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01 Record

CVE-2026-19938

Use-after-free of an ATT PDU buffer when signing an outgoing Bluetooth ATT Signed Write Command fails

MediumPUBLISHEDCNA: zephyr
CNA base score5.9 CVSS v3.xCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

02 Description

Use-after-free of an ATT PDU buffer when signing an outgoing Bluetooth ATT Signed Write Command fails

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.16% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 4.9% of scored records. A rank, not a probability.
NVD base score
5.9 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
NVD analysis status
Awaiting Analysis. NVD last modified this record on 2026-10-14.
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.

04 Metadata

Published
2026-10-12 23:19Z16 DAYS AGO
Last updated
2026-10-14 19:17Z14 DAYS AGO
Reserved
2026-08-15
Assigning CNA
zephyr
Record state
PUBLISHED
Severity
Medium (CVSS 5.9)
CNA CVSS vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Weaknesses
Data version
5.2
Document digest
ac4c183be57a1a953e2744ecca9ca9d0f9a8d6b804439f803067d278390a78a1

05 Affected products

VendorProductVersionsPlatforms
zephyrprojectzephyr2.3.0 to < 4.5.0—

06 References