arm64/fpsimd: Avoid clobbering kernel FPSIMD state with SMSTOP
In the Linux kernel, the following vulnerability has been resolved: arm64/fpsimd: Avoid clobbering kernel FPSIMD state with SMSTOP On system with SME, a thread's kernel FPSIMD state may be erroneously clobbered during a context switch immediately after that state is restored. Systems without SME are unaffected. If the CPU happens to be in streaming SVE mode before a context switch to a thread with kernel FPSIMD state, fpsimd_thread_switch() will restore the kernel FPSIMD state using fpsimd_load_kernel_state() while the CPU is still in streaming SVE mode. When fpsimd_thread_switch() subsequently calls fpsimd_flush_cpu_state(), this will execute an SMSTOP, causing an exit from streaming SVE mode. The exit from streaming SVE mode will cause the hardware to reset a number of FPSIMD/SVE/SME registers, clobbering the FPSIMD state. Fix this by calling fpsimd_flush_cpu_state() before restoring the kernel FPSIMD state.
CVE-2025-38169
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-38169
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "e92bee9f861b466c676f0200be3e46af7bc4ac6b",
"lessThan": "55d52af498daea75aa03ba9b7e444c8ae495ac20",
"versionType": "git"
},
{
"status": "affected",
"version": "e92bee9f861b466c676f0200be3e46af7bc4ac6b",
"lessThan": "a305821f597ec943849d3e53924adb88c61ed682",
"versionType": "git"
},
{
"status": "affected",
"version": "e92bee9f861b466c676f0200be3e46af7bc4ac6b",
"lessThan": "01098d893fa8a6edb2b56e178b798e3e6b674f02",
"versionType": "git"
},
{
"status": "affected",
"version": "e003c485ac82a9f8de4204912ed059ac6dd4257c",
"versionType": "git"
},
{
"status": "affected",
"version": "25b90cd122d546823da90b916f7c3289dfe83a99",
"versionType": "git"
},
{
"status": "affected",
"version": "6.8.12",
"lessThan": "6.9",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.9.3",
"lessThan": "6.10",
"versionType": "semver"
}
],
"programFiles": [
"arch/arm64/kernel/fpsimd.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.10"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.10",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.34",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.15.3",
"versionType": "semver",
"lessThanOrEqual": "6.15.*"
},
{
"status": "unaffected",
"version": "6.16",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/arm64/kernel/fpsimd.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-38169
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30535 · Revision 1
- Added to Heist Feed
- Publisher date