138 lines
7.7 KiB
JSON
138 lines
7.7 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-39804",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T07:20:57.135Z",
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"datePublished": "2025-09-15T12:36:46.483Z",
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"dateUpdated": "2026-08-05T12:05:18.397Z"
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},
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:05:18.397Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib/crypto: arm64/poly1305: Fix register corruption in no-SIMD contexts\n\nRestore the SIMD usability check that was removed by commit a59e5468a921\n(\"crypto: arm64/poly1305 - Add block-only interface\").\n\nThis safety check is cheap and is well worth eliminating a footgun.\nWhile the Poly1305 functions should not be called when SIMD registers\nare unusable, if they are anyway, they should just do the right thing\ninstead of corrupting random tasks' registers and/or computing incorrect\nMACs. Fixing this is also needed for poly1305_kunit to pass.\n\nJust use may_use_simd() instead of the original crypto_simd_usable(),\nsince poly1305_kunit won't rely on crypto_simd_disabled_for_test."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - Poly1305 is the MAC half of ChaCha20-Poly1305 and is driven directly by remote peer data in WireGuard, IPsec ESP (rfc7539esp) and kTLS on arm64 routers, phones and cloud servers, so an off-path attacker's packets are what cause the vulnerable `poly1305_blocks_arch()` invocation.\nAC:L - There is no race to win and no memory layout to groom; once the MAC computation runs in a context where SIMD is unusable the `BUG_ON(!may_use_simd())` in `kernel_neon_begin()` fires deterministically, and the attacker only has to send traffic that is MAC-verified.\nPR:N - For ChaCha20-Poly1305 AEAD the Poly1305 tag computation is itself the authentication step, so it processes an unauthenticated peer's packet before any credential is validated; no account or key on the target is needed.\nUI:N - Packet reception and the resulting AEAD tag verification happen automatically in the kernel with no action by any local user.\nS:U - The fault and its consequences are entirely within the kernel's own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:N - On arm64 the `BUG_ON` in `kernel_neon_begin()` traps before any NEON instruction executes, so the FPSIMD-register leak that the check guards against cannot be reached in the `have_neon` configuration and no memory is disclosed.\nI:N - The trap gives the attacker no write primitive, and a Poly1305 tag computed from a disturbed state fails closed on verification rather than allowing forged data to be accepted.\nA:H - Hitting `BUG_ON(!may_use_simd())` raises a kernel BUG from interrupt context, producing a fatal exception in interrupt / panic that takes down the whole system, and it can be re-triggered by simply resending traffic."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"lib/crypto/arm64/poly1305-glue.c"
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],
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"versions": [
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{
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"version": "a59e5468a921937cb7317892779c67046ad9f5cc",
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"lessThan": "ef74efa598b7bbc5c24509f7f56af2806f81c339",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a59e5468a921937cb7317892779c67046ad9f5cc",
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"lessThan": "eec76ea5a7213c48529a46eed1b343e5cee3aaab",
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"status": "affected",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"lib/crypto/arm64/poly1305-glue.c"
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],
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"versions": [
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{
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"version": "6.16",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.16",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.16.4",
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"lessThanOrEqual": "6.16.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.17",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "6.16.4"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/ef74efa598b7bbc5c24509f7f56af2806f81c339"
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},
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{
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"url": "https://git.kernel.org/stable/c/eec76ea5a7213c48529a46eed1b343e5cee3aaab"
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}
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],
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"title": "lib/crypto: arm64/poly1305: Fix register corruption in no-SIMD contexts",
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"x_generator": {
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