Kernel faults via premature qeth work-item free
Published Oct 21, 2024 · Updated Aug 5, 2026
Linux s390 qeth use-after-free in 5.15 before 5.15.83, 5.16 before 6.0.13, and 6.1-rc1 through 6.1-rc8 allows local users to trigger kernel faults. The qeth_l2_br2dev_worker function retains addr inside br2dev_event_work, frees that work item before processing, and then dereferences the dangling address during bridge-to-device MAC updates. Reachability requires an s390 qeth interface acting as a bridge port with learning synchronization; KASAN confirms the post-free read, but no reliable privilege-escalation path is documented.
Summary
What happened
Linux s390 qeth use-after-free in 5.15 before 5.15.83, 5.16 before 6.0.13, and 6.1-rc1 through 6.1-rc8 allows local users to trigger kernel faults. The qeth_l2_br2dev_worker function retains addr inside br2dev_event_work, frees that work item before processing, and then dereferences the dangling address during bridge-to-device MAC updates. Reachability requires an s390 qeth interface acting as a bridge port with learning synchronization; KASAN confirms the post-free read, but no reliable privilege-escalation path is documented.
The record
- CVE
- CVE-2022-48954
- Published
- Oct 21, 2024
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-416
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 21, 2024CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=5.15
- Affected versionversion=f7936b7b2663c99a096a5c432ba96ab1e91a6c0f <bde0dfc7c4569406a6ddeec363d04a1df7b3073f
- Affected versionversion=f7936b7b2663c99a096a5c432ba96ab1e91a6c0f <db6343a5b0d9661f2dd76f653c6d274d38234d2b
- Affected versionversion=f7936b7b2663c99a096a5c432ba96ab1e91a6c0f <ebaaadc332cd21e9df4dcf9ce12552d9354bbbe4
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo