Bug 2525417 (CVE-2026-80640) - CVE-2026-80640 kernel: cxl/fwctl: Fix __fortify_panic
Summary: CVE-2026-80640 kernel: cxl/fwctl: Fix __fortify_panic
Keywords:
Status: NEW
Alias: CVE-2026-80640
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-28 07:43 UTC by OSIDB Bzimport
Modified: 2026-08-31 12:28 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-08-28 07:43:56 UTC 
In the Linux kernel, the following vulnerability has been resolved:

cxl/fwctl: Fix __fortify_panic

Fix a runtime assertion in cxlctl_get_supported_features(). Fortify
complains that it is potentially overflowing the entries array per
__counted_by_le(num_entries). Quiet the false positive by initializing
@num_entries earlier.

 memcpy: detected buffer overflow: 48 byte write of buffer size 0
 WARNING: lib/string_helpers.c:1036 at __fortify_report+0x4d/0xa0, CPU#7: fwctl/1398
 RIP: 0010:__fortify_report+0x50/0xa0
 Call Trace:
  __fortify_panic+0xd/0xf
  cxlctl_get_supported_features.cold+0x23/0x35 [cxl_core]
Comment 1 gkamathe 2026-08-31 12:19:46 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082841-CVE-2026-80640-36d9@gregkh/T
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