🛡️ CVE-2023-52927 on Ubuntu — linux
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: allow exp not to be removed in nf_ct_find_expectation Currently nf_conntrack_in() calling nf_ct_find_expectation() will remove the exp from the hash table. However, in some scenario, we expect the exp not to be removed when the created ct will not be confirmed, like in OVS and TC conntrack in the following patches. This patch allows exp not to be removed by setting IPS_CONFIRMED in the status of the tmpl.
Distribution advisory
This page covers CVE-2023-52927 as tracked by Ubuntu, for the package linux. The fix is available in version 5.15.0-139.149; 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-2023-52927 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-2023-52927 is recorded against 118 packages.
- linux (fixed in 5.15.0-139.149)
- linux-allwinner-5.19
- linux-aws (fixed in 5.15.0-1083.90)
- linux-aws-5.0
- linux-aws-5.11
- linux-aws-5.13
- linux-aws-5.15 (fixed in 5.15.0-1083.90~20.04.1)
- linux-aws-5.19
- linux-aws-5.3
- linux-aws-5.4 (fixed in 5.4.0-1145.155~18.04.1)
- linux-aws-5.8
- linux-aws-6.2
- linux-aws-6.5
- linux-aws-fips (fixed in 5.15.0-1083.90+fips1)
- linux-aws-hwe (fixed in 4.15.0-1180.193~16.04.1)
- linux-azure (fixed in 5.15.0-1088.97)
- linux-azure-4.15 (fixed in 4.15.0-1188.203)
- linux-azure-5.11
- linux-azure-5.13
- linux-azure-5.15 (fixed in 5.15.0-1088.97~20.04.1)
- linux-azure-5.19
- linux-azure-5.3
- linux-azure-5.4 (fixed in 5.4.0-1150.157~18.04.1)
- linux-azure-5.8
Show the remaining 94 packages
- linux-azure-6.2
- linux-azure-6.5
- linux-azure-edge
- linux-azure-fde
- linux-azure-fde-5.15 (fixed in 5.15.0-1114.123~20.04.1)
- linux-azure-fde-5.19
- linux-azure-fde-6.2
- linux-azure-fde-6.8
- linux-azure-fips (fixed in 5.15.0-1088.97+fips1)
- linux-bluefield
- linux-fips (fixed in 5.15.0-139.149+fips1)
- linux-gcp (fixed in 5.15.0-1082.91)
- linux-gcp-4.15 (fixed in 4.15.0-1173.190)
- linux-gcp-5.11
- linux-gcp-5.13
- linux-gcp-5.15 (fixed in 5.15.0-1083.92~20.04.1)
- linux-gcp-5.19
- linux-gcp-5.3
- linux-gcp-5.4 (fixed in 5.4.0-1148.157~18.04.1)
- linux-gcp-5.8
- linux-gcp-6.2
- linux-gcp-6.5
- linux-gcp-fips (fixed in 5.15.0-1082.91+fips1)
- linux-gke (fixed in 5.15.0-1080.86)
- linux-gke-4.15
- linux-gke-5.15
- linux-gke-5.4
- linux-gkeop (fixed in 5.15.0-1065.73)
- linux-gkeop-5.15
- linux-gkeop-5.4
- linux-hwe
- linux-hwe-5.11
- linux-hwe-5.13
- linux-hwe-5.15 (fixed in 5.15.0-139.149~20.04.1)
- linux-hwe-5.19
- linux-hwe-5.4 (fixed in 5.4.0-215.235~18.04.1)
- linux-hwe-5.8
- linux-hwe-6.2
- linux-hwe-6.5
- linux-hwe-edge
- linux-ibm (fixed in 5.15.0-1075.78)
- linux-ibm-5.15 (fixed in 5.15.0-1075.78~20.04.1)
- linux-ibm-5.4 (fixed in 5.4.0-1092.97~18.04.1)
- linux-intel-5.13
- linux-intel-iot-realtime (fixed in 5.15.0-1076.78)
- linux-intel-iotg (fixed in 5.15.0-1078.84)
- linux-intel-iotg-5.15 (fixed in 5.15.0-1078.84~20.04.1)
- linux-iot (fixed in 5.4.0-1051.54)
- linux-kvm (fixed in 5.15.0-1079.84)
- linux-lowlatency (fixed in 5.15.0-139.149)
- linux-lowlatency-hwe-5.15 (fixed in 5.15.0-139.149~20.04.1)
- linux-lowlatency-hwe-5.19
- linux-lowlatency-hwe-6.2
- linux-lowlatency-hwe-6.5
- linux-lts-xenial
- linux-nvidia (fixed in 5.15.0-1077.78)
- linux-nvidia-6.2
- linux-nvidia-6.5
- linux-nvidia-tegra (fixed in 5.15.0-1036.36)
- linux-nvidia-tegra-5.15 (fixed in 5.15.0-1039.39~20.04.1)
- linux-nvidia-tegra-igx (fixed in 5.15.0-1024.24)
- 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
- linux-oem-6.5
- linux-oracle (fixed in 5.15.0-1080.86)
- linux-oracle-5.0
- linux-oracle-5.11
- linux-oracle-5.13
- linux-oracle-5.15 (fixed in 5.15.0-1080.86~20.04.1)
- linux-oracle-5.3
- linux-oracle-5.4 (fixed in 5.4.0-1143.153~18.04.1)
- linux-oracle-5.8
- linux-oracle-6.5
- linux-raspi (fixed in 5.15.0-1077.80)
- linux-raspi-5.4 (fixed in 5.4.0-1129.142~18.04.1)
- linux-raspi-realtime
- linux-raspi2
- linux-realtime
- linux-riscv
- linux-riscv-5.11
- linux-riscv-5.15 (fixed in 5.15.0-1078.82~20.04.1)
- linux-riscv-5.19
- linux-riscv-5.8
- linux-riscv-6.5
- linux-starfive-5.19
- linux-starfive-6.2
- linux-starfive-6.5
- linux-xilinx-zynqmp (fixed in 5.15.0-1050.54)
Timeline and source
Published on 14 March 2025 and last revised on 19 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.
References
ubuntu.com (Report)
www.cve.org (Report)
git.kernel.org (Report)
git.kernel.org (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)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
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-q945-42pm-prx5 (published 7 Jan 2026)
- CGA-3m96-cwq8-6xmx (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-2022-50488 (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-2022-50492 (7.8 High, published 4 Oct 2025)
- CVE-2022-50454 (7.8 High, published 1 Oct 2025)
CVE-2023-52927 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 | — | 5.15.0-139.149 |
| linux-allwinner-5.19 | — | — |
| linux-aws | — | 5.15.0-1083.90 |
| linux-aws-5.0 | — | — |
| linux-aws-5.11 | — | — |
| linux-aws-5.13 | — | — |
| linux-aws-5.15 | — | 5.15.0-1083.90~20.04.1 |
| linux-aws-5.19 | — | — |
| linux-aws-5.3 | — | — |
| linux-aws-5.4 | — | 5.4.0-1145.155~18.04.1 |
| linux-aws-5.8 | — | — |
| linux-aws-6.2 | — | — |
| linux-aws-6.5 | — | — |
| linux-aws-fips | — | 5.15.0-1083.90+fips1 |
| linux-aws-hwe | — | 4.15.0-1180.193~16.04.1 |
| linux-azure | — | 5.15.0-1088.97 |
| linux-azure-4.15 | — | 4.15.0-1188.203 |
| linux-azure-5.11 | — | — |
| linux-azure-5.13 | — | — |
| linux-azure-5.15 | — | 5.15.0-1088.97~20.04.1 |
| linux-azure-5.19 | — | — |
| linux-azure-5.3 | — | — |
| linux-azure-5.4 | — | 5.4.0-1150.157~18.04.1 |
| linux-azure-5.8 | — | — |
| linux-azure-6.2 | — | — |
| linux-azure-6.5 | — | — |
| linux-azure-edge | — | — |
| linux-azure-fde | — | — |
| linux-azure-fde-5.15 | — | 5.15.0-1114.123~20.04.1 |
| linux-azure-fde-5.19 | — | — |
| linux-azure-fde-6.2 | — | — |
| linux-azure-fde-6.8 | — | — |
| linux-azure-fips | — | 5.15.0-1088.97+fips1 |
| linux-bluefield | — | — |
| linux-fips | — | 5.15.0-139.149+fips1 |
| linux-gcp | — | 5.15.0-1082.91 |
| linux-gcp-4.15 | — | 4.15.0-1173.190 |
| linux-gcp-5.11 | — | — |
| linux-gcp-5.13 | — | — |
| linux-gcp-5.15 | — | 5.15.0-1083.92~20.04.1 |
| linux-gcp-5.19 | — | — |
| linux-gcp-5.3 | — | — |
| linux-gcp-5.4 | — | 5.4.0-1148.157~18.04.1 |
| linux-gcp-5.8 | — | — |
| linux-gcp-6.2 | — | — |
| linux-gcp-6.5 | — | — |
| linux-gcp-fips | — | 5.15.0-1082.91+fips1 |
| linux-gke | — | 5.15.0-1080.86 |
| linux-gke-4.15 | — | — |
| linux-gke-5.15 | — | — |
| linux-gke-5.4 | — | — |
| linux-gkeop | — | 5.15.0-1065.73 |
| linux-gkeop-5.15 | — | — |
| linux-gkeop-5.4 | — | — |
| linux-hwe | — | — |
| linux-hwe-5.11 | — | — |
| linux-hwe-5.13 | — | — |
| linux-hwe-5.15 | — | 5.15.0-139.149~20.04.1 |
| linux-hwe-5.19 | — | — |
| linux-hwe-5.4 | — | 5.4.0-215.235~18.04.1 |
| linux-hwe-5.8 | — | — |
| linux-hwe-6.2 | — | — |
| linux-hwe-6.5 | — | — |
| linux-hwe-edge | — | — |
| linux-ibm | — | 5.15.0-1075.78 |
| linux-ibm-5.15 | — | 5.15.0-1075.78~20.04.1 |
| linux-ibm-5.4 | — | 5.4.0-1092.97~18.04.1 |
| linux-intel-5.13 | — | — |
| linux-intel-iot-realtime | — | 5.15.0-1076.78 |
| linux-intel-iotg | — | 5.15.0-1078.84 |
| linux-intel-iotg-5.15 | — | 5.15.0-1078.84~20.04.1 |
| linux-iot | — | 5.4.0-1051.54 |
| linux-kvm | — | 5.15.0-1079.84 |
| linux-lowlatency | — | 5.15.0-139.149 |
| linux-lowlatency-hwe-5.15 | — | 5.15.0-139.149~20.04.1 |
| linux-lowlatency-hwe-5.19 | — | — |
| linux-lowlatency-hwe-6.2 | — | — |
| linux-lowlatency-hwe-6.5 | — | — |
| linux-lts-xenial | — | — |
| linux-nvidia | — | 5.15.0-1077.78 |
| linux-nvidia-6.2 | — | — |
| linux-nvidia-6.5 | — | — |
| linux-nvidia-tegra | — | 5.15.0-1036.36 |
| linux-nvidia-tegra-5.15 | — | 5.15.0-1039.39~20.04.1 |
| linux-nvidia-tegra-igx | — | 5.15.0-1024.24 |
| 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 | — | — |
| linux-oem-6.5 | — | — |
| linux-oracle | — | 5.15.0-1080.86 |
| linux-oracle-5.0 | — | — |
| linux-oracle-5.11 | — | — |
| linux-oracle-5.13 | — | — |
| linux-oracle-5.15 | — | 5.15.0-1080.86~20.04.1 |
| linux-oracle-5.3 | — | — |
| linux-oracle-5.4 | — | 5.4.0-1143.153~18.04.1 |
| linux-oracle-5.8 | — | — |
| linux-oracle-6.5 | — | — |
| linux-raspi | — | 5.15.0-1077.80 |
| linux-raspi-5.4 | — | 5.4.0-1129.142~18.04.1 |
| linux-raspi-realtime | — | — |
| linux-raspi2 | — | — |
| linux-realtime | — | — |
| linux-riscv | — | — |
| linux-riscv-5.11 | — | — |
| linux-riscv-5.15 | — | 5.15.0-1078.82~20.04.1 |
| linux-riscv-5.19 | — | — |
| linux-riscv-5.8 | — | — |
| linux-riscv-6.5 | — | — |
| linux-starfive-5.19 | — | — |
| linux-starfive-6.2 | — | — |
| linux-starfive-6.5 | — | — |
| linux-xilinx-zynqmp | — | 5.15.0-1050.54 |
References
Similar Threats
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