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.
Vendor | Product | Version | CPE |
---|---|---|---|
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"arch/x86/kernel/fpu/xstate.c",
"arch/x86/kernel/fpu/xstate.h"
],
"versions": [
{
"version": "672365477ae8",
"lessThan": "21c7c00dae55",
"status": "affected",
"versionType": "git"
},
{
"version": "672365477ae8",
"lessThan": "1acbca933313",
"status": "affected",
"versionType": "git"
},
{
"version": "672365477ae8",
"lessThan": "92b0f04e9376",
"status": "affected",
"versionType": "git"
},
{
"version": "672365477ae8",
"lessThan": "b61e3b7055ac",
"status": "affected",
"versionType": "git"
},
{
"version": "672365477ae8",
"lessThan": "10e4b5166df9",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"arch/x86/kernel/fpu/xstate.c",
"arch/x86/kernel/fpu/xstate.h"
],
"versions": [
{
"version": "5.16",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.16",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.1.84",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.6.24",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.7.12",
"lessThanOrEqual": "6.7.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.8.3",
"lessThanOrEqual": "6.8.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.9",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/10e4b5166df9ff7a2d5316138ca668b42d004422
git.kernel.org/stable/c/1acbca933313aa866e39996904c9aca4d435c4cd
git.kernel.org/stable/c/21c7c00dae55cb0e3810d5f9506b58f68475d41d
git.kernel.org/stable/c/92b0f04e937665bde5768f3fcc622dcce44413d8
git.kernel.org/stable/c/b61e3b7055ac6edee4be071c52f48c26472d2624