Bug 2297528 (CVE-2024-40944) - CVE-2024-40944 kernel: x86/kexec: Fix bug with call depth tracking
Summary: CVE-2024-40944 kernel: x86/kexec: Fix bug with call depth tracking
Keywords:
Status: NEW
Alias: CVE-2024-40944
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
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Blocks:
TreeView+ depends on / blocked
 
Reported: 2024-07-12 13:37 UTC by OSIDB Bzimport
Modified: 2024-07-29 21:08 UTC (History)
4 users (show)

Fixed In Version: kernel 6.6.35, kernel 6.9.6, kernel 6.10-rc3
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Description OSIDB Bzimport 2024-07-12 13:37:35 UTC 
In the Linux kernel, the following vulnerability has been resolved:

x86/kexec: Fix bug with call depth tracking

The call to cc_platform_has() triggers a fault and system crash if call depth
tracking is active because the GS segment has been reset by load_segments() and
GS_BASE is now 0 but call depth tracking uses per-CPU variables to operate.

Call cc_platform_has() earlier in the function when GS is still valid.

  [ bp: Massage. ]
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