CVE-2026-63827: apparmor: fix use-after-free in rawdata dedup loop
CSIRTS triage
- What
- A use-after-free vulnerability exists in the rawdata deduplication loop.
- Who is affected
- Deployments of apparmor are affected.
- Urgency
- Remediation is critical as use-after-free vulnerabilities can lead to exploitation.
- Action
- Apply the latest patches to address the vulnerability.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63827
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-2026-638270.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-63827 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
Recent advisories for apparmor
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.
- mediumCVE-2024-5300: An access control bypass and information disclosure vulnerability exists in the base AppArmor s…nvd · 2026-07-21
- highCVE-2026-63828: In the Linux kernel, the following vulnerability has been resolved: apparmor: mediate the impl…nvd · 2026-07-19
- highCVE-2026-63827: In the Linux kernel, the following vulnerability has been resolved: apparmor: fix use-after-fr…nvd · 2026-07-19
- criticalCVE-2026-63828: apparmor: mediate the implicit connect of TCP fast open sendmsgmsrc · 2026-07-14
- mediumCVE-2026-46254: AppArmor: Allow apparmor to handle unaligned dfa tablesmsrc · 2026-06-09
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