Security readout for executives and security teams
Plain-English summary
This Linux kernel issue can cause a kernel panic, meaning an affected system may crash. The source describes a flaw in ch_ktls transmit handling where memory cleanup can race with network acknowledgement processing. No CVSS score or exploitation evidence is provided.
Executive priority
Prioritize remediation where Linux host crashes would disrupt production services. Without exploitation evidence or CVSS, this should be handled through planned kernel maintenance, accelerated for critical systems using the affected path.
Technical view
The resolved bug is in ch_ktls. Taking a page refcount during skb transmit could still allow page cleanup if an ACK arrived mid-transmit, sometimes causing kernel panic. The fix takes the tx_ctx lock for the full skb transmit operation.
Likely exposure
Exposure appears limited to Linux kernels and configurations exercising the affected ch_ktls kernel TLS transmit path. The bundle lists affected Linux versions including 5.7, 5.10.32, 5.11.16, and 5.12, but gives incomplete version-range context.
Exploitation context
The source bundle does not show active exploitation, KEV listing, public exploit availability, or attacker prerequisites. Treat this as a stability and availability risk unless vendor advisories provide stronger evidence.
Researcher notes
Evidence is sparse. The CVE record describes a kernel panic fix, affected Linux versions, and stable commit references, but provides no CVSS, CWE, proof of exploitation, or detailed attack model. Avoid assuming remote reachability without local environment confirmation.
Mitigation direction
- Identify systems running affected Linux kernel versions.
- Check whether ch_ktls or related kernel TLS transmit paths are used.
- Apply vendor kernel updates containing the referenced stable fixes.
- Prioritize internet-facing or availability-critical Linux hosts.
- Monitor vendor advisories for distribution-specific fixed packages.
Validation and detection
- Inventory Linux kernel versions across servers and appliances.
- Map each kernel to distribution advisory status and fixed package versions.
- Review crash logs for kernel panic traces involving ch_ktls.
- Confirm patched kernels include one of the referenced stable commits.
- Regression test TLS workloads after kernel update.
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-2021-46911 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/8d5a9dbd2116a852f8f0f91f6fbc42a0afe1091fCVE reference, Linux
- https://git.kernel.org/stable/c/8348665d4181c68b0ca1205b48e1753d78bc810fCVE reference, Linux
- https://git.kernel.org/stable/c/1a73e427b824133940c2dd95ebe26b6dce1cbf10CVE 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.