Security readout for executives and security teams
Plain-English summary
This Linux kernel issue can crash affected systems during TPM-backed trusted key operations. It is most relevant where TPM trusted keys are used for sealing or unsealing secrets. The public record does not provide CVSS, a CWE, or evidence of active exploitation.
Executive priority
Treat this as a targeted reliability and availability issue, not a broad emergency based on current evidence. Prioritize patching where TPM-backed trusted keys protect operational secrets or uptime matters.
Technical view
A trusted keys regression lost a TPM reservation call in tpm2_seal_trusted(). Later cleanup could release TPM ops without a matching acquire, causing kernel oopses on TIS-based TPM hardware. Stable kernel fixes restore the missing tpm_try_get_ops() handling.
Likely exposure
Exposure appears limited to Linux systems using TPM trusted keys, especially with TIS-based TPM hardware. The bundle does not provide CPEs, distribution package names, or complete affected version ranges.
Exploitation context
The CVE is not listed as KEV in the bundle. The sources describe kernel oopses from an internal TPM operation imbalance, not confirmed active exploitation or remote attack behavior.
Researcher notes
The public bundle is sparse: no CVSS, CWE, CPEs, exploit evidence, or distro mappings. Analysis should stay anchored to the kernel trusted keys TPM reservation regression and the referenced stable fixes.
Mitigation direction
- Apply vendor or distribution kernels containing the referenced stable fixes.
- Prioritize systems using TPM trusted keys for sealing or unsealing secrets.
- Check Linux distribution advisories for exact fixed package versions.
- Avoid inventing compensating controls beyond vendor guidance.
- Schedule reboot validation after kernel update where required.
Validation and detection
- Inventory Linux kernel versions on systems using TPM-backed trusted keys.
- Compare installed kernels against vendor fixed builds and stable commits.
- Check whether hardware uses TIS-based TPM interfaces.
- Review kernel logs for TPM trusted-key oopses or related crashes.
- Confirm trusted key seal and unseal workflows after patching.
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
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-46922 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
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.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/bf84ef2dd2ccdcd8f2658476d34b51455f970ce4CVE reference, Linux
- https://git.kernel.org/stable/c/39c8d760d44cb3fa0d67e8cd505df81cf4d80999CVE reference, Linux
- https://git.kernel.org/stable/c/9d5171eab462a63e2fbebfccf6026e92be018f20CVE reference, Linux
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.