Low [CVE-2026-13574] Denial of service via heap-based buffer overflow in Bitcode File Handler
This low-severity Red Hat Linux advisory covers CVE-2026-13574 affecting Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8.
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Summary
A vulnerability was determined in llvm llvm-project up to 22.1.6. This impacts the function GCRelocateInst::getBasePtr in the library llvm/lib/IR/IntrinsicInst.cpp of the component Bitcode File Handler.
This manipulation causes heap-based buffer overflow. It is possible to launch the attack on the local host.
The exploit has been publicly disclosed and may be utilized. There are still doubts about whether this vulnerability truly exists.
The LLVM project explains, that the reported behavior is outside its documented security scope and therefore not considered a security vulnerability. This flaw could lead to a denial of service, making the affected system unavailable.
Red Hat severity: Low — CVSS 3.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L). Weakness: CWE-805.
Affected Red Hat products: Red Hat Hardened Images; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4. Red Hat lists Red Hat AI Inference Server; Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat OpenShift AI (RHOAI) as not affected.
Red Hat fixing advisory: RHSA-2026:24069, RHSA-2026:7634.
Affected products named by the advisory: Red Hat package: llvm.
- 22.1.6
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
- llvm21-main-21.1.8-6.hum1
- llvm-main-21.1.8-1.1.hum1
- RHSA-2026:24069
- RHSA-2026:7634
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Mitigation
Upgrade to a fixed release: llvm21-main-21.1.8-6.hum1, llvm-main-21.1.8-1.1.hum1, RHSA-2026:24069, RHSA-2026:7634. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
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