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Vulnerability · Published May 21, 2024 · Assigned by Linux

CVE-2023-52837nbd: fix uaf in nbd_open

High 7.8

In plain English

A high-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.2%top 83.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: nbd: fix uaf in nbd_open Commit 4af5f2e03013 ("nbd: use blk_mq_alloc_disk and blk_cleanup_disk") cleans up disk by blk_cleanup_disk() and it won't set disk->private_data as NULL as before. UAF may be triggered in nbd_open() if someone tries to open nbd device right after nbd_put() since nbd has been free in nbd_dev_remove(). Fix this by implementing ->free_disk and free private data in it.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.64-1DEBIAN-CVE-2023-52837
Debian:13linux6.6.8-1DEBIAN-CVE-2023-52837
Debian:14linux6.6.8-1DEBIAN-CVE-2023-52837
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-nvidia-6.56.5.0-1014.14UBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2023-52837
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2023-52837
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2023-52837

Affected products (as reported)

VendorProductVersions
Linux Linux 4af5f2e0301311f88c420fcfc5f3c8611ade20ac – before 4e9b3ec84dc97909876641dad14e0a2300d6c2a34af5f2e0301311f88c420fcfc5f3c8611ade20ac – before 879947f4180bc6e83af64eb0515e0cf57fce15db4af5f2e0301311f88c420fcfc5f3c8611ade20ac – before 56bd7901b5e9dbc9112036ea615ebcba1565fafe4af5f2e0301311f88c420fcfc5f3c8611ade20ac – before 327462725b0f759f093788dfbcb2f1fd132f956b
Linux Linux 5.14

References