Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: x86/fpu: Ensure XFD state on signal delivery Sean reported [1] the following splat when running KVM tests: WARNING: CPU: 232 PID: 15391 at xfd_validate_state+0x65/0x70 Call Trace: <TASK> fpu__clear_user_states+0x9c/0x100 arch_do_signal_or_restart+0x142/0x210 exit_to_user_mode_loop+0x55/0x100 do_syscall_64+0x205/0x2c0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 Chao further identified [2] a reproducible scenario involving signal delivery: a non-AMX task is preempted by an AMX-enabled task which modifies the XFD MSR. When the non-AMX task resumes and reloads XSTATE with init values, a warning is triggered due to a mismatch between fpstate::xfd and the CPU's current XFD state. fpu__clear_user_states() does not currently re-synchronize the XFD state after such preemption. Invoke xfd_update_state() which detects and corrects the mismatch if there is a dynamic feature. This also benefits the sigreturn path, as fpu__restore_sig() may call fpu__clear_user_states() when the sigframe is inaccessible. [ dhansen: minor changelog munging ]
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 672365477ae8afca5a1cca98c1deb733235e4525 before eefbfb722042fc9210d2e0ac2b063fd1abf51895; affected 672365477ae8afca5a1cca98c1deb733235e4525 before 1811c610653c0cd21cc9add14595b7cffaeca511; affected 672365477ae8afca5a1cca98c1deb733235e4525 before 5b2619b488f1d08b960c43c6468dd0759e8b3035; affected 672365477ae8afca5a1cca98c1deb733235e4525 before 3f735419c4b43cde42e6d408db39137b82474e31; affected 672365477ae8afca5a1cca98c1deb733235e4525 before 388eff894d6bc5f921e9bfff0e4b0ab2684a96e9 |
| Linux / Linux | affected 5.16; unaffected 0 before 5.16; unaffected 6.1.159 through 6.1.*; unaffected 6.6.117 through 6.6.*; unaffected 6.12.58 through 6.12.*; unaffected 6.17.8 through 6.17.*; unaffected 6.18 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/eefbfb722042fc9210d2e0ac2b063fd1abf51895
- https://git.kernel.org/stable/c/1811c610653c0cd21cc9add14595b7cffaeca511
- https://git.kernel.org/stable/c/5b2619b488f1d08b960c43c6468dd0759e8b3035
- https://git.kernel.org/stable/c/3f735419c4b43cde42e6d408db39137b82474e31
- https://git.kernel.org/stable/c/388eff894d6bc5f921e9bfff0e4b0ab2684a96e9
ADP enrichment
No English description supplied.
No references supplied.