Security readout for executives and security teams
Plain-English summary
A Linux kernel cryptography bug can reassign one more memory page than intended. A local, low-privileged user may be able to trigger serious confidentiality, integrity, or availability impact. The supplied record rates it 7.8 High, but does not establish real-world exploitation.
Executive priority
Treat as a high-priority kernel maintenance issue, especially on multi-user or shared-compute Linux systems. It is not supported as an emergency internet-wide threat because exploitation requires local access and active exploitation is not reported. Promptly establish inventory, obtain distribution-specific fixed-version guidance, and schedule upgrades according to local-user exposure.
Technical view
The flaw is in crypto/af_alg function af_alg_pull_tsgl. A loop omitted a boundary check after page reassignment was introduced, allowing one unnecessary page reassignment. The kernel fix adds the missing check. The supplied CVSS vector indicates local access, low complexity, low privileges, no user interaction, unchanged scope, and high impact.
Likely exposure
Exposure is limited to affected Linux kernels where an attacker already has low-privileged local access and can reach the relevant AF_ALG functionality. The supplied affected-version data is ambiguous and includes commit identifiers and loosely structured version values, so exact exposure should be confirmed against Linux or distribution advisories.
Exploitation context
The supplied record does not report active exploitation, and CVE-2026-43078 is not marked as CISA KEV. No public exploit evidence is included. Its local, low-privilege attack requirements make shared Linux systems and hosts permitting untrusted local users more concerning than systems without such access.
Researcher notes
The root cause is an off-by-one-style page reassignment condition in af_alg_pull_tsgl. Eight stable-kernel commits are referenced, indicating fixes across branches, but the bundle does not reliably map them to corrected release versions. No CWE, crash trace, proof of concept, exploitation telemetry, or detailed primitive is supplied.
Mitigation direction
- Install a vendor-supported kernel containing the applicable upstream stable fix.
- Consult the Linux distribution advisory for exact affected and corrected package versions.
- Prioritize shared systems and hosts that permit untrusted local users.
- Use normal change controls and reboot if required to activate the corrected kernel.
Validation and detection
- Record each host's running kernel version and distribution package release.
- Compare installed packages with authoritative Linux distribution advisories for CVE-2026-43078.
- Confirm the running kernel includes the distribution backport or applicable upstream fix.
- Verify systems booted into the corrected kernel after maintenance.
- Monitor vendor guidance because the supplied affected-version data is not definitive.
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-2026-43078 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
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9LinuxVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/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/fa48d3ea9cdbfb28c1fd6756c6c5cd01351aa51eCVE reference, Linux
- https://git.kernel.org/stable/c/2b781d1d4f933990318bcc5c68fb75a717379e42CVE reference, Linux
- https://git.kernel.org/stable/c/f7826bc0b39928a4a22f6b815dd9940b22a63503CVE reference, Linux
- https://git.kernel.org/stable/c/710a4ce5d7afd9fe082c75dec282ab4a11c0fe71CVE reference, Linux
- https://git.kernel.org/stable/c/c8369a6d62f5abde9cbd4b62c45bf4b996be2468CVE reference, Linux
- https://git.kernel.org/stable/c/dea5fcf085f977b6c2de1b2d4ec4767b6c840d1fCVE reference, Linux
- https://git.kernel.org/stable/c/9532501e0f1b200ea80baa0e33e0b06da10bb271CVE reference, Linux
- https://git.kernel.org/stable/c/31d00156e50ecad37f2cb6cbf04aaa9a260505efCVE 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.