Vulnerability CVE-2021-45868
Published: 2022-03-18

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.

Type:

CWE-416

 (Use After Free)

CVSS2 => (AV:N/AC:M/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Linux -> Linux kernel 

 References:
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.3
https://www.openwall.com/lists/oss-security/2022/03/17/2
https://www.openwall.com/lists/oss-security/2022/03/17/1
https://bugzilla.kernel.org/show_bug.cgi?id=214655
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9bf3d20331295b1ecb81f4ed9ef358c51699a050
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