CVE-2024-35801: x86/fpu: Keep xfd_state in sync with MSR_IA32_XFD
First published: Fri May 17 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: x86/fpu: Keep xfd_state in sync with MSR_IA32_XFD Commit 672365477ae8 ("x86/fpu: Update XFD state where required") and commit 8bf26758ca96 ("x86/fpu: Add XFD state to fpstate") introduced a per CPU variable xfd_state to keep the MSR_IA32_XFD value cached, in order to avoid unnecessary writes to the MSR. On CPU hotplug MSR_IA32_XFD is reset to the init_fpstate.xfd, which wipes out any stale state. But the per CPU cached xfd value is not reset, which brings them out of sync. As a consequence a subsequent xfd_update_state() might fail to update the MSR which in turn can result in XRSTOR raising a #NM in kernel space, which crashes the kernel. To fix this, introduce xfd_set_state() to write xfd_state together with MSR_IA32_XFD, and use it in all places that set MSR_IA32_XFD.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.1.84 | 6.1.84 |
| redhat/kernel | <6.6.24 | 6.6.24 |
| redhat/kernel | <6.7.12 | 6.7.12 |
| redhat/kernel | <6.8.3 | 6.8.3 |
| redhat/kernel | <6.9 | 6.9 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.11-1 6.12.12-1 |
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Reference Links
- https://git.kernel.org/stable/c/10e4b5166df9ff7a2d5316138ca668b42d004422
- https://git.kernel.org/stable/c/1acbca933313aa866e39996904c9aca4d435c4cd
- https://git.kernel.org/stable/c/21c7c00dae55cb0e3810d5f9506b58f68475d41d
- https://git.kernel.org/stable/c/92b0f04e937665bde5768f3fcc622dcce44413d8
- https://git.kernel.org/stable/c/b61e3b7055ac6edee4be071c52f48c26472d2624
- https://launchpad.net/bugs/cve/CVE-2024-35801
- https://access.redhat.com/security/cve/CVE-2024-35801
- https://lore.kernel.org/linux-cve-announce/2024051738-CVE-2024-35801-8038@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2281236
- https://access.redhat.com/errata/RHSA-2024:5102
- https://access.redhat.com/errata/RHSA-2024:5101
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2281235
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-35801
- https://nvd.nist.gov/vuln/detail/CVE-2024-35801
- https://security-tracker.debian.org/tracker/CVE-2024-35801
- https://ubuntu.com/security/CVE-2024-35801
- https://git.kernel.org/linus/10e4b5166df9ff7a2d5316138ca668b42d004422
Frequently Asked Questions
What is the severity of CVE-2024-35801?
CVE-2024-35801 is classified as a medium severity vulnerability in the Linux kernel.
How do I fix CVE-2024-35801?
To fix CVE-2024-35801, update to kernel version 6.1.84 on Red Hat systems or appropriate versions as specified.
What products are affected by CVE-2024-35801?
CVE-2024-35801 affects various versions of the Linux kernel, specifically those listed in the vulnerability details.
Is my system vulnerable to CVE-2024-35801?
You may be vulnerable to CVE-2024-35801 if you are running an affected version of the Linux kernel prior to the recommended updates.
What type of vulnerability is CVE-2024-35801?
CVE-2024-35801 is an issue related to synchronization of the xfd_state in the x86 floating-point unit of the Linux kernel.
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