CVE-2024-35801x86/fpu: Keep xfd_state in sync with MSR_IA32_XFD
- 7.8HighCVSS base score
- 0.24%Exploitation in 30 daysEPSS · top 85% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
Published
- 24 months later
· 24 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.24% · top 85% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 672365477ae8afca5a1cca98c1deb733235e4525 – < 21c7c00dae55cb0e3810d5f9506b58f68475d41d
- affected 672365477ae8afca5a1cca98c1deb733235e4525 – < 1acbca933313aa866e39996904c9aca4d435c4cd
- affected 672365477ae8afca5a1cca98c1deb733235e4525 – < 92b0f04e937665bde5768f3fcc622dcce44413d8
- affected 672365477ae8afca5a1cca98c1deb733235e4525 – < b61e3b7055ac6edee4be071c52f48c26472d2624
- affected 672365477ae8afca5a1cca98c1deb733235e4525 – < 10e4b5166df9ff7a2d5316138ca668b42d004422
- affected 5.16
- unaffected < 5.16
- unaffected 6.1.84 – ≤ 6.1.*
- unaffected 6.6.24 – ≤ 6.6.*
- unaffected 6.7.12 – ≤ 6.7.*
- unaffected 6.8.3 – ≤ 6.8.*
- unaffected 6.9 – ≤ *
References
References5
- https://git.kernel.org/stable/c/21c7c00dae55cb0e3810d5f9506b58f68475d41d (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/1acbca933313aa866e39996904c9aca4d435c4cd (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/92b0f04e937665bde5768f3fcc622dcce44413d8 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/b61e3b7055ac6edee4be071c52f48c26472d2624 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/10e4b5166df9ff7a2d5316138ca668b42d004422 (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-35794 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-35801)Record last updated .