Bug 2536172 (CVE-2026-93147) - CVE-2026-93147 kernel: s390/bpf: Replace ly instruction with llgf
Summary: CVE-2026-93147 kernel: s390/bpf: Replace ly instruction with llgf
Keywords:
Status: NEW
Alias: CVE-2026-93147
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-17 16:41 UTC by OSIDB Bzimport
Modified: 2026-10-20 11:44 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-09-17 16:41:29 UTC 
In the Linux kernel, the following vulnerability has been resolved:

s390/bpf: Replace ly instruction with llgf

cpu_nr is a 32 bit value and BPF_REG_0 is a 64 bit register, when ly loads
the cpu_nr into BPF_REG_0 it does not zero the upper bits, but llgf does.
Comment 1 gkamathe 2026-09-18 20:31:53 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93147.mbox
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