CVE-2026-43216: net: Drop the lock in skb_may_tx_timestamp()

mediumCVSS 5.5CVE-2026-43216

CSIRTS triage

vendor: Linux product: Linux kernel networking Denial of service

What: Lock not properly released in skb_may_tx_timestamp() network function.
Who is affected: Linux systems with affected networking subsystem in kernel versions.
Urgency: Medium urgency; moderate CVSS score (5.5) and no active exploitation.
Action: Apply kernel patch to properly release lock in skb_may_tx_timestamp().

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43216

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-432160.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-43216	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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unknownDSA-6381-1 linux - security updatedebian

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