🛡️ CVE-2023-6817 on Ubuntu — linux
Description
A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. The function nft_pipapo_walk did not skip inactive elements during set walk which could lead double deactivations of PIPAPO (Pile Packet Policies) elements, leading to use-after-free. We recommend upgrading past commit 317eb9685095678f2c9f5a8189de698c5354316a.
Distribution advisory
This page covers CVE-2023-6817 as tracked by Ubuntu, for the package linux. The fix is available in version 5.15.0-92.102; earlier versions remain affected.
How this vulnerability can be exploited
This issue can be reached with local access to the system, 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 high, integrity high, availability high.
CVSS metrics in full
The score comes from this vector: CVSS:3.1/AV:L/AC:L/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: 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: 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.
Weakness class
UBUNTU-CVE-2023-6817 is classified as CWE-416: Use After Free. Memory is used after being released, so its contents may already belong to something else.
Affected software
UBUNTU-CVE-2023-6817 is recorded against 103 packages.
- linux (fixed in 5.15.0-92.102)
- linux-allwinner-5.19
- linux-aws (fixed in 5.15.0-1052.57)
- linux-aws-5.0
- linux-aws-5.11
- linux-aws-5.13
- linux-aws-5.15 (fixed in 5.15.0-1052.57~20.04.1)
- linux-aws-5.19
- linux-aws-5.3
- linux-aws-5.8
- linux-aws-6.2 (fixed in 6.2.0-1018.18~22.04.1)
- linux-aws-6.5 (fixed in 6.5.0-1012.12~22.04.1)
- linux-aws-fips
- linux-azure (fixed in 5.15.0-1054.62)
- linux-azure-5.11
- linux-azure-5.13
- linux-azure-5.15 (fixed in 5.15.0-1054.62~20.04.1)
- linux-azure-5.19
- linux-azure-5.3
- linux-azure-5.8
- linux-azure-6.2 (fixed in 6.2.0-1019.19~22.04.1)
- linux-azure-6.5 (fixed in 6.5.0-1011.11~22.04.1)
- linux-azure-edge
- linux-azure-fde
Show the remaining 79 packages
- linux-azure-fde-5.19
- linux-azure-fde-6.2 (fixed in 6.2.0-1019.19~22.04.1.1)
- linux-azure-fde-6.8
- linux-azure-fips
- linux-bluefield
- linux-fips
- linux-gcp (fixed in 5.15.0-1049.57)
- linux-gcp-5.11
- linux-gcp-5.13
- linux-gcp-5.15 (fixed in 5.15.0-1049.57~20.04.1)
- linux-gcp-5.19
- linux-gcp-5.3
- linux-gcp-5.8
- linux-gcp-6.2 (fixed in 6.2.0-1021.23~22.04.1)
- linux-gcp-6.5 (fixed in 6.5.0-1011.11~22.04.1)
- linux-gcp-fips (fixed in 5.15.0-1055.63+fips2)
- linux-gke (fixed in 5.15.0-1049.54)
- linux-gke-4.15
- linux-gke-5.15
- linux-gke-5.4
- linux-gkeop (fixed in 5.15.0-1035.41)
- linux-gkeop-5.15 (fixed in 5.15.0-1035.41~20.04.1)
- linux-gkeop-5.4
- linux-hwe
- linux-hwe-5.11
- linux-hwe-5.13
- linux-hwe-5.15 (fixed in 5.15.0-92.102~20.04.1)
- linux-hwe-5.19
- linux-hwe-5.8
- linux-hwe-6.2
- linux-hwe-6.5 (fixed in 6.5.0-15.15~22.04.1)
- linux-hwe-edge
- linux-ibm (fixed in 5.15.0-1045.48)
- linux-ibm-5.15 (fixed in 5.15.0-1045.48~20.04.1)
- linux-intel-5.13
- linux-intel-iot-realtime (fixed in 5.15.0-1046.48)
- linux-intel-iotg (fixed in 5.15.0-1047.53)
- linux-intel-iotg-5.15 (fixed in 5.15.0-1048.54~20.04.1)
- linux-kvm (fixed in 5.15.0-1049.54)
- linux-lowlatency (fixed in 5.15.0-92.102)
- linux-lowlatency-hwe-5.15 (fixed in 5.15.0-92.102~20.04.1)
- linux-lowlatency-hwe-5.19
- linux-lowlatency-hwe-6.2
- linux-lowlatency-hwe-6.5 (fixed in 6.5.0-15.15.1.1~22.04.1)
- linux-nvidia (fixed in 5.15.0-1043.43)
- linux-nvidia-6.2 (fixed in 6.2.0-1015.15)
- linux-nvidia-6.5 (fixed in 6.5.0-1014.14)
- linux-nvidia-tegra (fixed in 5.15.0-1021.21)
- linux-nvidia-tegra-5.15 (fixed in 5.15.0-1022.22~20.04.1)
- linux-nvidia-tegra-igx (fixed in 5.15.0-1008.8)
- 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 6.1.0-1029.29)
- linux-oem-6.5 (fixed in 6.5.0-1013.14)
- linux-oracle (fixed in 5.15.0-1050.56)
- linux-oracle-5.0
- linux-oracle-5.11
- linux-oracle-5.13
- linux-oracle-5.15 (fixed in 5.15.0-1050.56~20.04.1)
- linux-oracle-5.3
- linux-oracle-5.8
- linux-oracle-6.5 (fixed in 6.5.0-1014.14~22.04.1)
- linux-raspi (fixed in 6.7.0-1001.1)
- linux-raspi-realtime
- linux-raspi2
- linux-realtime (fixed in 5.15.0-1053.59)
- linux-riscv
- linux-riscv-5.11
- linux-riscv-5.15 (fixed in 5.15.0-1048.52~20.04.1)
- linux-riscv-5.19
- linux-riscv-5.8
- linux-starfive-5.19
- linux-starfive-6.2
- linux-xilinx-zynqmp (fixed in 5.15.0-1027.31)
Timeline and source
Published on 18 December 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)
git.kernel.org (Report)
kernel.dance (Report)
www.openwall.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)
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-2026-21996 (3.3 Low, published 1 May 2026)
- CVE-2026-35233 (4.4 Medium, 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-6749-c84f-cv6j (published 7 Jan 2026)
- CGA-gqvj-m2xp-q99r (published 7 Jan 2026)
Same weakness in other software
These advisories are the same class of weakness (CWE-416: Use After Free) in other software:
- CVE-2022-21540 (5.3 Medium, published 8 May 2026)
- CVE-2022-50552 (7.8 High, published 7 Oct 2025)
- CVE-2022-50542 (7.8 High, published 7 Oct 2025)
- CVE-2022-50492 (7.8 High, published 4 Oct 2025)
- CVE-2022-50488 (7.8 High, published 4 Oct 2025)
- CVE-2022-50507 (7.8 High, published 4 Oct 2025)
- CVE-2022-50496 (7.8 High, published 4 Oct 2025)
- CVE-2022-50421 (7.8 High, published 1 Oct 2025)
CVE-2023-6817 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:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| linux | — | 5.15.0-92.102 |
| linux-allwinner-5.19 | — | — |
| linux-aws | — | 5.15.0-1052.57 |
| linux-aws-5.0 | — | — |
| linux-aws-5.11 | — | — |
| linux-aws-5.13 | — | — |
| linux-aws-5.15 | — | 5.15.0-1052.57~20.04.1 |
| linux-aws-5.19 | — | — |
| linux-aws-5.3 | — | — |
| linux-aws-5.8 | — | — |
| linux-aws-6.2 | — | 6.2.0-1018.18~22.04.1 |
| linux-aws-6.5 | — | 6.5.0-1012.12~22.04.1 |
| linux-aws-fips | — | — |
| linux-azure | — | 5.15.0-1054.62 |
| linux-azure-5.11 | — | — |
| linux-azure-5.13 | — | — |
| linux-azure-5.15 | — | 5.15.0-1054.62~20.04.1 |
| linux-azure-5.19 | — | — |
| linux-azure-5.3 | — | — |
| linux-azure-5.8 | — | — |
| linux-azure-6.2 | — | 6.2.0-1019.19~22.04.1 |
| linux-azure-6.5 | — | 6.5.0-1011.11~22.04.1 |
| linux-azure-edge | — | — |
| linux-azure-fde | — | — |
| linux-azure-fde-5.19 | — | — |
| linux-azure-fde-6.2 | — | 6.2.0-1019.19~22.04.1.1 |
| linux-azure-fde-6.8 | — | — |
| linux-azure-fips | — | — |
| linux-bluefield | — | — |
| linux-fips | — | — |
| linux-gcp | — | 5.15.0-1049.57 |
| linux-gcp-5.11 | — | — |
| linux-gcp-5.13 | — | — |
| linux-gcp-5.15 | — | 5.15.0-1049.57~20.04.1 |
| linux-gcp-5.19 | — | — |
| linux-gcp-5.3 | — | — |
| linux-gcp-5.8 | — | — |
| linux-gcp-6.2 | — | 6.2.0-1021.23~22.04.1 |
| linux-gcp-6.5 | — | 6.5.0-1011.11~22.04.1 |
| linux-gcp-fips | — | 5.15.0-1055.63+fips2 |
| linux-gke | — | 5.15.0-1049.54 |
| linux-gke-4.15 | — | — |
| linux-gke-5.15 | — | — |
| linux-gke-5.4 | — | — |
| linux-gkeop | — | 5.15.0-1035.41 |
| linux-gkeop-5.15 | — | 5.15.0-1035.41~20.04.1 |
| linux-gkeop-5.4 | — | — |
| linux-hwe | — | — |
| linux-hwe-5.11 | — | — |
| linux-hwe-5.13 | — | — |
| linux-hwe-5.15 | — | 5.15.0-92.102~20.04.1 |
| linux-hwe-5.19 | — | — |
| linux-hwe-5.8 | — | — |
| linux-hwe-6.2 | — | — |
| linux-hwe-6.5 | — | 6.5.0-15.15~22.04.1 |
| linux-hwe-edge | — | — |
| linux-ibm | — | 5.15.0-1045.48 |
| linux-ibm-5.15 | — | 5.15.0-1045.48~20.04.1 |
| linux-intel-5.13 | — | — |
| linux-intel-iot-realtime | — | 5.15.0-1046.48 |
| linux-intel-iotg | — | 5.15.0-1047.53 |
| linux-intel-iotg-5.15 | — | 5.15.0-1048.54~20.04.1 |
| linux-kvm | — | 5.15.0-1049.54 |
| linux-lowlatency | — | 5.15.0-92.102 |
| linux-lowlatency-hwe-5.15 | — | 5.15.0-92.102~20.04.1 |
| linux-lowlatency-hwe-5.19 | — | — |
| linux-lowlatency-hwe-6.2 | — | — |
| linux-lowlatency-hwe-6.5 | — | 6.5.0-15.15.1.1~22.04.1 |
| linux-nvidia | — | 5.15.0-1043.43 |
| linux-nvidia-6.2 | — | 6.2.0-1015.15 |
| linux-nvidia-6.5 | — | 6.5.0-1014.14 |
| linux-nvidia-tegra | — | 5.15.0-1021.21 |
| linux-nvidia-tegra-5.15 | — | 5.15.0-1022.22~20.04.1 |
| linux-nvidia-tegra-igx | — | 5.15.0-1008.8 |
| 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 | — | 6.1.0-1029.29 |
| linux-oem-6.5 | — | 6.5.0-1013.14 |
| linux-oracle | — | 5.15.0-1050.56 |
| linux-oracle-5.0 | — | — |
| linux-oracle-5.11 | — | — |
| linux-oracle-5.13 | — | — |
| linux-oracle-5.15 | — | 5.15.0-1050.56~20.04.1 |
| linux-oracle-5.3 | — | — |
| linux-oracle-5.8 | — | — |
| linux-oracle-6.5 | — | 6.5.0-1014.14~22.04.1 |
| linux-raspi | — | 6.7.0-1001.1 |
| linux-raspi-realtime | — | — |
| linux-raspi2 | — | — |
| linux-realtime | — | 5.15.0-1053.59 |
| linux-riscv | — | — |
| linux-riscv-5.11 | — | — |
| linux-riscv-5.15 | — | 5.15.0-1048.52~20.04.1 |
| linux-riscv-5.19 | — | — |
| linux-riscv-5.8 | — | — |
| linux-starfive-5.19 | — | — |
| linux-starfive-6.2 | — | — |
| linux-xilinx-zynqmp | — | 5.15.0-1027.31 |
References
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