CVE-2026-53263: 6lowpan: fix off-by-one in multicast context address compression

mediumCVSS 5.5CVE-2026-53263

CSIRTS triage

vendor: Linux product: 6lowpanOther

What: An off-by-one error exists in multicast context address compression.
Who is affected: Users of the 6lowpan driver are affected.
Urgency: Remediation is medium urgency due to a CVSS score of 5.5.
Action: Update the driver to the latest version that includes the fix.

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: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53263

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-2026-532630.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-53263	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownMultiple vulnerabilities in Microsoft Azure Linux (June 29, 2026)cert-fr-avis

Recent advisories for 6lowpan

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-12633: The IPv6 neighbor-discovery code in subsys/net/ip/ipv6_nbr.c processes the 6LoWPAN Context Opt…nvd · 2026-08-19
mediumCVE-2026-12630: Zephyr's 6LoWPAN IP Header Compression (IPHC) uncompression code contains an out-of-bounds rea…nvd · 2026-08-17
unknownCVE-2026-72337: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: 6lowpan: avoid …nvd · 2026-08-15
unknownCVE-2026-72336: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: 6lowpan: hold L…nvd · 2026-08-15
mediumCVE-2026-64452: 6lowpan: fix NHC entry use-after-free on error pathmsrc · 2026-08-06
highCVE-2026-64452: In the Linux kernel, the following vulnerability has been resolved: 6lowpan: fix NHC entry use…nvd · 2026-07-25