{"id":"CVE-2025-40193","state":"PUBLISHED","title":"xtensa: simdisk: add input size check in proc_write_simdisk","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxtensa: simdisk: add input size check in proc_write_simdisk\n\nA malicious user could pass an arbitrarily bad value\nto memdup_user_nul(), potentially causing kernel crash.\n\nThis follows the same pattern as commit ee76746387f6\n(\"netdevsim: prevent bad user input in nsim_dev_health_break_write()\")","publishedAt":"2025-11-12T21:56:31.751Z","updatedAt":"2026-05-11T21:44:33.601Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b6c7e873daf765e41233b9752083b66442703b7a","status":"affected","lessThan":"f40405ccfb87b71175f2d5d004c0b8a0aebcc2cf","versionType":"git"},{"version":"b6c7e873daf765e41233b9752083b66442703b7a","status":"affected","lessThan":"151bd88859474cdaccc1e4c8b21fbf72dbba2ab4","versionType":"git"},{"version":"b6c7e873daf765e41233b9752083b66442703b7a","status":"affected","lessThan":"d381de7fd4cdc928ede96987dc64b133e6480dd6","versionType":"git"},{"version":"b6c7e873daf765e41233b9752083b66442703b7a","status":"affected","lessThan":"a0c2c36d864ef3676b05cfd8c58b72ee3214cb1a","versionType":"git"},{"version":"b6c7e873daf765e41233b9752083b66442703b7a","status":"affected","lessThan":"5d5f08fd0cd970184376bee07d59f635c8403f63","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/xtensa/platforms/iss/simdisk.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.9","versionType":"semver"},{"version":"6.1.157","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.113","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.54","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.4","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/xtensa/platforms/iss/simdisk.c"]}],"references":["https://git.kernel.org/stable/c/f40405ccfb87b71175f2d5d004c0b8a0aebcc2cf","https://git.kernel.org/stable/c/151bd88859474cdaccc1e4c8b21fbf72dbba2ab4","https://git.kernel.org/stable/c/d381de7fd4cdc928ede96987dc64b133e6480dd6","https://git.kernel.org/stable/c/a0c2c36d864ef3676b05cfd8c58b72ee3214cb1a","https://git.kernel.org/stable/c/5d5f08fd0cd970184376bee07d59f635c8403f63"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/40xxx/CVE-2025-40193.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40193","state":"PUBLISHED","datePublished":"2025-11-12T21:56:31.751Z","dateUpdated":"2026-05-11T21:44:33.601Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T07:20:57.178Z"},"containers":{"cna":{"title":"xtensa: simdisk: add input size check in proc_write_simdisk","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nxtensa: simdisk: add input size check in proc_write_simdisk\n\nA malicious user could pass an arbitrarily bad value\nto memdup_user_nul(), potentially causing kernel crash.\n\nThis follows the same pattern as commit ee76746387f6\n(\"netdevsim: prevent bad user input in nsim_dev_health_break_write()\")"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b6c7e873daf765e41233b9752083b66442703b7a","status":"affected","lessThan":"f40405ccfb87b71175f2d5d004c0b8a0aebcc2cf","versionType":"git"},{"version":"b6c7e873daf765e41233b9752083b66442703b7a","status":"affected","lessThan":"151bd88859474cdaccc1e4c8b21fbf72dbba2ab4","versionType":"git"},{"version":"b6c7e873daf765e41233b9752083b66442703b7a","status":"affected","lessThan":"d381de7fd4cdc928ede96987dc64b133e6480dd6","versionType":"git"},{"version":"b6c7e873daf765e41233b9752083b66442703b7a","status":"affected","lessThan":"a0c2c36d864ef3676b05cfd8c58b72ee3214cb1a","versionType":"git"},{"version":"b6c7e873daf765e41233b9752083b66442703b7a","status":"affected","lessThan":"5d5f08fd0cd970184376bee07d59f635c8403f63","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/xtensa/platforms/iss/simdisk.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.9","versionType":"semver"},{"version":"6.1.157","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.113","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.54","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.4","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/xtensa/platforms/iss/simdisk.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f40405ccfb87b71175f2d5d004c0b8a0aebcc2cf"},{"url":"https://git.kernel.org/stable/c/151bd88859474cdaccc1e4c8b21fbf72dbba2ab4"},{"url":"https://git.kernel.org/stable/c/d381de7fd4cdc928ede96987dc64b133e6480dd6"},{"url":"https://git.kernel.org/stable/c/a0c2c36d864ef3676b05cfd8c58b72ee3214cb1a"},{"url":"https://git.kernel.org/stable/c/5d5f08fd0cd970184376bee07d59f635c8403f63"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:44:33.601Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.1.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.6.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.12.54"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.17.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.9","versionEndExcluding":"6.18"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}