#VU92895 Use-after-free in Linux kernel - CVE-2022-48733

Vulnerability identifier: #VU92895

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-48733

CWE-ID: CWE-416

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the btrfs_wait_delalloc_flush() and btrfs_commit_transaction() functions in fs/btrfs/transaction.c, within the create_snapshot() function in fs/btrfs/ioctl.c. A local user can escalate privileges on the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

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External links
https://git.kernel.org/stable/c/a7b717fa15165d3d9245614680bebc48a52ac05d
https://git.kernel.org/stable/c/9372fa1d73da5f1673921e365d0cd2c27ec7adc2
https://git.kernel.org/stable/c/28b21c558a3753171097193b6f6602a94169093a

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.