Security readout for executives and security teams
Plain-English summary
A Linux Tegra cryptographic driver incorrectly advertised asynchronous operations as synchronous. The kernel could consequently select an incompatible implementation, causing crashes and potentially broader security effects reflected in the 8.8 CVSS score. Exposure appears limited to systems using the affected Tegra driver, but the supplied version data is ambiguous.
Executive priority
High priority for organizations operating Tegra-based Linux devices, especially exposed, shared, or safety-sensitive systems. Rapidly determine applicability, then schedule supported kernel updates. Systems without Tegra hardware or the relevant driver are less likely to be exposed, but that conclusion should be verified rather than assumed.
Technical view
The Tegra crypto driver omitted CRYPTO_ALG_ASYNC from asynchronous algorithm registrations. Linux Crypto API callers requesting synchronous algorithms could therefore receive an asynchronous implementation, creating an interface mismatch and at least kernel crashes. The published correction adds the missing flag and removes ignored CRYPTO_ALG_TYPE_* flags.
Likely exposure
Prioritize Linux systems with NVIDIA Tegra hardware where the Tegra crypto driver is present or active. The source lists 6.10, 6.12.81, 6.18.22, 6.19.12, 7.0, and an anomalous 0 as affected; it does not clearly define ranges. Confirm applicability against distribution advisories and stable-kernel commit ancestry.
Exploitation context
The supplied record says at least crashes can occur and assigns CVSS 8.8 with low complexity and limited privileges. It provides no exploit method or proof of confidentiality or integrity impact. The CVE is not marked as CISA KEV, and no supplied source establishes active exploitation.
Researcher notes
The documented root cause is algorithm capability misregistration, not a described memory-corruption primitive. Crashes are explicitly supported; confidentiality and integrity consequences are implied only by the CVSS metrics. The duplicated commit identifier, unusual version value 0, absent CPEs, and unclear version boundaries limit precise exposure mapping.
Mitigation direction
- Inventory Tegra-based Linux systems and record their running kernel builds.
- Check distribution or device-vendor advisories for CVE-2026-31739 applicability.
- Upgrade to a vendor-supported kernel containing the applicable cited stable fix.
- Prioritize externally reachable or multi-user Tegra systems until patched.
- Use vendor guidance for temporary controls if immediate kernel replacement is unavailable.
Validation and detection
- Confirm whether affected systems contain or load the Tegra crypto driver.
- Compare kernel source or package provenance with the cited stable fix commits.
- Verify asynchronous Tegra algorithms register with CRYPTO_ALG_ASYNC after remediation.
- Run approved regression testing for cryptographic workloads and kernel stability.
- Recheck vendor advisories because the supplied affected-version information is ambiguous.
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
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CVE-2026-31739 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9LinuxVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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/bdbf027a4504b4a86740de6beb6d18a957331839CVE reference, Linux
- https://git.kernel.org/stable/c/3aea268b6d5cde3b087df9eeecc3bc620aa09513CVE reference, Linux
- https://git.kernel.org/stable/c/429d05565eb19ee545d8a8395991372adbe4daf3CVE reference, Linux
- https://git.kernel.org/stable/c/4b56770d345524fc2acc143a2b85539cf7d74bc1CVE 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.