{"id":"CVE-2026-90336","state":"PUBLISHED","title":"serial: core: clear freed pointers on uart_register_driver() failure","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nserial: core: clear freed pointers on uart_register_driver() failure\n\nuart_register_driver() leaves drv->state pointing to freed memory when\ntty_alloc_driver() fails. If tty_register_driver() fails, drv->tty_driver\nalso retains a pointer after its reference is dropped.\n\nDrivers that use drv->state as an \"already registered\" flag can then skip\nregistration on the next probe and pass the freed state to\nuart_add_one_port().\n\nThis issue was found with failslab on QEMU's raspi1ap board by\nfailing registration and binding the PL011 port again.\n\nClear both pointers on their failure paths, as uart_unregister_driver()\nalready does.","publishedAt":"2026-09-17T16:08:49.016Z","updatedAt":"2026-10-30T12:35:14.252Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"5e260edd28eddc3b92c9f578df3026fd11c710cf","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"a9c0ffe5930c97b352f32febfc59a6e6ae6772ee","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"802e2192a9d38027730c2869c67c9131b8c8fe9f","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"ddf51d74ee9f9857c99477329d80408cedebda61","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"06b376432974fe5f25f2843a8e8438c6a1cf3d50","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"61a2fb25551be0375bc16ef2a70c987dfca26183","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/serial/serial_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","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/tty/serial/serial_core.c"]}],"references":["https://git.kernel.org/stable/c/5e260edd28eddc3b92c9f578df3026fd11c710cf","https://git.kernel.org/stable/c/a9c0ffe5930c97b352f32febfc59a6e6ae6772ee","https://git.kernel.org/stable/c/802e2192a9d38027730c2869c67c9131b8c8fe9f","https://git.kernel.org/stable/c/ddf51d74ee9f9857c99477329d80408cedebda61","https://git.kernel.org/stable/c/06b376432974fe5f25f2843a8e8438c6a1cf3d50","https://git.kernel.org/stable/c/61a2fb25551be0375bc16ef2a70c987dfca26183"],"weaknesses":[],"ingestedAt":"2026-10-30T12:54:04.478Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90336.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90336","state":"PUBLISHED","datePublished":"2026-09-17T16:08:49.016Z","dateUpdated":"2026-10-30T12:35:14.252Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.803Z"},"containers":{"cna":{"title":"serial: core: clear freed pointers on uart_register_driver() failure","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nserial: core: clear freed pointers on uart_register_driver() failure\n\nuart_register_driver() leaves drv->state pointing to freed memory when\ntty_alloc_driver() fails. If tty_register_driver() fails, drv->tty_driver\nalso retains a pointer after its reference is dropped.\n\nDrivers that use drv->state as an \"already registered\" flag can then skip\nregistration on the next probe and pass the freed state to\nuart_add_one_port().\n\nThis issue was found with failslab on QEMU's raspi1ap board by\nfailing registration and binding the PL011 port again.\n\nClear both pointers on their failure paths, as uart_unregister_driver()\nalready does."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"5e260edd28eddc3b92c9f578df3026fd11c710cf","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"a9c0ffe5930c97b352f32febfc59a6e6ae6772ee","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"802e2192a9d38027730c2869c67c9131b8c8fe9f","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"ddf51d74ee9f9857c99477329d80408cedebda61","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"06b376432974fe5f25f2843a8e8438c6a1cf3d50","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","status":"affected","lessThan":"61a2fb25551be0375bc16ef2a70c987dfca26183","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/serial/serial_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.12","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","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/tty/serial/serial_core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/5e260edd28eddc3b92c9f578df3026fd11c710cf"},{"url":"https://git.kernel.org/stable/c/a9c0ffe5930c97b352f32febfc59a6e6ae6772ee"},{"url":"https://git.kernel.org/stable/c/802e2192a9d38027730c2869c67c9131b8c8fe9f"},{"url":"https://git.kernel.org/stable/c/ddf51d74ee9f9857c99477329d80408cedebda61"},{"url":"https://git.kernel.org/stable/c/06b376432974fe5f25f2843a8e8438c6a1cf3d50"},{"url":"https://git.kernel.org/stable/c/61a2fb25551be0375bc16ef2a70c987dfca26183"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:35:14.252Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}