CVE-2026-80640 PUBLISHED

cxl/fwctl: Fix __fortify_panic

Assigner: Linux
Reserved: 26.08.2026 Published: 28.08.2026 Updated: 28.08.2026

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]

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 4d1c09cef2c244bd19467c016a3e56ba28ecc59d to b8d15e85596ad8993d42e0703a9741961a2f03eb (excl.)
  • affected from 4d1c09cef2c244bd19467c016a3e56ba28ecc59d to 18c67ecc5dafe14055edcea53f36f4e31df1816b (excl.)
  • affected from 4d1c09cef2c244bd19467c016a3e56ba28ecc59d to 6c9d2e87df40d606f1c85143e9acb1ecff463d5e (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 6.15 is affected
  • unaffected from 0 to 6.15 (excl.)
  • unaffected from 6.18.40 to 6.18.* (incl.)
  • unaffected from 7.1.5 to 7.1.* (incl.)
  • unaffected from 7.2 to * (incl.)

References