{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38169", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.991Z", "datePublished": "2025-07-03T08:36:08.393Z", "dateUpdated": "2026-08-05T12:00:02.043Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:00:02.043Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64/fpsimd: Avoid clobbering kernel FPSIMD state with SMSTOP\n\nOn system with SME, a thread's kernel FPSIMD state may be erroneously\nclobbered during a context switch immediately after that state is\nrestored. Systems without SME are unaffected.\n\nIf the CPU happens to be in streaming SVE mode before a context switch\nto a thread with kernel FPSIMD state, fpsimd_thread_switch() will\nrestore the kernel FPSIMD state using fpsimd_load_kernel_state() while\nthe CPU is still in streaming SVE mode. When fpsimd_thread_switch()\nsubsequently calls fpsimd_flush_cpu_state(), this will execute an\nSMSTOP, causing an exit from streaming SVE mode. The exit from\nstreaming SVE mode will cause the hardware to reset a number of\nFPSIMD/SVE/SME registers, clobbering the FPSIMD state.\n\nFix this by calling fpsimd_flush_cpu_state() before restoring the kernel\nFPSIMD state." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Triggering requires executing SMSTART/streaming-SVE instructions at EL0 on the affected CPU and generating local scheduler pressure, so the attacker must be able to run code on the target. A remote peer cannot place the CPU into streaming SVE mode.\nAC:L - The attacker controls both sides of the race — they create the streaming-mode task and the kernel-mode NEON workload (AF_ALG, dm-crypt/fscrypt I/O, kTLS), and can pin both to one CPU via sched_setaffinity so ordinary tick preemption reproduces the clobber on demand. No memory layout or victim state outside the attacker's influence is needed, and CONFIG_ARM64_SME is default y.\nPR:L - do_sme_acc() enables SME and streaming mode for any EL0 task with no capability, namespace, or sysctl gate, and driving kernel-mode NEON via AF_ALG or plain I/O on an encrypted/checksummed filesystem needs no privilege. Only unprivileged local code execution is required.\nUI:N - The attacker's own tasks supply both the streaming-mode context and the preempted kernel NEON section; no victim action is needed, and any concurrent crypto/RAID work on the system is silently corrupted.\nS:U - The corruption is confined to kernel FPSIMD register state managed by the same kernel security authority; KVM already flushes and SMSTOPs guest FP state in kvm_arch_vcpu_put_fp(), so no guest/host or IOMMU boundary is crossed.\nC:H - Zeroing V0-V31 mid-operation destroys the in-register AES round-key schedule and IV (aes-ce.S load_round_keys/cbciv) or the ChaCha20 state, so the affected blocks are emitted under a known all-zero key — a fixed, invertible transform. An attacker who observes the resulting dm-crypt/fscrypt blocks or IPsec/kTLS/WireGuard packets recovers the plaintext that encryption was supposed to protect.\nI:H - Kernel crypto, hash, CRC and RAID6 computations silently return wrong results that are written to disk and the wire, corrupting encrypted volumes, RAID parity, filesystem checksums and dm-verity/dm-integrity data. A zeroed GHASH key also yields predictable authentication tags, enabling forgery against integrity-protected data.\nA:H - The silent miscomputation propagates into dm-verity/dm-integrity/filesystem checksum verification failures, producing I/O errors, forced read-only remounts, errors=panic aborts and Android restart-on-corruption reboots, plus unrecoverable RAID6 parity loss. The attacker can trigger it repeatedly and indefinitely." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/arm64/kernel/fpsimd.c" ], "versions": [ { "version": "e92bee9f861b466c676f0200be3e46af7bc4ac6b", "lessThan": "55d52af498daea75aa03ba9b7e444c8ae495ac20", "status": "affected", "versionType": "git" }, { "version": "e92bee9f861b466c676f0200be3e46af7bc4ac6b", "lessThan": "a305821f597ec943849d3e53924adb88c61ed682", "status": "affected", "versionType": "git" }, { "version": "e92bee9f861b466c676f0200be3e46af7bc4ac6b", "lessThan": "01098d893fa8a6edb2b56e178b798e3e6b674f02", "status": "affected", "versionType": "git" }, { "version": "e003c485ac82a9f8de4204912ed059ac6dd4257c", "status": "affected", "versionType": "git" }, { "version": "25b90cd122d546823da90b916f7c3289dfe83a99", "status": "affected", "versionType": "git" }, { "version": "6.8.12", "lessThan": "6.9", "status": "affected", "versionType": "semver" }, { "version": "6.9.3", "lessThan": "6.10", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/arm64/kernel/fpsimd.c" ], "versions": [ { "version": "6.10", "status": "affected" }, { "version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.34", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15.3", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.12.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.15.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/55d52af498daea75aa03ba9b7e444c8ae495ac20" }, { "url": "https://git.kernel.org/stable/c/a305821f597ec943849d3e53924adb88c61ed682" }, { "url": "https://git.kernel.org/stable/c/01098d893fa8a6edb2b56e178b798e3e6b674f02" } ], "title": "arm64/fpsimd: Avoid clobbering kernel FPSIMD state with SMSTOP", "x_generator": { "engine": "bippy-1.2.0" } } } }