CVE-2026-63937
- Source
- https://cve.org/CVERecord?id=CVE-2026-63937
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63937.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-63937
- Downstream
- Published
- 2026-07-19T14:55:34.554Z
- Modified
- 2026-07-22T05:30:02.399051115Z
- Severity
-
- 8.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
- Summary
- KVM: SEV: Use READ_ONCE() when reading entries/indices from PSC buffer
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
KVM: SEV: Use READ_ONCE() when reading entries/indices from PSC buffer
Use READ_ONCE() when reading entries/indices from the guest-accessible Page State Change buffer to defend against TOCTOU bugs.
Don't bother with READONCE()/WRITEONCE() for cases where KVM is writing (and not consuming the result!), as the guest isn't supposed to touch the buffer while it's being processed. I.e. using READ_ONCE() is all about protecting against misbehaving guests.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63937.json", "cna_assigner": "Linux" }- References
-
- https://git.kernel.org/stable/c/b1dfaa6f7a957726a6800135be3659fbe4bbf2a4
- https://git.kernel.org/stable/c/bd232801ef1d1fd985d2d4ca3cd1d888303ca86f
- https://git.kernel.org/stable/c/c8cc238093ca6c99267032f6cfe78f59389f3157
- https://git.kernel.org/stable/c/edbbe88f83b524434974e84808d3093199d67c24
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63937.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-63937
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced9b54e248d2644be71cb394eb85f31ad99e023a05Fixedbd232801ef1d1fd985d2d4ca3cd1d888303ca86fFixedb1dfaa6f7a957726a6800135be3659fbe4bbf2a4Fixededbbe88f83b524434974e84808d3093199d67c24Fixedc8cc238093ca6c99267032f6cfe78f59389f3157