🛡️ CVE-2023-52447 on Ubuntu — linux
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Defer the free of inner map when necessary When updating or deleting an inner map in map array or map htab, the map may still be accessed by non-sleepable program or sleepable program. However bpf_map_fd_put_ptr() decreases the ref-counter of the inner map directly through bpf_map_put(), if the ref-counter is the last one (which is true for most cases), the inner map will be freed by ops->map_free() in a kworker. But for now, most .map_free() callbacks don't use synchronize_rcu() or its variants to wait for the elapse of a RCU grace period, so after the invocation of ops->map_free completes, the bpf program which is accessing the inner map may incur use-after-free problem. Fix the free of inner map by invoking bpf_map_free_deferred() after both one RCU grace period and one tasks trace RCU grace period if the inner map has been removed from the outer map before. The deferment is accomplished by using call_rcu() or call_rcu_tasks_trace() when releasing the last ref-counter of bpf map. The newly-added rcu_head field in bpf_map shares the same storage space with work field to reduce the size of bpf_map.
Distribution advisory
This page covers CVE-2023-52447 as tracked by Ubuntu, for the package linux. The fix is available in version 5.15.0-112.122; 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-2023-52447 is recorded against 105 packages.
- linux (fixed in 5.15.0-112.122)
- linux-allwinner-5.19
- linux-aws (fixed in 5.15.0-1063.69)
- linux-aws-5.0
- linux-aws-5.11
- linux-aws-5.13
- linux-aws-5.15 (fixed in 5.15.0-1063.69~20.04.1)
- linux-aws-5.19
- linux-aws-5.3
- linux-aws-5.8
- linux-aws-6.2
- linux-aws-6.5
- linux-aws-fips (fixed in 5.15.0-1063.69+fips1)
- linux-azure (fixed in 5.15.0-1066.75)
- linux-azure-5.11
- linux-azure-5.13
- linux-azure-5.15 (fixed in 5.15.0-1065.74~20.04.1)
- linux-azure-5.19
- linux-azure-5.3
- linux-azure-5.8
- linux-azure-6.2
- linux-azure-6.5 (fixed in 6.5.0-1022.23~22.04.1)
- linux-azure-edge
- linux-azure-fde
Show the remaining 81 packages
- linux-azure-fde-5.19
- linux-azure-fde-6.2
- linux-azure-fde-6.8
- linux-azure-fips (fixed in 5.15.0-1065.74+fips1)
- linux-bluefield
- linux-fips (fixed in 5.15.0-111.121+fips1)
- linux-gcp (fixed in 5.15.0-1062.70)
- linux-gcp-5.11
- linux-gcp-5.13
- linux-gcp-5.15 (fixed in 5.15.0-1062.70~20.04.1)
- linux-gcp-5.19
- linux-gcp-5.3
- 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 5.15.0-1062.70+fips1)
- linux-gke (fixed in 5.15.0-1060.66)
- linux-gke-4.15
- linux-gke-5.15
- linux-gke-5.4
- linux-gkeop (fixed in 5.15.0-1046.53)
- linux-gkeop-5.15 (fixed in 5.15.0-1046.53~20.04.1)
- linux-gkeop-5.4
- linux-hwe
- linux-hwe-5.11
- linux-hwe-5.13
- linux-hwe-5.15 (fixed in 5.15.0-113.123~20.04.1)
- linux-hwe-5.19
- 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 5.15.0-1056.59)
- linux-ibm-5.15 (fixed in 5.15.0-1057.60~20.04.1)
- linux-intel-5.13
- linux-intel-iot-realtime (fixed in 5.15.0-1056.58)
- linux-intel-iotg (fixed in 5.15.0-1058.64)
- linux-intel-iotg-5.15 (fixed in 5.15.0-1058.64~20.04.1)
- linux-kvm (fixed in 5.15.0-1060.65)
- linux-lowlatency (fixed in 5.15.0-110.120)
- linux-lowlatency-hwe-5.15 (fixed in 5.15.0-110.120~20.04.1)
- 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 5.15.0-1058.59)
- 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 (fixed in 6.1.0-1035.35)
- linux-oem-6.5 (fixed in 6.5.0-1024.25)
- linux-oracle (fixed in 5.15.0-1061.67)
- linux-oracle-5.0
- linux-oracle-5.11
- linux-oracle-5.13
- linux-oracle-5.15 (fixed in 5.15.0-1061.67~20.04.1)
- linux-oracle-5.3
- linux-oracle-5.8
- linux-oracle-6.5 (fixed in 6.5.0-1024.24~22.04.1)
- linux-raspi (fixed in 5.15.0-1058.61)
- linux-raspi-realtime (fixed in 6.8.0-2001.1)
- linux-raspi2
- linux-realtime (fixed in 5.15.0-1064.72)
- linux-riscv
- linux-riscv-5.11
- linux-riscv-5.15 (fixed in 5.15.0-1059.63~20.04.1)
- 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 22 February 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)
ubuntu.com (Advisory)
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)
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-8vhr-fq3f-qx7q (published 7 Jan 2026)
- CGA-p49v-mx3v-9ff2 (published 7 Jan 2026)
CVE-2023-52447 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 | — | 5.15.0-112.122 |
| linux-allwinner-5.19 | — | — |
| linux-aws | — | 5.15.0-1063.69 |
| linux-aws-5.0 | — | — |
| linux-aws-5.11 | — | — |
| linux-aws-5.13 | — | — |
| linux-aws-5.15 | — | 5.15.0-1063.69~20.04.1 |
| linux-aws-5.19 | — | — |
| linux-aws-5.3 | — | — |
| linux-aws-5.8 | — | — |
| linux-aws-6.2 | — | — |
| linux-aws-6.5 | — | — |
| linux-aws-fips | — | 5.15.0-1063.69+fips1 |
| linux-azure | — | 5.15.0-1066.75 |
| linux-azure-5.11 | — | — |
| linux-azure-5.13 | — | — |
| linux-azure-5.15 | — | 5.15.0-1065.74~20.04.1 |
| linux-azure-5.19 | — | — |
| linux-azure-5.3 | — | — |
| 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 | — | 5.15.0-1065.74+fips1 |
| linux-bluefield | — | — |
| linux-fips | — | 5.15.0-111.121+fips1 |
| linux-gcp | — | 5.15.0-1062.70 |
| linux-gcp-5.11 | — | — |
| linux-gcp-5.13 | — | — |
| linux-gcp-5.15 | — | 5.15.0-1062.70~20.04.1 |
| linux-gcp-5.19 | — | — |
| linux-gcp-5.3 | — | — |
| linux-gcp-5.8 | — | — |
| linux-gcp-6.2 | — | — |
| linux-gcp-6.5 | — | 6.5.0-1022.24~22.04.1 |
| linux-gcp-fips | — | 5.15.0-1062.70+fips1 |
| linux-gke | — | 5.15.0-1060.66 |
| linux-gke-4.15 | — | — |
| linux-gke-5.15 | — | — |
| linux-gke-5.4 | — | — |
| linux-gkeop | — | 5.15.0-1046.53 |
| linux-gkeop-5.15 | — | 5.15.0-1046.53~20.04.1 |
| linux-gkeop-5.4 | — | — |
| linux-hwe | — | — |
| linux-hwe-5.11 | — | — |
| linux-hwe-5.13 | — | — |
| linux-hwe-5.15 | — | 5.15.0-113.123~20.04.1 |
| linux-hwe-5.19 | — | — |
| 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 | — | 5.15.0-1056.59 |
| linux-ibm-5.15 | — | 5.15.0-1057.60~20.04.1 |
| linux-intel-5.13 | — | — |
| linux-intel-iot-realtime | — | 5.15.0-1056.58 |
| linux-intel-iotg | — | 5.15.0-1058.64 |
| linux-intel-iotg-5.15 | — | 5.15.0-1058.64~20.04.1 |
| linux-kvm | — | 5.15.0-1060.65 |
| linux-lowlatency | — | 5.15.0-110.120 |
| linux-lowlatency-hwe-5.15 | — | 5.15.0-110.120~20.04.1 |
| 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 | — | 5.15.0-1058.59 |
| 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 | — | 6.1.0-1035.35 |
| linux-oem-6.5 | — | 6.5.0-1024.25 |
| linux-oracle | — | 5.15.0-1061.67 |
| linux-oracle-5.0 | — | — |
| linux-oracle-5.11 | — | — |
| linux-oracle-5.13 | — | — |
| linux-oracle-5.15 | — | 5.15.0-1061.67~20.04.1 |
| linux-oracle-5.3 | — | — |
| linux-oracle-5.8 | — | — |
| linux-oracle-6.5 | — | 6.5.0-1024.24~22.04.1 |
| linux-raspi | — | 5.15.0-1058.61 |
| linux-raspi-realtime | — | 6.8.0-2001.1 |
| linux-raspi2 | — | — |
| linux-realtime | — | 5.15.0-1064.72 |
| linux-riscv | — | — |
| linux-riscv-5.11 | — | — |
| linux-riscv-5.15 | — | 5.15.0-1059.63~20.04.1 |
| 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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