Medium [CVE-2026-47143] Denial of Service vulnerability via crafted input
This medium-severity Red Hat Linux advisory covers CVE-2026-47143 affecting Red Hat Hardened Images.
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Summary
Capstone is a disassembly framework.
Versions prior to 6.0.0-Alpha8 and 5.0.8 have a NULL pointer dereference in `modRMRequired()` and `decode()` when disassembling 3DNow! opcodes (`0F 0F`) in builds compiled with `-DCAPSTONE_X86_REDUCE`, allowing a remote attacker to crash any application using the reduced X86 Capstone library by supplying a crafted input containing the 4-byte sequence `0F 0F `.
This vulnerability only affects builds compiled with the -DCAPSTONE_X86_REDUCE flag; standard full builds are not vulnerable. Red Hat severity: Moderate — CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-476. Affected Red Hat products: Red Hat Hardened Images.
Red Hat fixing advisory: RHSA-2026:43841.
- < 6.0.0-Alpha8
- < 5.0.8
- 6.0.0
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
- capstone-main-5.0.8-0.1.hum1
- RHSA-2026:43841
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
Mitigation
Upgrade to a fixed release: capstone-main-5.0.8-0.1.hum1, RHSA-2026:43841. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
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