Security readout for executives and security teams
Plain-English summary
CVE-2020-29368 is a Linux kernel memory-management flaw fixed before kernel 5.7.5. A race condition in copy-on-write handling for Transparent Huge Pages could grant unintended write access. The source bundle does not provide CVSS, confirmed affected distributions, or active exploitation evidence.
Executive priority
Treat this as a kernel hygiene issue with moderate urgency. It affects a core memory-protection path, but the provided evidence lacks CVSS, confirmed product scope, and active exploitation claims.
Technical view
The issue is in __split_huge_pmd in mm/huge_memory.c. The copy-on-write implementation used a THP mapcount check with a race condition, allowing unintended write access. The linked upstream commit and Linux 5.7.5 changelog are the primary fix references.
Likely exposure
Potential exposure is Linux systems running affected upstream kernels before 5.7.5 or downstream builds that had not backported the fix. Exact vendor, appliance, and distribution impact is not established in the provided CVE data.
Exploitation context
The CVE is not marked in KEV, and the provided bundle does not cite active exploitation. A Project Zero issue is referenced, indicating public technical discussion, but the bundle does not prove weaponized or in-the-wild use.
Researcher notes
Focus analysis on THP, copy-on-write, and the __split_huge_pmd mapcount race. Avoid assuming distribution exposure from upstream version alone because vendors may backport fixes without changing major kernel versions.
Mitigation direction
- Check vendor advisories for kernel packages and backported fixes.
- Upgrade or patch kernels to a fixed vendor-supported build.
- Prioritize internet-facing multi-user hosts and shared compute environments.
- Review NetApp guidance if using affected NetApp-supported systems.
Validation and detection
- Inventory Linux kernel versions across servers and appliances.
- Confirm whether vendor kernels include the upstream fix commit.
- Check package changelogs for CVE-2020-29368 or CID-c444eb564fb1.
- Document systems still running kernels predating 5.7.5 without backport evidence.
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-2020-29368 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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.7.5CVE reference · x_refsource_MISC
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c444eb564fb16645c172d550359cb3d75fe8a040CVE reference · x_refsource_MISC
- https://bugs.chromium.org/p/project-zero/issues/detail?id=2045CVE reference · x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20210108-0002/CVE reference · x_refsource_CONFIRM
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.