{"id":"CVE-2026-93086","state":"PUBLISHED","title":"firmware: arm_scmi: Avoid IDR updates while cleaning channels","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_scmi: Avoid IDR updates while cleaning channels\n\nscmi_cleanup_channels() walks the TX/RX channel IDRs with\nidr_for_each() to free transport resources and destroy the dedicated\ntransport devices before calling idr_destroy().\n\nThe destroy callback removed each entry from the same IDR being walked.\nThat is not needed for this cleanup path, and it is unsafe because\nidr_for_each() has not advanced its radix-tree iterator while the\ncallback is running. Removing the current entry from the callback can\ninvalidate the iterator state. The callback also cannot be protected by\nrcu_read_lock(), because scmi_device_destroy() may sleep.\n\nLeave IDR teardown to the following idr_destroy() call and keep the\ncallback limited to device destruction.","publishedAt":"2026-09-17T16:11:05.025Z","updatedAt":"2026-10-30T12:35:52.863Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"22f7f35fd71b597a5d916e41d7646be6ee530c86","status":"affected","lessThan":"f50698c617350a6e2064dffd6cff3f391e142f55","versionType":"git"},{"version":"05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1","status":"affected","lessThan":"aed24a3c63920539e9de7fbfe7929a2e7c888cd2","versionType":"git"},{"version":"05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1","status":"affected","lessThan":"431c6b872ba7fedcc5a3afb0ec3517db4d95d088","versionType":"git"},{"version":"05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1","status":"affected","lessThan":"54e5a4f7d83db4552d963d0785be32d9df680dcd","versionType":"git"},{"version":"05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1","status":"affected","lessThan":"bab26acebe55e8ad3ab545abda72faa7ca28c477","versionType":"git"},{"version":"05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1","status":"affected","lessThan":"c38b1e19485aaa820e52cfe162525a8af67563da","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/firmware/arm_scmi/driver.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.3","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/firmware/arm_scmi/driver.c"]}],"references":["https://git.kernel.org/stable/c/f50698c617350a6e2064dffd6cff3f391e142f55","https://git.kernel.org/stable/c/aed24a3c63920539e9de7fbfe7929a2e7c888cd2","https://git.kernel.org/stable/c/431c6b872ba7fedcc5a3afb0ec3517db4d95d088","https://git.kernel.org/stable/c/54e5a4f7d83db4552d963d0785be32d9df680dcd","https://git.kernel.org/stable/c/bab26acebe55e8ad3ab545abda72faa7ca28c477","https://git.kernel.org/stable/c/c38b1e19485aaa820e52cfe162525a8af67563da"],"weaknesses":[],"ingestedAt":"2026-10-30T12:54:04.478Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93086.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93086","state":"PUBLISHED","datePublished":"2026-09-17T16:11:05.025Z","dateUpdated":"2026-10-30T12:35:52.863Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-17T15:57:05.662Z"},"containers":{"cna":{"title":"firmware: arm_scmi: Avoid IDR updates while cleaning channels","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_scmi: Avoid IDR updates while cleaning channels\n\nscmi_cleanup_channels() walks the TX/RX channel IDRs with\nidr_for_each() to free transport resources and destroy the dedicated\ntransport devices before calling idr_destroy().\n\nThe destroy callback removed each entry from the same IDR being walked.\nThat is not needed for this cleanup path, and it is unsafe because\nidr_for_each() has not advanced its radix-tree iterator while the\ncallback is running. Removing the current entry from the callback can\ninvalidate the iterator state. The callback also cannot be protected by\nrcu_read_lock(), because scmi_device_destroy() may sleep.\n\nLeave IDR teardown to the following idr_destroy() call and keep the\ncallback limited to device destruction."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"22f7f35fd71b597a5d916e41d7646be6ee530c86","status":"affected","lessThan":"f50698c617350a6e2064dffd6cff3f391e142f55","versionType":"git"},{"version":"05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1","status":"affected","lessThan":"aed24a3c63920539e9de7fbfe7929a2e7c888cd2","versionType":"git"},{"version":"05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1","status":"affected","lessThan":"431c6b872ba7fedcc5a3afb0ec3517db4d95d088","versionType":"git"},{"version":"05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1","status":"affected","lessThan":"54e5a4f7d83db4552d963d0785be32d9df680dcd","versionType":"git"},{"version":"05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1","status":"affected","lessThan":"bab26acebe55e8ad3ab545abda72faa7ca28c477","versionType":"git"},{"version":"05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1","status":"affected","lessThan":"c38b1e19485aaa820e52cfe162525a8af67563da","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/firmware/arm_scmi/driver.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.3","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/firmware/arm_scmi/driver.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f50698c617350a6e2064dffd6cff3f391e142f55"},{"url":"https://git.kernel.org/stable/c/aed24a3c63920539e9de7fbfe7929a2e7c888cd2"},{"url":"https://git.kernel.org/stable/c/431c6b872ba7fedcc5a3afb0ec3517db4d95d088"},{"url":"https://git.kernel.org/stable/c/54e5a4f7d83db4552d963d0785be32d9df680dcd"},{"url":"https://git.kernel.org/stable/c/bab26acebe55e8ad3ab545abda72faa7ca28c477"},{"url":"https://git.kernel.org/stable/c/c38b1e19485aaa820e52cfe162525a8af67563da"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:35:52.863Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}