5.15 | — | 5.15.0-87.96~20.04.1 |
| linux-lowlatency-hwe-5.19 | — | — |
| linux-lowlatency-hwe-6.2 | — | 6.2.0-1015.15~22.04.1 |
| linux-lts-xenial | — | 4.4.0-246.280~14.04.1 |
| linux-nvidia | — | 5.15.0-1039.39 |
| linux-nvidia-6.2 | — | 6.2.0-1011.11 |
| linux-nvidia-tegra | — | 5.15.0-1019.19 |
| linux-nvidia-tegra-5.15 | — | 5.15.0-1019.19~20.04.1 |
| linux-nvidia-tegra-igx | — | 5.15.0-1006.6 |
| linux-oem | — | — |
| linux-oem-5.10 | — | — |
| linux-oem-5.13 | — | — |
| linux-oem-5.14 | — | — |
| linux-oem-5.17 | — | — |
| linux-oem-5.6 | — | — |
| linux-oem-6.0 | — | — |
| linux-oem-6.1 | — | 6.1.0-1023.23 |
| linux-oracle | — | 5.15.0-1046.52 |
| linux-oracle-5.0 | — | — |
| linux-oracle-5.11 | — | — |
| linux-oracle-5.13 | — | — |
| linux-oracle-5.15 | — | 5.15.0-1046.52~20.04.1 |
| linux-oracle-5.3 | — | — |
| linux-oracle-5.4 | — | 5.4.0-1111.120~18.04.1 |
| linux-oracle-5.8 | — | — |
| linux-raspi | — | 5.15.0-1041.44 |
| linux-raspi-5.4 | — | 5.4.0-1096.107~18.04.1 |
| linux-raspi-realtime | — | — |
| linux-raspi2 | — | — |
| linux-realtime | — | 5.15.0-1049.55 |
| linux-riscv | — | — |
| linux-riscv-5.11 | — | — |
| linux-riscv-5.15 | — | 5.15.0-1044.48~20.04.1 |
| linux-riscv-5.19 | — | — |
| linux-riscv-5.8 | — | — |
| linux-starfive-5.19 | — | — |
| linux-starfive-6.2 | — | 6.2.0-1007.8~22.04.1 |
| linux-xilinx-zynqmp | — | 5.15.0-1025.29 |
References
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