Security readout for executives and security teams
Plain-English summary
CVE-2026-28529 is a local privilege escalation flaw in cryptodev-linux 1.14 and earlier. A low-privileged local user with access to /dev/crypto may be able to gain higher privileges by abusing a memory lifetime bug in the driver.
Executive priority
High priority for any multi-user or shared Linux environment using cryptodev-linux. The business risk is local privilege escalation, which can turn a limited foothold into full host compromise.
Technical view
The issue is a CWE-416 use-after-free in get_userbuf, caused by unsafe page reference handling for /dev/crypto user buffers. The source bundle says controlled pages can have reference counts repeatedly decremented, enabling local privilege escalation. CVSS v4.0 is 8.5 high.
Likely exposure
Exposure is likely limited to Linux systems using cryptodev-linux 1.14 or earlier where untrusted local users, services, containers, or workloads can access /dev/crypto.
Exploitation context
The bundle includes public exploit-tagged references, but it does not cite CISA KEV listing or confirmed active exploitation. Treat public technical detail as raising urgency without claiming attacks in the wild.
Researcher notes
Evidence supports a local attack requiring low privileges and /dev/crypto access. The source bundle identifies the vulnerable function and CWE, but does not provide a named fixed version or confirmed exploitation-in-the-wild signal.
Mitigation direction
- Inventory systems for cryptodev-linux 1.14 or earlier.
- Check the cryptodev-linux project and PR 104 for vendor fix status.
- Apply the vendor-supported fixed release when available.
- Restrict /dev/crypto access to trusted users and workloads where operationally feasible.
- Prioritize shared servers, build hosts, and multi-tenant Linux environments.
Validation and detection
- Confirm whether the cryptodev-linux module is installed or loaded.
- Check installed cryptodev-linux version against 1.14 and earlier.
- Review permissions and access paths for /dev/crypto.
- Identify local users, services, or containers with /dev/crypto access.
- Track remediation evidence against the vendor project advisory or PR.
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.
CWE-416: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-28529 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
- High
- CVSS
- 8.5 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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
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:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
8.5HighVector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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://nasm.re/posts/cryptodev-linux-vuln/CVE reference, VulnCheck · technical-description, exploit
- https://gist.github.com/n4sm/0fd2479e0c23e0fa2f192cd8fda45750CVE reference, VulnCheck · exploit
- https://github.com/cryptodev-linux/cryptodev-linux/pull/104CVE reference, VulnCheck · issue-tracking
- https://www.vulncheck.com/advisories/cryptodev-linux-get-userbuf-use-after-free-lpeCVE reference, VulnCheck · third-party-advisory
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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.