Security readout for executives and security teams
Plain-English summary
This Linux kernel issue can leave CPU frequency policy resources locked after the amd-pstate-ut driver is loaded. In affected conditions, later amd_pstate mode changes can hang a task and may lead to a kernel panic or availability disruption. The provided sources do not show remote exploitation or active abuse.
Executive priority
Treat this as an availability risk, not a confirmed remote compromise issue. Prioritize patching where affected kernels run on AMD systems using amd-pstate testing or mode changes. Standard kernel update cycles may be sufficient for most environments unless uptime-sensitive systems match the exposure profile.
Technical view
The amd_pstate_ut_check_perf() and amd_pstate_ut_check_freq() paths call cpufreq_cpu_get() but fail to release the policy with cpufreq_cpu_put(). That leaked busy reference can block other policy users indefinitely, including cpufreq driver unregistration during amd_pstate mode changes. The fix adds the missing cpufreq_cpu_put() calls.
Likely exposure
Exposure appears limited to Linux systems running affected kernel versions with the amd-pstate-ut driver present and loaded, especially AMD pstate testing or tuning environments. The source bundle names affected Linux 6.1 through 6.6-related versions and stable commit fixes, but does not provide distribution package mapping.
Exploitation context
The bundle describes a reproducible kernel hang scenario after loading amd-pstate-ut and changing amd_pstate mode. It does not claim network reachability, privilege requirements, public exploit availability, or active exploitation. KEV status is false in the supplied data.
Researcher notes
The root cause is an unreleased cpufreq policy reference in amd-pstate-ut test paths. The observable failure is blocking in cpufreq policy cleanup during driver mode transition. Evidence is strong for the bug and fix, but incomplete for exploitability, privilege prerequisites, and downstream distro impact.
Mitigation direction
- Update to a kernel containing one of the referenced stable fixes.
- Check your Linux distribution advisory for backported fixed kernel packages.
- Avoid loading amd-pstate-ut on affected systems until patched.
- Prioritize systems where AMD pstate mode changes are operationally used.
Validation and detection
- Inventory Linux kernel versions against the affected and fixed ranges in vendor advisories.
- Confirm whether amd-pstate-ut is built, available, or loaded on relevant hosts.
- Review kernel logs for hung tasks involving cpufreq or amd_pstate mode changes.
- Validate remediation by checking installed kernel package changelogs for the referenced fixes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CVE-2023-53563 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
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Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/fcf78a17bbb94bebaa912f0460a1848f7d374c94CVE reference, Linux
- https://git.kernel.org/stable/c/84857640c67405eed258c461b3ef909002f1e201CVE reference, Linux
- https://git.kernel.org/stable/c/0f74f12ee042fd72e45f0e8700e063c84ef3883bCVE reference, Linux
- https://git.kernel.org/stable/c/60dd283804479c4a52f995b713f448e2cd65b8c8CVE reference, Linux
Products and packages named in the record
CWE details
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