{"id":"CVE-2026-64304","state":"PUBLISHED","title":"crypto: qat - validate RSA CRT component lengths","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: qat - validate RSA CRT component lengths\n\nThe generic RSA key parser (rsa_helper.c) bounds each CRT component (p,\nq, dp, dq, qinv) by the modulus size n_sz, but qat_rsa_setkey_crt()\nallocates half-size DMA buffers (key_sz / 2) and right-aligns each\ncomponent with:\n\n    memcpy(dst + half_key_sz - len, src, len)\n\nWhen a CRT component is larger than half_key_sz the subtraction\nunderflows and memcpy writes past the DMA buffer, causing memory\ncorruption.\n\nAdd a len > half_key_sz check next to the existing !len check for each\nof the five CRT components so the driver falls back to the non-CRT path\ninstead of writing out of bounds.","publishedAt":"2026-07-25T08:49:38.873Z","updatedAt":"2026-10-19T20:38:22.981Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"879f77e9071f029e1c9bd5a75814ecf51370f846","status":"affected","lessThan":"6d99c5fadd2df488103f64d6475b63ba6852202b","versionType":"git"},{"version":"879f77e9071f029e1c9bd5a75814ecf51370f846","status":"affected","lessThan":"c34369473bfe92a0b46ec78d6358e30341c7f481","versionType":"git"},{"version":"879f77e9071f029e1c9bd5a75814ecf51370f846","status":"affected","lessThan":"1002719d13072a5e4be1e993aa61dffb4a604e82","versionType":"git"},{"version":"879f77e9071f029e1c9bd5a75814ecf51370f846","status":"affected","lessThan":"500319830d76911c120dc0b9605f8c16d7702844","versionType":"git"},{"version":"879f77e9071f029e1c9bd5a75814ecf51370f846","status":"affected","lessThan":"3d61a214fdcda41f1ebfabbb483404032a7b4d91","versionType":"git"},{"version":"879f77e9071f029e1c9bd5a75814ecf51370f846","status":"affected","lessThan":"6fb62b767f3e27661e8f8d2f7b85f4e098fcdb1a","versionType":"git"},{"version":"879f77e9071f029e1c9bd5a75814ecf51370f846","status":"affected","lessThan":"ce42224487c504aee4b7ff3a7342e7b4d7e28cc9","versionType":"git"},{"version":"879f77e9071f029e1c9bd5a75814ecf51370f846","status":"affected","lessThan":"b3ac78756588059729b9195fcc9f4b37d54057a5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/crypto/intel/qat/qat_common/qat_asym_algs.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.8","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/crypto/intel/qat/qat_common/qat_asym_algs.c"]}],"references":["https://git.kernel.org/stable/c/6d99c5fadd2df488103f64d6475b63ba6852202b","https://git.kernel.org/stable/c/c34369473bfe92a0b46ec78d6358e30341c7f481","https://git.kernel.org/stable/c/1002719d13072a5e4be1e993aa61dffb4a604e82","https://git.kernel.org/stable/c/500319830d76911c120dc0b9605f8c16d7702844","https://git.kernel.org/stable/c/3d61a214fdcda41f1ebfabbb483404032a7b4d91","https://git.kernel.org/stable/c/6fb62b767f3e27661e8f8d2f7b85f4e098fcdb1a","https://git.kernel.org/stable/c/ce42224487c504aee4b7ff3a7342e7b4d7e28cc9","https://git.kernel.org/stable/c/b3ac78756588059729b9195fcc9f4b37d54057a5"],"weaknesses":["CWE-787"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64304.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64304","state":"PUBLISHED","datePublished":"2026-07-25T08:49:38.873Z","dateUpdated":"2026-10-19T20:38:22.981Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.779Z"},"containers":{"cna":{"title":"crypto: qat - validate RSA CRT component lengths","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: qat - validate RSA CRT component lengths\n\nThe generic RSA key parser (rsa_helper.c) bounds each CRT component (p,\nq, dp, dq, qinv) by the modulus size n_sz, but qat_rsa_setkey_crt()\nallocates half-size DMA buffers (key_sz / 2) and right-aligns each\ncomponent with:\n\n    memcpy(dst + half_key_sz - len, src, len)\n\nWhen a CRT component is larger than half_key_sz the subtraction\nunderflows and memcpy writes past the DMA buffer, causing memory\ncorruption.\n\nAdd a len > half_key_sz check next to the existing !len check for each\nof the five CRT components so the driver falls back to the non-CRT path\ninstead of writing out of bounds."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"879f77e9071f029e1c9bd5a75814ecf51370f846","status":"affected","lessThan":"6d99c5fadd2df488103f64d6475b63ba6852202b","versionType":"git"},{"version":"879f77e9071f029e1c9bd5a75814ecf51370f846","status":"affected","lessThan":"c34369473bfe92a0b46ec78d6358e30341c7f481","versionType":"git"},{"version":"879f77e9071f029e1c9bd5a75814ecf51370f846","status":"affected","lessThan":"1002719d13072a5e4be1e993aa61dffb4a604e82","versionType":"git"},{"version":"879f77e9071f029e1c9bd5a75814ecf51370f846","status":"affected","lessThan":"500319830d76911c120dc0b9605f8c16d7702844","versionType":"git"},{"version":"879f77e9071f029e1c9bd5a75814ecf51370f846","status":"affected","lessThan":"3d61a214fdcda41f1ebfabbb483404032a7b4d91","versionType":"git"},{"version":"879f77e9071f029e1c9bd5a75814ecf51370f846","status":"affected","lessThan":"6fb62b767f3e27661e8f8d2f7b85f4e098fcdb1a","versionType":"git"},{"version":"879f77e9071f029e1c9bd5a75814ecf51370f846","status":"affected","lessThan":"ce42224487c504aee4b7ff3a7342e7b4d7e28cc9","versionType":"git"},{"version":"879f77e9071f029e1c9bd5a75814ecf51370f846","status":"affected","lessThan":"b3ac78756588059729b9195fcc9f4b37d54057a5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/crypto/intel/qat/qat_common/qat_asym_algs.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.8","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/crypto/intel/qat/qat_common/qat_asym_algs.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/6d99c5fadd2df488103f64d6475b63ba6852202b"},{"url":"https://git.kernel.org/stable/c/c34369473bfe92a0b46ec78d6358e30341c7f481"},{"url":"https://git.kernel.org/stable/c/1002719d13072a5e4be1e993aa61dffb4a604e82"},{"url":"https://git.kernel.org/stable/c/500319830d76911c120dc0b9605f8c16d7702844"},{"url":"https://git.kernel.org/stable/c/3d61a214fdcda41f1ebfabbb483404032a7b4d91"},{"url":"https://git.kernel.org/stable/c/6fb62b767f3e27661e8f8d2f7b85f4e098fcdb1a"},{"url":"https://git.kernel.org/stable/c/ce42224487c504aee4b7ff3a7342e7b4d7e28cc9"},{"url":"https://git.kernel.org/stable/c/b3ac78756588059729b9195fcc9f4b37d54057a5"}],"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 - An unprivileged local process can add a crafted PKCS#8 RSA private key to its own keyring and invoke KEYCTL_PKEY_QUERY, which selects qat-rsa and reaches the vulnerable key setup path.\nAC:L - With an active QAT asymmetric service and PKCS#8 parser, an oversized CRT integer deterministically causes unsigned offset underflow and an out-of-bounds memcpy. No race or attacker-uncontrollable condition is required.\nPR:L - An ordinary user can create, search, and use keys in a personal process, thread, or session keyring. No capability, administrator privilege, or user namespace is required.\nUI:N - The attacker directly performs the add_key and keyctl system calls without any victim action.\nS:U - The vulnerable QAT driver and the corrupted kernel resources share the same security authority. Ordinary kernel privilege escalation does not cross a CVSS scope boundary.\nC:H - The controlled kernel-memory overwrite can corrupt page tables, credentials, or control-flow objects and plausibly yield code execution with access to protected kernel memory.\nI:H - Attacker-controlled CRT bytes are written outside the coherent DMA allocation, potentially through multiple CRT components. This can provide powerful kernel-memory corruption and control-flow hijacking primitives.\nA:H - The invalid destination can cause an immediate kernel fault or corrupt unrelated kernel memory and subsequently panic or hang the system. The attack is repeatable."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:53:03.298Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.12.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-64304","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:38:47.574944Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","lang":"en","type":"CWE","description":"CWE-787 Out-of-bounds Write"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T20:38:22.981Z"}}]}}}