Bug 2181891 (CVE-2023-1637) - CVE-2023-1637 kernel: save/restore speculative MSRs during S3 suspend/resume
Summary: CVE-2023-1637 kernel: save/restore speculative MSRs during S3 suspend/resume
Keywords:
Status: NEW
Alias: CVE-2023-1637
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Nobody
QA Contact:
URL:
Whiteboard:
Depends On: 2181906 2181907 2181908 2181909 2226821 2230937 2230938 2232459 2232460 2181896
Blocks: 2077561
TreeView+ depends on / blocked
 
Reported: 2023-03-26 18:01 UTC by Alex
Modified: 2023-08-17 02:22 UTC (History)
45 users (show)

Fixed In Version: kernel 5.18-rc2
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the Linux kernel X86 CPU Power management when resuming CPU from suspend-to-RAM. This issue could allow a local user unauthorized access to memory from the CPU.
Clone Of:
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Description Alex 2023-03-26 18:01:16 UTC 
A flaw found in the Linux Kernel. After resuming from suspend-to-RAM, the MSRs that control CPU's speculative execution behavior are not being restored on the boot CPU.

These MSRs are used to mitigate speculative execution vulnerabilities. Not restoring them correctly may leave the CPU vulnerable. Secondary CPU's MSRs are correctly being restored at S3 resume by identify_secondary_cpu().

References:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e2a1256b17b16f9b9adf1b6fea56819e7b68e463
https://sourceware.org/bugzilla/show_bug.cgi?id=27398
Comment 3 Alex 2023-03-26 18:28:38 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2181896]
Comment 7 Justin M. Forbes 2023-04-04 13:26:31 UTC 
This was resolved for Fedora with the 5.16.20 stable kernel updates.
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