{"id":"CVE-2026-99008","state":"PUBLISHED","title":"Bluetooth: RFCOMM: Fix NULL tty_dev dereference in rfcomm_dev_shutdown","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: Fix NULL tty_dev dereference in rfcomm_dev_shutdown\n\nsyzbot hit a NULL pointer dereference in rfcomm_dev_shutdown() when an\nRFCOMM tty is closed.\n\nrfcomm_dev_add() puts the new device on rfcomm_dev_list first and only\nthen registers the tty device and saves it in dev->tty_dev. If that\nregistration fails, dev->tty_dev is never set at all. The device can be\nlooked up in the meantime, so an open() of /dev/rfcommN gets through\nrfcomm_tty_install() and attaches to it. When that tty is closed again,\nrfcomm_dev_shutdown() uses dev->tty_dev without checking it:\n\n  Oops: general protection fault, probably for non-canonical address\n  KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]\n  RIP: 0010:rfcomm_dev_shutdown+0x48/0xb0 net/bluetooth/rfcomm/tty.c:131\n  Call Trace:\n   tty_port_shutdown+0x1bf/0x220 drivers/tty/tty_port.c:372\n   tty_port_close+0x4e/0x150 drivers/tty/tty_port.c:705\n   tty_release+0x359/0x1670 drivers/tty/tty_io.c:1718\n   __fput+0x418/0xa50 fs/file_table.c:512\n\nrfcomm_dev_destruct() already copes with a NULL dev->tty_dev. Add the\nsame check to rfcomm_dev_shutdown(), so the tty device is only moved\nwhen it was actually registered.","publishedAt":"2026-10-23T12:20:33.355Z","updatedAt":"2026-10-30T12:40:53.373Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cad348a17e170451ea8688b532a6ca3e98c63b60","status":"affected","lessThan":"b2b915042be073637d9f93dc51ef15fc0685ae8a","versionType":"git"},{"version":"cad348a17e170451ea8688b532a6ca3e98c63b60","status":"affected","lessThan":"a43452d8c1015ac2f0e43ff946be5425427b02cc","versionType":"git"},{"version":"cad348a17e170451ea8688b532a6ca3e98c63b60","status":"affected","lessThan":"3f6394f6c6d1b6817065d3b402f55d437063a704","versionType":"git"},{"version":"cad348a17e170451ea8688b532a6ca3e98c63b60","status":"affected","lessThan":"d5c372ad03330f02962d4860df4d355ab25487df","versionType":"git"},{"version":"cad348a17e170451ea8688b532a6ca3e98c63b60","status":"affected","lessThan":"3fd5164bdb04635caa7942ddb554b0ec699a9433","versionType":"git"},{"version":"cad348a17e170451ea8688b532a6ca3e98c63b60","status":"affected","lessThan":"a661f401f83b8462f2d424e0a1a72b7681e92ea2","versionType":"git"},{"version":"cad348a17e170451ea8688b532a6ca3e98c63b60","status":"affected","lessThan":"d0aef0b0374678153244f162df507106d728af39","versionType":"git"},{"version":"cad348a17e170451ea8688b532a6ca3e98c63b60","status":"affected","lessThan":"08e90633377f1b2567ab5ad6810b74c552246a07","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/rfcomm/tty.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.12","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","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":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.11","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":["net/bluetooth/rfcomm/tty.c"]}],"references":["https://git.kernel.org/stable/c/b2b915042be073637d9f93dc51ef15fc0685ae8a","https://git.kernel.org/stable/c/a43452d8c1015ac2f0e43ff946be5425427b02cc","https://git.kernel.org/stable/c/3f6394f6c6d1b6817065d3b402f55d437063a704","https://git.kernel.org/stable/c/d5c372ad03330f02962d4860df4d355ab25487df","https://git.kernel.org/stable/c/3fd5164bdb04635caa7942ddb554b0ec699a9433","https://git.kernel.org/stable/c/a661f401f83b8462f2d424e0a1a72b7681e92ea2","https://git.kernel.org/stable/c/d0aef0b0374678153244f162df507106d728af39","https://git.kernel.org/stable/c/08e90633377f1b2567ab5ad6810b74c552246a07"],"weaknesses":[],"ingestedAt":"2026-10-30T13:00:06.648Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/99xxx/CVE-2026-99008.json","commit":"cb14bf1b43b0c9f05f7f40eae2246263fd430780","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99008","state":"PUBLISHED","datePublished":"2026-10-23T12:20:33.355Z","dateUpdated":"2026-10-30T12:40:53.373Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.385Z"},"containers":{"cna":{"title":"Bluetooth: RFCOMM: Fix NULL tty_dev dereference in rfcomm_dev_shutdown","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: Fix NULL tty_dev dereference in rfcomm_dev_shutdown\n\nsyzbot hit a NULL pointer dereference in rfcomm_dev_shutdown() when an\nRFCOMM tty is closed.\n\nrfcomm_dev_add() puts the new device on rfcomm_dev_list first and only\nthen registers the tty device and saves it in dev->tty_dev. If that\nregistration fails, dev->tty_dev is never set at all. The device can be\nlooked up in the meantime, so an open() of /dev/rfcommN gets through\nrfcomm_tty_install() and attaches to it. When that tty is closed again,\nrfcomm_dev_shutdown() uses dev->tty_dev without checking it:\n\n  Oops: general protection fault, probably for non-canonical address\n  KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]\n  RIP: 0010:rfcomm_dev_shutdown+0x48/0xb0 net/bluetooth/rfcomm/tty.c:131\n  Call Trace:\n   tty_port_shutdown+0x1bf/0x220 drivers/tty/tty_port.c:372\n   tty_port_close+0x4e/0x150 drivers/tty/tty_port.c:705\n   tty_release+0x359/0x1670 drivers/tty/tty_io.c:1718\n   __fput+0x418/0xa50 fs/file_table.c:512\n\nrfcomm_dev_destruct() already copes with a NULL dev->tty_dev. Add the\nsame check to rfcomm_dev_shutdown(), so the tty device is only moved\nwhen it was actually registered."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cad348a17e170451ea8688b532a6ca3e98c63b60","status":"affected","lessThan":"b2b915042be073637d9f93dc51ef15fc0685ae8a","versionType":"git"},{"version":"cad348a17e170451ea8688b532a6ca3e98c63b60","status":"affected","lessThan":"a43452d8c1015ac2f0e43ff946be5425427b02cc","versionType":"git"},{"version":"cad348a17e170451ea8688b532a6ca3e98c63b60","status":"affected","lessThan":"3f6394f6c6d1b6817065d3b402f55d437063a704","versionType":"git"},{"version":"cad348a17e170451ea8688b532a6ca3e98c63b60","status":"affected","lessThan":"d5c372ad03330f02962d4860df4d355ab25487df","versionType":"git"},{"version":"cad348a17e170451ea8688b532a6ca3e98c63b60","status":"affected","lessThan":"3fd5164bdb04635caa7942ddb554b0ec699a9433","versionType":"git"},{"version":"cad348a17e170451ea8688b532a6ca3e98c63b60","status":"affected","lessThan":"a661f401f83b8462f2d424e0a1a72b7681e92ea2","versionType":"git"},{"version":"cad348a17e170451ea8688b532a6ca3e98c63b60","status":"affected","lessThan":"d0aef0b0374678153244f162df507106d728af39","versionType":"git"},{"version":"cad348a17e170451ea8688b532a6ca3e98c63b60","status":"affected","lessThan":"08e90633377f1b2567ab5ad6810b74c552246a07","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/rfcomm/tty.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.12","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","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":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.11","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":["net/bluetooth/rfcomm/tty.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/b2b915042be073637d9f93dc51ef15fc0685ae8a"},{"url":"https://git.kernel.org/stable/c/a43452d8c1015ac2f0e43ff946be5425427b02cc"},{"url":"https://git.kernel.org/stable/c/3f6394f6c6d1b6817065d3b402f55d437063a704"},{"url":"https://git.kernel.org/stable/c/d5c372ad03330f02962d4860df4d355ab25487df"},{"url":"https://git.kernel.org/stable/c/3fd5164bdb04635caa7942ddb554b0ec699a9433"},{"url":"https://git.kernel.org/stable/c/a661f401f83b8462f2d424e0a1a72b7681e92ea2"},{"url":"https://git.kernel.org/stable/c/d0aef0b0374678153244f162df507106d728af39"},{"url":"https://git.kernel.org/stable/c/08e90633377f1b2567ab5ad6810b74c552246a07"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:40:53.373Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"7.2.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.12","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}