relibc CVE-2026-38641
HIGHSeverity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Triggering requires supplying a crafted library to a loading process, implying local, low-privilege access (AV:L/PR:L); impact is availability-only crash, so C:N/I:N/A:H.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3DescriptionCVE.org
An issue in the DSO::mmap_and_copy function of relibc commit 61f42d allows attackers to cause a Denial of Service (DoS) via loading a crafted shared library.
AnalysisAI
Denial of service in relibc (the Redox OS C standard library) at commit 61f42d allows attackers to crash a process by getting it to load a maliciously crafted shared library, which mishandles resources in the DSO::mmap_and_copy dynamic-linking routine (CWE-404). Publicly available exploit code exists, but the flaw is not in CISA KEV and EPSS is very low (0.17%, 6th percentile), indicating no observed in-the-wild exploitation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim process to load an attacker-controlled or crafted shared library through relibc's dynamic loader (the DSO::mmap_and_copy path); the attacker must therefore be able to supply or influence the .so file that is loaded. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals conflict on attack vector: the supplied CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:N/A:H (7.5), but the described trigger - getting a process to load a crafted shared library - is inherently a local/operator-controlled action, so AV:N likely overstates remote reachability; verify with the vendor. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a malformed ELF shared object and arranges for a relibc-based process on Redox OS to load it - for example by placing it on a library search path or passing it to a program that dlopen()s untrusted paths. When the dynamic loader reaches DSO::mmap_and_copy, the malformed segment data triggers the resource-handling fault and crashes the process, denying service. … |
| Remediation | Upstream fix available (PR/commit); released patched version not independently confirmed - apply the change from the Redox relibc merge request at https://gitlab.redox-os.org/redox-os/relibc/-/merge_requests/1046 (tracking issue https://gitlab.redox-os.org/redox-os/relibc/-/issues/263) by rebuilding relibc past the fixing commit, since no tagged patched release version is provided in the data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory systems running Redox OS and classify by operational criticality. …
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Same weakness CWE-404 – Improper Resource Shutdown or Release
View allSame technique Denial Of Service
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External POC / Exploit Code
Leaving vuln.today