Security readout for executives and security teams
Plain-English summary
CVE-2026-23195 is a high-severity Linux kernel use-after-free in cgroup/dmem. A local authenticated attacker could potentially affect confidentiality, integrity, and availability on vulnerable kernels. The issue is not listed as CISA KEV in the provided sources, so active exploitation is not established here.
Executive priority
Prioritize remediation in the next high-severity kernel patch cycle, especially on multi-user, hosting, CI, or workload-consolidation systems. Immediate emergency action is not supported unless local attacker presence or suspicious kernel crashes are observed.
Technical view
The flaw is in Linux kernel cgroup/dmem pool lifetime handling. A pool may be freed after its memory region is unregistered while callers still hold references, leading to use-after-free during uncharge operations. The cited fix adds pool reference counting so freeing occurs only after references drop to zero.
Likely exposure
Exposure is most relevant to Linux systems running affected kernel versions or commits identified by the CVE record. Risk increases where local users or untrusted workloads can execute code. Network-only exposure is not supported by the CVSS vector.
Exploitation context
The CVSS vector is local, high complexity, low privileges, and no user interaction. Provided sources do not show public exploitation, weaponized proof of concept, or KEV listing. Treat exploitation feasibility as plausible but not confirmed from this bundle.
Researcher notes
The source evidence identifies a KASAN-detected slab use-after-free in page_counter_uncharge through dmem_cgroup_uncharge. The root cause is pool lifetime mismanagement after memory-region unregister. The fix direction is reference counting, but downstream vendor backport status must be verified separately.
Mitigation direction
- Identify Linux hosts running affected kernel versions or commits.
- Review the referenced kernel stable commits and vendor advisories.
- Apply vendor-supported kernel updates that include the cgroup/dmem fix.
- Prioritize shared systems with local users or untrusted workloads.
- Use normal change control and reboot planning for kernel updates.
Validation and detection
- Inventory running kernel versions across Linux assets.
- Map kernel builds to the CVE affected version data.
- Confirm whether vendor packages include the referenced stable fixes.
- Check for kernel crash reports matching cgroup/dmem use-after-free symptoms.
- Document systems deferred from patching and compensating access controls.
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-2026-23195 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 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/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:H/PR:L/UI:N/S:U/C:H/I:H/A:H15.9LinuxVulnerability scoring details
Base CVSS 3.1 score
7HighVector: CVSS:3.1/AV:L/AC:H/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/d3081353acaa6a638dcf75726066ea556a2de8d5CVE reference, Linux
- https://git.kernel.org/stable/c/99a2ef500906138ba58093b9893972a5c303c734CVE 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.