CVE-2026-49421
CVE-2026-49421 is a security vulnerability that is still awaiting full analysis and scoring. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-273.
Key facts
- EPSS exploit prediction: 0% (3rd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-273
- Published:
- Last modified:
Description
The kernel function that implements unlinkat(2) and funlinkat(2) validated the AT_RESOLVE_BENEATH flag but failed to pass it through to the underlying path lookup. The flag was silently dropped, so path resolution was not actually restricted. A process that uses AT_RESOLVE_BENEATH with unlinkat(2) or funlinkat(2) to confine path resolution can in fact resolve paths above the starting directory. A caller relying on this flag for path containment may delete files outside the intended directory tree.
Frequently asked questions
- What is CVE-2026-49421?
- The kernel function that implements unlinkat(2) and funlinkat(2) validated the AT_RESOLVE_BENEATH flag but failed to pass it through to the underlying path lookup. The flag was silently dropped, so path resolution was not actually restricted. A process that uses AT_RESOLVE_BENEATH with unlinkat(2) or funlinkat(2) to confine path resolution can in fact resolve paths above the starting directory. A caller relying on this flag for path containment may delete files outside the intended directory tree.
- Is CVE-2026-49421 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-49421?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2026-49421 published?
- CVE-2026-49421 was published on 2026-08-19.
References
Other CWE-273 vulnerabilities
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- CVE-2020-24361 — Critical (CVSS 9.8): SNMPTT before 1.4.2 allows attackers to execute shell code via EXEC, PREXEC, or unknown_trap_exec.
- CVE-2011-3350 — Critical (CVSS 9.8): masqmail 0.2.21 through 0.2.30 improperly calls seteuid() in src/log.c and src/masqmail.c that results in improper…
- CVE-2011-2921 — Critical (CVSS 9.8): ktsuss versions 1.4 and prior has the uid set to root and does not drop privileges prior to executing user specified…