high8.8
CVE-2026-63937
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…
Impact
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 READ_ONCE()/WRITE_ONCE() 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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Linux | Linux Kernel | from 6.11 before 6.12.93 from 6.13 before 6.18.35 from 6.19 before 7.0.12 Version 7.1 |
Weakness classification
References
- NVD record
- CVE.org record
- 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