{"api_version":"1","generated_at":"2026-09-17T23:51:45+00:00","cve":"CVE-2026-93050","urls":{"html":"https://cve.report/CVE-2026-93050","api":"https://cve.report/api/cve/CVE-2026-93050.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-93050","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-93050"},"summary":{"title":"ipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove\n\nThree issues arise when the device is removed while a tty session is\nstill active:\n\n1. UAF of struct ipoctal: the remove callback frees ipoctal via\n   kfree() while tty ops may still access it.  Fix by introducing\n   kref-based lifetime management — kref is taken in install() when\n   a tty is opened and released in cleanup() when the tty is finally\n   destroyed; remove() uses kref_put() instead of kfree().\n\n2. NULL dereference in ipoctal_write_tty(): __ipoctal_remove()\n   frees xmit_buf via tty_port_free_xmit_buf() while a userspace\n   process may still hold the tty fd and call write().  Fix by\n   checking for NULL xmit_buf in ipoctal_write_tty().\n\n3. UAF in ipoctal_cleanup(): ipack_put_carrier(ipoctal->dev)\n   dereferences ipoctal->dev after the ipack_device has been freed\n   by ipack_device_del().  Fix by caching ipoctal->carrier_owner\n   during probe() and calling module_put() on the cached pointer\n   directly in cleanup(), avoiding any access to ipoctal->dev.\n\nAlso introduce a \"removed\" flag in struct ipoctal, set at the start\nof __ipoctal_remove(), and checked in every tty op that accesses\nhardware resources (port_activate, write_tty, set_termios, hangup,\nshutdown).  This prevents page faults when devm_ioremap() regions\nare unmapped after remove() returns.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:17:58","updated_at":"2026-09-17 17:17:58"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/a4613140f01bd0fb9980e2746ed9aaa65a29b5d6","name":"https://git.kernel.org/stable/c/a4613140f01bd0fb9980e2746ed9aaa65a29b5d6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a","name":"https://git.kernel.org/stable/c/ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1a3258e105f711538201bdd2ac2a05b11554eabc","name":"https://git.kernel.org/stable/c/1a3258e105f711538201bdd2ac2a05b11554eabc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4a6518be316029650301f2a5e8f0def229b895d9","name":"https://git.kernel.org/stable/c/4a6518be316029650301f2a5e8f0def229b895d9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c92ef8fd834521f0b788e0511976c689fe57c63c","name":"https://git.kernel.org/stable/c/c92ef8fd834521f0b788e0511976c689fe57c63c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b6b5d64cb161a28347d64dc3168a636c4abb68d5","name":"https://git.kernel.org/stable/c/b6b5d64cb161a28347d64dc3168a636c4abb68d5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93050","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93050","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 05e5027efc9c0bb6d1d04cde279afbafca0a7929 ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 05e5027efc9c0bb6d1d04cde279afbafca0a7929 c92ef8fd834521f0b788e0511976c689fe57c63c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 05e5027efc9c0bb6d1d04cde279afbafca0a7929 a4613140f01bd0fb9980e2746ed9aaa65a29b5d6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 05e5027efc9c0bb6d1d04cde279afbafca0a7929 1a3258e105f711538201bdd2ac2a05b11554eabc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 05e5027efc9c0bb6d1d04cde279afbafca0a7929 4a6518be316029650301f2a5e8f0def229b895d9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 05e5027efc9c0bb6d1d04cde279afbafca0a7929 b6b5d64cb161a28347d64dc3168a636c4abb68d5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.8","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.8 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.188 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.52 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.6 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/ipack/devices/ipoctal.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a","status":"affected","version":"05e5027efc9c0bb6d1d04cde279afbafca0a7929","versionType":"git"},{"lessThan":"c92ef8fd834521f0b788e0511976c689fe57c63c","status":"affected","version":"05e5027efc9c0bb6d1d04cde279afbafca0a7929","versionType":"git"},{"lessThan":"a4613140f01bd0fb9980e2746ed9aaa65a29b5d6","status":"affected","version":"05e5027efc9c0bb6d1d04cde279afbafca0a7929","versionType":"git"},{"lessThan":"1a3258e105f711538201bdd2ac2a05b11554eabc","status":"affected","version":"05e5027efc9c0bb6d1d04cde279afbafca0a7929","versionType":"git"},{"lessThan":"4a6518be316029650301f2a5e8f0def229b895d9","status":"affected","version":"05e5027efc9c0bb6d1d04cde279afbafca0a7929","versionType":"git"},{"lessThan":"b6b5d64cb161a28347d64dc3168a636c4abb68d5","status":"affected","version":"05e5027efc9c0bb6d1d04cde279afbafca0a7929","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/ipack/devices/ipoctal.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.8"},{"lessThan":"3.8","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.188","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.157","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.52","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.188","versionStartIncluding":"3.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"3.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"3.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"3.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"3.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"3.8","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove\n\nThree issues arise when the device is removed while a tty session is\nstill active:\n\n1. UAF of struct ipoctal: the remove callback frees ipoctal via\n   kfree() while tty ops may still access it.  Fix by introducing\n   kref-based lifetime management — kref is taken in install() when\n   a tty is opened and released in cleanup() when the tty is finally\n   destroyed; remove() uses kref_put() instead of kfree().\n\n2. NULL dereference in ipoctal_write_tty(): __ipoctal_remove()\n   frees xmit_buf via tty_port_free_xmit_buf() while a userspace\n   process may still hold the tty fd and call write().  Fix by\n   checking for NULL xmit_buf in ipoctal_write_tty().\n\n3. UAF in ipoctal_cleanup(): ipack_put_carrier(ipoctal->dev)\n   dereferences ipoctal->dev after the ipack_device has been freed\n   by ipack_device_del().  Fix by caching ipoctal->carrier_owner\n   during probe() and calling module_put() on the cached pointer\n   directly in cleanup(), avoiding any access to ipoctal->dev.\n\nAlso introduce a \"removed\" flag in struct ipoctal, set at the start\nof __ipoctal_remove(), and checked in every tty op that accesses\nhardware resources (port_activate, write_tty, set_termios, hangup,\nshutdown).  This prevents page faults when devm_ioremap() regions\nare unmapped after remove() returns."}],"providerMetadata":{"dateUpdated":"2026-09-17T16:10:40.360Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/ab5f5b27a340004b92252c6a5f23bf1c6cf3b02a"},{"url":"https://git.kernel.org/stable/c/c92ef8fd834521f0b788e0511976c689fe57c63c"},{"url":"https://git.kernel.org/stable/c/a4613140f01bd0fb9980e2746ed9aaa65a29b5d6"},{"url":"https://git.kernel.org/stable/c/1a3258e105f711538201bdd2ac2a05b11554eabc"},{"url":"https://git.kernel.org/stable/c/4a6518be316029650301f2a5e8f0def229b895d9"},{"url":"https://git.kernel.org/stable/c/b6b5d64cb161a28347d64dc3168a636c4abb68d5"}],"title":"ipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-93050","datePublished":"2026-09-17T16:10:40.360Z","dateReserved":"2026-09-17T15:57:05.658Z","dateUpdated":"2026-09-17T16:10:40.360Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:17:58","lastModifiedDate":"2026-09-17 17:17:58","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"93050","Ordinal":"1","Title":"ipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in c","CVE":"CVE-2026-93050","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"93050","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in cleanup on remove\n\nThree issues arise when the device is removed while a tty session is\nstill active:\n\n1. UAF of struct ipoctal: the remove callback frees ipoctal via\n   kfree() while tty ops may still access it.  Fix by introducing\n   kref-based lifetime management — kref is taken in install() when\n   a tty is opened and released in cleanup() when the tty is finally\n   destroyed; remove() uses kref_put() instead of kfree().\n\n2. NULL dereference in ipoctal_write_tty(): __ipoctal_remove()\n   frees xmit_buf via tty_port_free_xmit_buf() while a userspace\n   process may still hold the tty fd and call write().  Fix by\n   checking for NULL xmit_buf in ipoctal_write_tty().\n\n3. UAF in ipoctal_cleanup(): ipack_put_carrier(ipoctal->dev)\n   dereferences ipoctal->dev after the ipack_device has been freed\n   by ipack_device_del().  Fix by caching ipoctal->carrier_owner\n   during probe() and calling module_put() on the cached pointer\n   directly in cleanup(), avoiding any access to ipoctal->dev.\n\nAlso introduce a \"removed\" flag in struct ipoctal, set at the start\nof __ipoctal_remove(), and checked in every tty op that accesses\nhardware resources (port_activate, write_tty, set_termios, hangup,\nshutdown).  This prevents page faults when devm_ioremap() regions\nare unmapped after remove() returns.","Type":"Description","Title":"ipack: ipoctal: fix UAF, null-ptr-deref, and use-after-free in c"}]}}}