Review reviewHigh

CVE-2023-1281

Linux Linux Kernel, linux kernel

Use After Free vulnerability in Linux kernel traffic control index filter (tcindex) allows Privilege Escalation. The imperfect hash area can be updated while packets are traversing, which will cause a use-after-free when 'tcf_exts_exec()' is called with the destroyed tcf_ext. A local attacker user can use this vulnerability to elevate its privileges to root. This issue affects Linux Kernel: from 4.14 before git commit ee059170b1f7e94e55fa6cadee544e176a6e59c2.

CVSS: 7.8
EPSS: 0.31%
CISA KEV: Not listed
Published: 2023.03.22

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.31%

Technical severityCVSS 7.8

Vulnerability overview

Affected product and versions

Product: Linux Linux Kernel, linux kernel
Affected versions: >= 4.14.0 < 5.10.169, >= 5.11.0 < 5.15.95, >= 5.16.0 < 6.1.13, >= 4.14 < 5.10.169, >= 5.11 < 5.15.95, >= 5.16 < 6.1.13, 6.2
Fixed versions: 5.10.169, 5.15.95, 6.1.13

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Linux Linux Kernel, linux kernel and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-416