Bug 2536596 (CVE-2026-92518) - CVE-2026-92518 kernel: riscv, bpf: Fix kernel stack corruption in tailcall with CFI
Summary: CVE-2026-92518 kernel: riscv, bpf: Fix kernel stack corruption in tailcall wi...
Keywords:
Status: NEW
Alias: CVE-2026-92518
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 18:38 UTC by OSIDB Bzimport
Modified: 2026-10-20 11:24 UTC (History)
17 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-09-17 18:38:33 UTC 
In the Linux kernel, the following vulnerability has been resolved:

riscv, bpf: Fix kernel stack corruption in tailcall with CFI

When CONFIG_CFI_CLANG is enabled, prog->bpf_func already skips the kcfi
instruction during setup. Including it again in the tailcall jump offset
causes it to jump over an extra 4 bytes, skipping the stack pointer
adjustment, which will result in kernel stack corruption.
Comment 1 gkamathe 2026-09-21 05:27:53 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-92518.mbox
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