04 Affected products
PAIRS: —
01 RecordSTATE: PUBLISHED
02 Description
CNA: zephyrTOCTOU race in mbox_send syscall verifier allows userspace to leak kernel memory
03 Exploitation and scoring
SRC: CISA, FIRST, NVD, RED HAT- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- Not scored by EPSS
- EPSS percentile
- Not scored by EPSS
- NVD base score
- The NVD has published no score for this record
- NVD CVSS vector
- No NVD score to derive
- NVD analysis status
- Not recorded
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
SCHEMA: 5.2
- Published
- 2026-08-24 14:28Z25 MIN AGO
- Last updated
- 2026-08-24 14:28Z25 MIN AGO
- Reserved
- 2026-05-27
- Assigning CNA
- zephyr
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 6.4)
- CNA CVSS vector
- CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:L
- Weaknesses
- CWE-367Time-of-check Time-of-use (TOCTOU) Race ConditionBase
- Data version
- 5.2
- Document digest
- a4ad5f3c0d948d35bb00acf1b37e3cdf847cb9b66a4c80b8b1ecc86e9b3ac80a
05 Affected products
PAIRS: 1VendorProductVersionsPlatforms
zephyrprojectzephyr3.0.0 to < 4.4.2—