🛡️ CVE-2023-6121 on Ubuntu — linux
Description
An out-of-bounds read vulnerability was found in the NVMe-oF/TCP subsystem in the Linux kernel. This issue may allow a remote attacker to send a crafted TCP packet, triggering a heap-based buffer overflow that results in kmalloc data being printed and potentially leaked to the kernel ring buffer (dmesg).
Distribution advisory
This page covers CVE-2023-6121 as tracked by Ubuntu, for the package linux. The fix is available in version 5.15.0-100.110; earlier versions remain affected.
How this vulnerability can be exploited
This issue can be reached over the network, attack complexity is low, 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 low, integrity none, availability none.
CVSS metrics in full
The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- Attack vector: Network — reachable from anywhere that can route to the service.
- Attack complexity: Low — the attack works reliably, with no preparation.
- 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: Low — limited, and the attacker does not choose what is affected.
- Integrity impact: None.
- Availability impact: None.
Weakness class
UBUNTU-CVE-2023-6121 is classified as CWE-125: Out-of-bounds Read. The code reads past the limits of a buffer, exposing adjacent memory contents or crashing the process.
Affected software
UBUNTU-CVE-2023-6121 is recorded against 116 packages.
- linux (fixed in 5.15.0-100.110)
- linux-allwinner-5.19
- linux-aws (fixed in 5.15.0-1056.61)
- linux-aws-5.0
- linux-aws-5.11
- linux-aws-5.13
- linux-aws-5.15 (fixed in 5.15.0-1056.61~20.04.1)
- linux-aws-5.19
- linux-aws-5.3
- linux-aws-5.4 (fixed in 5.4.0-1120.130~18.04.1)
- linux-aws-5.8
- linux-aws-6.2
- linux-aws-6.5 (fixed in 6.5.0-1015.15~22.04.1)
- linux-aws-fips (fixed in 5.15.0-1056.61+fips1)
- linux-aws-hwe (fixed in 4.15.0-1166.179~16.04.1)
- linux-azure (fixed in 5.15.0-1058.66)
- linux-azure-4.15 (fixed in 4.15.0-1175.190)
- linux-azure-5.11
- linux-azure-5.13
- linux-azure-5.15 (fixed in 5.15.0-1058.66~20.04.2)
- linux-azure-5.19
- linux-azure-5.3
- linux-azure-5.4 (fixed in 5.4.0-1126.133~18.04.1)
- linux-azure-5.8
Show the remaining 92 packages
- linux-azure-6.2
- linux-azure-6.5 (fixed in 6.5.0-1016.16~22.04.1)
- linux-azure-edge
- linux-azure-fde
- linux-azure-fde-5.19
- linux-azure-fde-6.2
- linux-azure-fde-6.8
- linux-azure-fips
- linux-bluefield
- linux-fips (fixed in 5.15.0-100.110+fips1)
- linux-gcp (fixed in 5.15.0-1053.61)
- linux-gcp-4.15 (fixed in 4.15.0-1160.177)
- linux-gcp-5.11
- linux-gcp-5.13
- linux-gcp-5.15 (fixed in 5.15.0-1053.61~20.04.1)
- linux-gcp-5.19
- linux-gcp-5.3
- linux-gcp-5.4 (fixed in 5.4.0-1124.133~18.04.1)
- linux-gcp-5.8
- linux-gcp-6.2
- linux-gcp-6.5 (fixed in 6.5.0-1015.15~22.04.1)
- linux-gcp-fips (fixed in 5.15.0-1055.63+fips2)
- linux-gke (fixed in 5.15.0-1052.57)
- linux-gke-4.15
- linux-gke-5.15
- linux-gke-5.4
- linux-gkeop (fixed in 5.15.0-1038.44)
- linux-gkeop-5.15 (fixed in 5.15.0-1038.44~20.04.1)
- linux-gkeop-5.4
- linux-hwe
- linux-hwe-5.11
- linux-hwe-5.13
- linux-hwe-5.15 (fixed in 5.15.0-100.110~20.04.1)
- linux-hwe-5.19
- linux-hwe-5.4 (fixed in 5.4.0-173.191~18.04.1)
- linux-hwe-5.8
- linux-hwe-6.2
- linux-hwe-6.5 (fixed in 6.5.0-25.25~22.04.1)
- linux-hwe-edge
- linux-ibm (fixed in 5.15.0-1048.51)
- linux-ibm-5.15 (fixed in 5.15.0-1048.51~20.04.1)
- linux-ibm-5.4 (fixed in 5.4.0-1067.72~18.04.1)
- linux-intel-5.13
- linux-intel-iot-realtime (fixed in 5.15.0-1048.50)
- linux-intel-iotg (fixed in 5.15.0-1050.56)
- linux-intel-iotg-5.15 (fixed in 5.15.0-1050.56~20.04.1)
- linux-iot (fixed in 5.4.0-1032.33)
- linux-kvm (fixed in 5.15.0-1052.57)
- linux-lowlatency (fixed in 5.15.0-100.110)
- linux-lowlatency-hwe-5.15 (fixed in 5.15.0-100.110~20.04.1)
- linux-lowlatency-hwe-5.19
- linux-lowlatency-hwe-6.2
- linux-lowlatency-hwe-6.5 (fixed in 6.5.0-25.25.1~22.04.1)
- linux-nvidia (fixed in 5.15.0-1046.46)
- linux-nvidia-6.2
- linux-nvidia-6.5 (fixed in 6.5.0-1014.14)
- linux-nvidia-tegra (fixed in 5.15.0-1025.25)
- linux-nvidia-tegra-5.15 (fixed in 5.15.0-1025.25~20.04.1)
- linux-nvidia-tegra-igx (fixed in 5.15.0-1012.12)
- 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 6.1.0-1033.33)
- linux-oem-6.5 (fixed in 6.5.0-1016.17)
- linux-oracle (fixed in 5.15.0-1053.59)
- linux-oracle-5.0
- linux-oracle-5.11
- linux-oracle-5.13
- linux-oracle-5.15 (fixed in 5.15.0-1053.59~20.04.1)
- linux-oracle-5.3
- linux-oracle-5.4 (fixed in 5.4.0-1119.128~18.04.1)
- linux-oracle-5.8
- linux-oracle-6.5
- linux-raspi (fixed in 6.7.0-1001.1)
- linux-raspi-5.4 (fixed in 5.4.0-1104.116~18.04.1)
- linux-raspi-realtime
- linux-raspi2
- linux-realtime (fixed in 5.15.0-1056.63)
- linux-riscv
- linux-riscv-5.11
- linux-riscv-5.15 (fixed in 5.15.0-1051.55~20.04.1)
- linux-riscv-5.19
- linux-riscv-5.8
- linux-riscv-6.5 (fixed in 6.5.0-25.25.1~22.04.1)
- linux-starfive-5.19
- linux-starfive-6.2
- linux-starfive-6.5 (fixed in 6.5.0-1009.10~22.04.1)
- linux-xilinx-zynqmp (fixed in 5.15.0-1030.34)
Timeline and source
Published on 16 November 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)
lore.kernel.org (Report)
lore.kernel.org (Report)
access.redhat.com (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)
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-53xq-6pp4-5v7f (published 7 Jan 2026)
- CGA-g2p8-xhwc-x7hp (published 7 Jan 2026)
Same weakness in other software
These advisories are the same class of weakness (CWE-125: Out-of-bounds Read) in other software:
- CVE-2019-14492 (8.0 High, published 9 Jul 2026)
- CVE-2022-23594 (8.0 High, published 9 Jul 2026)
- CVE-2017-18009 (8.0 High, published 9 Jul 2026)
- CVE-2019-14491 (8.0 High, published 9 Jul 2026)
- CVE-2022-21728 (8.0 High, published 9 Jul 2026)
- CVE-2017-12599 (8.0 High, published 9 Jul 2026)
- CVE-2017-12598 (8.0 High, published 9 Jul 2026)
- CVE-2019-16249 (published 9 Jul 2026)
CVE-2023-6121 on other distributions
Each distribution ships its own build and its own fixed version. Pick the one you run:
Details
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| linux | — | 5.15.0-100.110 |
| linux-allwinner-5.19 | — | — |
| linux-aws | — | 5.15.0-1056.61 |
| linux-aws-5.0 | — | — |
| linux-aws-5.11 | — | — |
| linux-aws-5.13 | — | — |
| linux-aws-5.15 | — | 5.15.0-1056.61~20.04.1 |
| linux-aws-5.19 | — | — |
| linux-aws-5.3 | — | — |
| linux-aws-5.4 | — | 5.4.0-1120.130~18.04.1 |
| linux-aws-5.8 | — | — |
| linux-aws-6.2 | — | — |
| linux-aws-6.5 | — | 6.5.0-1015.15~22.04.1 |
| linux-aws-fips | — | 5.15.0-1056.61+fips1 |
| linux-aws-hwe | — | 4.15.0-1166.179~16.04.1 |
| linux-azure | — | 5.15.0-1058.66 |
| linux-azure-4.15 | — | 4.15.0-1175.190 |
| linux-azure-5.11 | — | — |
| linux-azure-5.13 | — | — |
| linux-azure-5.15 | — | 5.15.0-1058.66~20.04.2 |
| linux-azure-5.19 | — | — |
| linux-azure-5.3 | — | — |
| linux-azure-5.4 | — | 5.4.0-1126.133~18.04.1 |
| linux-azure-5.8 | — | — |
| linux-azure-6.2 | — | — |
| linux-azure-6.5 | — | 6.5.0-1016.16~22.04.1 |
| linux-azure-edge | — | — |
| linux-azure-fde | — | — |
| linux-azure-fde-5.19 | — | — |
| linux-azure-fde-6.2 | — | — |
| linux-azure-fde-6.8 | — | — |
| linux-azure-fips | — | — |
| linux-bluefield | — | — |
| linux-fips | — | 5.15.0-100.110+fips1 |
| linux-gcp | — | 5.15.0-1053.61 |
| linux-gcp-4.15 | — | 4.15.0-1160.177 |
| linux-gcp-5.11 | — | — |
| linux-gcp-5.13 | — | — |
| linux-gcp-5.15 | — | 5.15.0-1053.61~20.04.1 |
| linux-gcp-5.19 | — | — |
| linux-gcp-5.3 | — | — |
| linux-gcp-5.4 | — | 5.4.0-1124.133~18.04.1 |
| linux-gcp-5.8 | — | — |
| linux-gcp-6.2 | — | — |
| linux-gcp-6.5 | — | 6.5.0-1015.15~22.04.1 |
| linux-gcp-fips | — | 5.15.0-1055.63+fips2 |
| linux-gke | — | 5.15.0-1052.57 |
| linux-gke-4.15 | — | — |
| linux-gke-5.15 | — | — |
| linux-gke-5.4 | — | — |
| linux-gkeop | — | 5.15.0-1038.44 |
| linux-gkeop-5.15 | — | 5.15.0-1038.44~20.04.1 |
| linux-gkeop-5.4 | — | — |
| linux-hwe | — | — |
| linux-hwe-5.11 | — | — |
| linux-hwe-5.13 | — | — |
| linux-hwe-5.15 | — | 5.15.0-100.110~20.04.1 |
| linux-hwe-5.19 | — | — |
| linux-hwe-5.4 | — | 5.4.0-173.191~18.04.1 |
| linux-hwe-5.8 | — | — |
| linux-hwe-6.2 | — | — |
| linux-hwe-6.5 | — | 6.5.0-25.25~22.04.1 |
| linux-hwe-edge | — | — |
| linux-ibm | — | 5.15.0-1048.51 |
| linux-ibm-5.15 | — | 5.15.0-1048.51~20.04.1 |
| linux-ibm-5.4 | — | 5.4.0-1067.72~18.04.1 |
| linux-intel-5.13 | — | — |
| linux-intel-iot-realtime | — | 5.15.0-1048.50 |
| linux-intel-iotg | — | 5.15.0-1050.56 |
| linux-intel-iotg-5.15 | — | 5.15.0-1050.56~20.04.1 |
| linux-iot | — | 5.4.0-1032.33 |
| linux-kvm | — | 5.15.0-1052.57 |
| linux-lowlatency | — | 5.15.0-100.110 |
| linux-lowlatency-hwe-5.15 | — | 5.15.0-100.110~20.04.1 |
| linux-lowlatency-hwe-5.19 | — | — |
| linux-lowlatency-hwe-6.2 | — | — |
| linux-lowlatency-hwe-6.5 | — | 6.5.0-25.25.1~22.04.1 |
| linux-nvidia | — | 5.15.0-1046.46 |
| linux-nvidia-6.2 | — | — |
| linux-nvidia-6.5 | — | 6.5.0-1014.14 |
| linux-nvidia-tegra | — | 5.15.0-1025.25 |
| linux-nvidia-tegra-5.15 | — | 5.15.0-1025.25~20.04.1 |
| linux-nvidia-tegra-igx | — | 5.15.0-1012.12 |
| 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 | — | 6.1.0-1033.33 |
| linux-oem-6.5 | — | 6.5.0-1016.17 |
| linux-oracle | — | 5.15.0-1053.59 |
| linux-oracle-5.0 | — | — |
| linux-oracle-5.11 | — | — |
| linux-oracle-5.13 | — | — |
| linux-oracle-5.15 | — | 5.15.0-1053.59~20.04.1 |
| linux-oracle-5.3 | — | — |
| linux-oracle-5.4 | — | 5.4.0-1119.128~18.04.1 |
| linux-oracle-5.8 | — | — |
| linux-oracle-6.5 | — | — |
| linux-raspi | — | 6.7.0-1001.1 |
| linux-raspi-5.4 | — | 5.4.0-1104.116~18.04.1 |
| linux-raspi-realtime | — | — |
| linux-raspi2 | — | — |
| linux-realtime | — | 5.15.0-1056.63 |
| linux-riscv | — | — |
| linux-riscv-5.11 | — | — |
| linux-riscv-5.15 | — | 5.15.0-1051.55~20.04.1 |
| linux-riscv-5.19 | — | — |
| linux-riscv-5.8 | — | — |
| linux-riscv-6.5 | — | 6.5.0-25.25.1~22.04.1 |
| linux-starfive-5.19 | — | — |
| linux-starfive-6.2 | — | — |
| linux-starfive-6.5 | — | 6.5.0-1009.10~22.04.1 |
| linux-xilinx-zynqmp | — | 5.15.0-1030.34 |
References
Similar Threats
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