🛡️ CVE-2023-52486 on Ubuntu — linux
Description
In the Linux kernel, the following vulnerability has been resolved: drm: Don't unref the same fb many times by mistake due to deadlock handling If we get a deadlock after the fb lookup in drm_mode_page_flip_ioctl() we proceed to unref the fb and then retry the whole thing from the top. But we forget to reset the fb pointer back to NULL, and so if we then get another error during the retry, before the fb lookup, we proceed the unref the same fb again without having gotten another reference. The end result is that the fb will (eventually) end up being freed while it's still in use. Reset fb to NULL once we've unreffed it to avoid doing it again until we've done another fb lookup. This turned out to be pretty easy to hit on a DG2 when doing async flips (and CONFIG_DEBUG_WW_MUTEX_SLOWPATH=y). The first symptom I saw that drm_closefb() simply got stuck in a busy loop while walking the framebuffer list. Fortunately I was able to convince it to oops instead, and from there it was easier to track down the culprit.
Distribution advisory
This page covers CVE-2023-52486 as tracked by Ubuntu, for the package linux. The fix is available in version 5.15.0-106.116; 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.
Affected software
UBUNTU-CVE-2023-52486 is recorded against 116 packages.
- linux (fixed in 5.15.0-106.116)
- linux-allwinner-5.19
- linux-aws (fixed in 5.15.0-1061.67)
- linux-aws-5.0
- linux-aws-5.11
- linux-aws-5.13
- linux-aws-5.15 (fixed in 5.15.0-1061.67~20.04.1)
- linux-aws-5.19
- linux-aws-5.3
- linux-aws-5.4 (fixed in 5.4.0-1124.134~18.04.1)
- linux-aws-5.8
- linux-aws-6.2
- linux-aws-6.5
- linux-aws-fips (fixed in 5.15.0-1061.67+fips1)
- linux-aws-hwe (fixed in 4.15.0-1176.189~16.04.1)
- linux-azure (fixed in 5.15.0-1063.72)
- linux-azure-4.15 (fixed in 4.15.0-1184.199)
- linux-azure-5.11
- linux-azure-5.13
- linux-azure-5.15 (fixed in 5.15.0-1063.72~20.04.1)
- linux-azure-5.19
- linux-azure-5.3
- linux-azure-5.4 (fixed in 5.4.0-1129.136~18.04.1)
- linux-azure-5.8
Show the remaining 92 packages
- linux-azure-6.2
- linux-azure-6.5 (fixed in 6.5.0-1022.23~22.04.1)
- linux-azure-edge
- linux-azure-fde
- linux-azure-fde-5.19
- linux-azure-fde-6.2
- linux-azure-fde-6.8
- linux-azure-fips (fixed in 5.15.0-1063.72+fips1)
- linux-bluefield
- linux-fips (fixed in 5.15.0-106.116+fips1)
- linux-gcp (fixed in 5.15.0-1059.67)
- linux-gcp-4.15 (fixed in 4.15.0-1169.186)
- linux-gcp-5.11
- linux-gcp-5.13
- linux-gcp-5.15 (fixed in 5.15.0-1059.67~20.04.1)
- linux-gcp-5.19
- linux-gcp-5.3
- linux-gcp-5.4 (fixed in 5.4.0-1128.137~18.04.1)
- linux-gcp-5.8
- linux-gcp-6.2
- linux-gcp-6.5 (fixed in 6.5.0-1022.24~22.04.1)
- linux-gcp-fips (fixed in 5.15.0-1059.67+fips1)
- linux-gke (fixed in 5.15.0-1058.63)
- linux-gke-4.15
- linux-gke-5.15
- linux-gke-5.4
- linux-gkeop (fixed in 5.15.0-1044.51)
- linux-gkeop-5.15 (fixed in 5.15.0-1044.51~20.04.1)
- linux-gkeop-5.4
- linux-hwe
- linux-hwe-5.11
- linux-hwe-5.13
- linux-hwe-5.15 (fixed in 5.15.0-106.116~20.04.1)
- linux-hwe-5.19
- linux-hwe-5.4 (fixed in 5.4.0-181.201~18.04.1)
- linux-hwe-5.8
- linux-hwe-6.2
- linux-hwe-6.5 (fixed in 6.5.0-41.41~22.04.2)
- linux-hwe-edge
- linux-ibm (fixed in 5.15.0-1054.57)
- linux-ibm-5.15 (fixed in 5.15.0-1054.57~20.04.1)
- linux-ibm-5.4 (fixed in 5.4.0-1071.76~18.04.1)
- linux-intel-5.13
- linux-intel-iot-realtime (fixed in 5.15.0-1054.56)
- linux-intel-iotg (fixed in 5.15.0-1057.63)
- linux-intel-iotg-5.15 (fixed in 5.15.0-1058.64~20.04.1)
- linux-iot (fixed in 5.4.0-1036.37)
- linux-kvm (fixed in 5.15.0-1058.63)
- linux-lowlatency (fixed in 5.15.0-106.116)
- linux-lowlatency-hwe-5.15 (fixed in 5.15.0-106.116~20.04.1)
- linux-lowlatency-hwe-5.19
- linux-lowlatency-hwe-6.2
- linux-lowlatency-hwe-6.5 (fixed in 6.5.0-41.41.1~22.04.1)
- linux-nvidia (fixed in 5.15.0-1054.55)
- linux-nvidia-6.2
- linux-nvidia-6.5 (fixed in 6.5.0-1021.22)
- linux-nvidia-tegra (fixed in 5.15.0-1026.26)
- linux-nvidia-tegra-5.15 (fixed in 5.15.0-1027.27~20.04.1)
- linux-nvidia-tegra-igx (fixed in 5.15.0-1015.15)
- 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 (fixed in 6.5.0-1024.25)
- linux-oracle (fixed in 5.15.0-1059.65)
- linux-oracle-5.0
- linux-oracle-5.11
- linux-oracle-5.13
- linux-oracle-5.15 (fixed in 5.15.0-1059.65~20.04.1)
- linux-oracle-5.3
- linux-oracle-5.4 (fixed in 5.4.0-1123.132~18.04.1)
- linux-oracle-5.8
- linux-oracle-6.5 (fixed in 6.5.0-1024.24~22.04.1)
- linux-raspi (fixed in 5.15.0-1054.57)
- linux-raspi-5.4 (fixed in 5.4.0-1108.120~18.04.1)
- linux-raspi-realtime (fixed in 6.8.0-2001.1)
- linux-raspi2
- linux-realtime (fixed in 5.15.0-1062.70)
- linux-riscv
- linux-riscv-5.11
- linux-riscv-5.15 (fixed in 5.15.0-1057.61~20.04.1)
- linux-riscv-5.19
- linux-riscv-5.8
- linux-riscv-6.5 (fixed in 6.5.0-40.40.1~22.04.1)
- linux-starfive-5.19
- linux-starfive-6.2
- linux-starfive-6.5 (fixed in 6.5.0-1015.16~22.04.1)
- linux-xilinx-zynqmp (fixed in 5.15.0-1030.34)
Timeline and source
Published on 11 March 2024 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)
git.kernel.org (Report)
git.kernel.org (Report)
git.kernel.org (Report)
git.kernel.org (Report)
git.kernel.org (Report)
git.kernel.org (Report)
git.kernel.org (Report)
git.kernel.org (Report)
www.cve.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)
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-w6xv-3fg4-grm5 (published 29 Jan 2026)
- CGA-mcwh-q4vm-9f29 (published 29 Jan 2026)
- CGA-wf5v-37v7-wvrh (published 7 Jan 2026)
- CGA-58q9-gmq4-72q9 (published 7 Jan 2026)
CVE-2023-52486 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 | — | 5.15.0-106.116 |
| linux-allwinner-5.19 | — | — |
| linux-aws | — | 5.15.0-1061.67 |
| linux-aws-5.0 | — | — |
| linux-aws-5.11 | — | — |
| linux-aws-5.13 | — | — |
| linux-aws-5.15 | — | 5.15.0-1061.67~20.04.1 |
| linux-aws-5.19 | — | — |
| linux-aws-5.3 | — | — |
| linux-aws-5.4 | — | 5.4.0-1124.134~18.04.1 |
| linux-aws-5.8 | — | — |
| linux-aws-6.2 | — | — |
| linux-aws-6.5 | — | — |
| linux-aws-fips | — | 5.15.0-1061.67+fips1 |
| linux-aws-hwe | — | 4.15.0-1176.189~16.04.1 |
| linux-azure | — | 5.15.0-1063.72 |
| linux-azure-4.15 | — | 4.15.0-1184.199 |
| linux-azure-5.11 | — | — |
| linux-azure-5.13 | — | — |
| linux-azure-5.15 | — | 5.15.0-1063.72~20.04.1 |
| linux-azure-5.19 | — | — |
| linux-azure-5.3 | — | — |
| linux-azure-5.4 | — | 5.4.0-1129.136~18.04.1 |
| linux-azure-5.8 | — | — |
| linux-azure-6.2 | — | — |
| linux-azure-6.5 | — | 6.5.0-1022.23~22.04.1 |
| linux-azure-edge | — | — |
| linux-azure-fde | — | — |
| linux-azure-fde-5.19 | — | — |
| linux-azure-fde-6.2 | — | — |
| linux-azure-fde-6.8 | — | — |
| linux-azure-fips | — | 5.15.0-1063.72+fips1 |
| linux-bluefield | — | — |
| linux-fips | — | 5.15.0-106.116+fips1 |
| linux-gcp | — | 5.15.0-1059.67 |
| linux-gcp-4.15 | — | 4.15.0-1169.186 |
| linux-gcp-5.11 | — | — |
| linux-gcp-5.13 | — | — |
| linux-gcp-5.15 | — | 5.15.0-1059.67~20.04.1 |
| linux-gcp-5.19 | — | — |
| linux-gcp-5.3 | — | — |
| linux-gcp-5.4 | — | 5.4.0-1128.137~18.04.1 |
| linux-gcp-5.8 | — | — |
| linux-gcp-6.2 | — | — |
| linux-gcp-6.5 | — | 6.5.0-1022.24~22.04.1 |
| linux-gcp-fips | — | 5.15.0-1059.67+fips1 |
| linux-gke | — | 5.15.0-1058.63 |
| linux-gke-4.15 | — | — |
| linux-gke-5.15 | — | — |
| linux-gke-5.4 | — | — |
| linux-gkeop | — | 5.15.0-1044.51 |
| linux-gkeop-5.15 | — | 5.15.0-1044.51~20.04.1 |
| linux-gkeop-5.4 | — | — |
| linux-hwe | — | — |
| linux-hwe-5.11 | — | — |
| linux-hwe-5.13 | — | — |
| linux-hwe-5.15 | — | 5.15.0-106.116~20.04.1 |
| linux-hwe-5.19 | — | — |
| linux-hwe-5.4 | — | 5.4.0-181.201~18.04.1 |
| linux-hwe-5.8 | — | — |
| linux-hwe-6.2 | — | — |
| linux-hwe-6.5 | — | 6.5.0-41.41~22.04.2 |
| linux-hwe-edge | — | — |
| linux-ibm | — | 5.15.0-1054.57 |
| linux-ibm-5.15 | — | 5.15.0-1054.57~20.04.1 |
| linux-ibm-5.4 | — | 5.4.0-1071.76~18.04.1 |
| linux-intel-5.13 | — | — |
| linux-intel-iot-realtime | — | 5.15.0-1054.56 |
| linux-intel-iotg | — | 5.15.0-1057.63 |
| linux-intel-iotg-5.15 | — | 5.15.0-1058.64~20.04.1 |
| linux-iot | — | 5.4.0-1036.37 |
| linux-kvm | — | 5.15.0-1058.63 |
| linux-lowlatency | — | 5.15.0-106.116 |
| linux-lowlatency-hwe-5.15 | — | 5.15.0-106.116~20.04.1 |
| linux-lowlatency-hwe-5.19 | — | — |
| linux-lowlatency-hwe-6.2 | — | — |
| linux-lowlatency-hwe-6.5 | — | 6.5.0-41.41.1~22.04.1 |
| linux-nvidia | — | 5.15.0-1054.55 |
| linux-nvidia-6.2 | — | — |
| linux-nvidia-6.5 | — | 6.5.0-1021.22 |
| linux-nvidia-tegra | — | 5.15.0-1026.26 |
| linux-nvidia-tegra-5.15 | — | 5.15.0-1027.27~20.04.1 |
| linux-nvidia-tegra-igx | — | 5.15.0-1015.15 |
| 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 | — | 6.5.0-1024.25 |
| linux-oracle | — | 5.15.0-1059.65 |
| linux-oracle-5.0 | — | — |
| linux-oracle-5.11 | — | — |
| linux-oracle-5.13 | — | — |
| linux-oracle-5.15 | — | 5.15.0-1059.65~20.04.1 |
| linux-oracle-5.3 | — | — |
| linux-oracle-5.4 | — | 5.4.0-1123.132~18.04.1 |
| linux-oracle-5.8 | — | — |
| linux-oracle-6.5 | — | 6.5.0-1024.24~22.04.1 |
| linux-raspi | — | 5.15.0-1054.57 |
| linux-raspi-5.4 | — | 5.4.0-1108.120~18.04.1 |
| linux-raspi-realtime | — | 6.8.0-2001.1 |
| linux-raspi2 | — | — |
| linux-realtime | — | 5.15.0-1062.70 |
| linux-riscv | — | — |
| linux-riscv-5.11 | — | — |
| linux-riscv-5.15 | — | 5.15.0-1057.61~20.04.1 |
| linux-riscv-5.19 | — | — |
| linux-riscv-5.8 | — | — |
| linux-riscv-6.5 | — | 6.5.0-40.40.1~22.04.1 |
| linux-starfive-5.19 | — | — |
| linux-starfive-6.2 | — | — |
| linux-starfive-6.5 | — | 6.5.0-1015.16~22.04.1 |
| linux-xilinx-zynqmp | — | 5.15.0-1030.34 |
References
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