CVE-2021-45868 — Use After Free in Kernel

CWE-416 — Use After Free11 documents7 sources
Severity
5.5MEDIUMNVD
OSV5.9
EPSS
0.4%
top 39.39%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Linux KernelDebian LinuxMsrc CM1 Kernel 5.10.109.1-2 ON CBL Mariner 1.0
Timeline
PublishedMar 18
Latest updateApr 12

Description

In the Linux kernel before 5.15.3, fs/quota/quota_tree.c does not validate the block number in the quota tree (on disk). This can, for example, lead to a kernel/locking/rwsem.c use-after-free if there is a corrupted quota file.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HExploitability: 1.8 | Impact: 3.6

Affected Packages5 packages

▶NVDlinux/linux_kernel< 5.15.3
▶Debianlinux/linux_kernel< 5.10.84-1+3
▶Ubuntulinux/linux_kernel< 4.4.0-239.273
▶debiandebian/linux< linux 5.15.3-1 (bookworm)

Patches

Patch: git.kernel.org ↗Patch: www.openwall.com ↗Patch: www.openwall.com ↗

🔴Vulnerability Details

4
OSV
linux, linux-kvm, linux-lts-xenial vulnerabilities↗2023-04-12
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OSV
linux-aws vulnerabilities↗2023-04-06
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GHSA
GHSA-99wm-68jg-pfgc: In the Linux kernel before 5↗2022-03-19
▶
OSV
CVE-2021-45868: In the Linux kernel before 5↗2022-03-18
▶

📋Vendor Advisories

6
Ubuntu
Linux kernel (AWS) vulnerabilities↗2023-04-12
▶
Ubuntu
Linux kernel vulnerabilities↗2023-04-12
▶
Ubuntu
Linux kernel (AWS) vulnerabilities↗2023-04-06
▶
Red Hat
kernel: fs/quota/quota_tree.c does not validate the block number in the quota tree↗2022-03-18
▶
Microsoft
In the Linux kernel before 5.15.3 fs/quota/quota_tree.c does not validate the block number in the quota tree (on disk). This can for example lead to a kernel/locking/rwsem.c use-after-free if there is↗2022-03-08
▶