{"id":"CVE-2026-90144","state":"PUBLISHED","title":"dpll: fix NULL deref in dpll_device_ops() during teardown race","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndpll: fix NULL deref in dpll_device_ops() during teardown race\n\nWhen the last owner of a dpll device unregisters while a foreign driver\nstill holds a pin on it via dpll_pin_on_pin_register(), the dpll object\nstays alive with an empty registration list. A pin notification queued\nbefore the unregister (e.g. ice reacting to zl3073x_i2c removal) then\nwalks pin->dpll_refs into dpll_device_ops(), which trips the WARN_ON and\ndereferences the missing registration. dpll_lock cannot help because the\nnotification work was queued before the unregistering driver took the\nlock.\n\nTreat the empty registration list as a legitimate transient state. Make\ndpll_priv() and dpll_device_ops() return NULL in that case and make\nevery pin netlink path that resolves a device from a pin skip such\ndplls. dpll_cmd_pin_get_one() picks a ref with a live registration and\nreturns -ENODEV when there is none, the pin dumpit skips such a pin\ninstead of aborting the dump, dpll_msg_add_pin_dplls() and the\nfrequency, esync, reference sync and phase adjust set paths skip dead\nrefs, and dpll_pin_parent_device_set() validates the parent with\ndpll_device_get_by_id(). dpll_pin_register() is the last caller that\ndereferenced the device ops without a check, so move its frequency\nmonitor validation under dpll_lock and tolerate a missing registration\nthere as well.\n\nThe empty registration list is equivalent to a cleared DPLL_REGISTERED\nmark, both transitions happen under dpll_lock in dpll_device_register()\nand dpll_device_unregister(). A pin notification for a pin whose dplls\nare all gone is now dropped with -ENODEV instead of crashing, all\ncallers in the core ignore that return value.\n\n WARNING: drivers/dpll/dpll_core.c:1092 at dpll_device_ops+0x24/0x40,\n CPU#83: kworker/u576:3/23471\n Modules linked in: ... ice ... zl3073x_i2c(-) ... zl3073x ...\n Workqueue: ice_dpll_wq ice_dpll_pin_notify_work [ice]\n RIP: 0010:dpll_device_ops+0x24/0x40\n Call Trace:\n  <TASK>\n  dpll_cmd_pin_get_one+0x336/0x520\n  dpll_pin_event_send+0x82/0x140\n  dpll_pin_on_pin_unregister+0xbb/0x160\n  ice_dpll_pin_notify_work+0x1bc/0x1f0 [ice]\n  process_one_work+0x19e/0x370\n  worker_thread+0x1a6/0x310\n  kthread+0xe4/0x120\n  ret_from_fork+0x1a1/0x270\n  ret_from_fork_asm+0x1a/0x30\n  </TASK>\n ---[ end trace 0000000000000000 ]---\n BUG: kernel NULL pointer dereference, address: 0000000000000010\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page","publishedAt":"2026-09-17T16:06:40.413Z","updatedAt":"2026-10-21T12:50:03.630Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9431063ad323ac864750aeba4d304389bc42ca4e","status":"affected","lessThan":"7d9661d6ef60bee705a3bb220dc59f10d9155c31","versionType":"git"},{"version":"9431063ad323ac864750aeba4d304389bc42ca4e","status":"affected","lessThan":"d39da3ff8d39c31761bf1698bc02a5a206722136","versionType":"git"},{"version":"9431063ad323ac864750aeba4d304389bc42ca4e","status":"affected","lessThan":"fdbf04e3e01a872d0ef2149f846f1a3e3cb54f5b","versionType":"git"},{"version":"9431063ad323ac864750aeba4d304389bc42ca4e","status":"affected","lessThan":"33f016b23a219fe034213849b51436b8e79df251","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dpll/dpll_core.c","drivers/dpll/dpll_netlink.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.7","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/dpll/dpll_core.c","drivers/dpll/dpll_netlink.c"]}],"references":["https://git.kernel.org/stable/c/7d9661d6ef60bee705a3bb220dc59f10d9155c31","https://git.kernel.org/stable/c/d39da3ff8d39c31761bf1698bc02a5a206722136","https://git.kernel.org/stable/c/fdbf04e3e01a872d0ef2149f846f1a3e3cb54f5b","https://git.kernel.org/stable/c/33f016b23a219fe034213849b51436b8e79df251"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90144.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90144","state":"PUBLISHED","datePublished":"2026-09-17T16:06:40.413Z","dateUpdated":"2026-10-21T12:50:03.630Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.789Z"},"containers":{"cna":{"title":"dpll: fix NULL deref in dpll_device_ops() during teardown race","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndpll: fix NULL deref in dpll_device_ops() during teardown race\n\nWhen the last owner of a dpll device unregisters while a foreign driver\nstill holds a pin on it via dpll_pin_on_pin_register(), the dpll object\nstays alive with an empty registration list. A pin notification queued\nbefore the unregister (e.g. ice reacting to zl3073x_i2c removal) then\nwalks pin->dpll_refs into dpll_device_ops(), which trips the WARN_ON and\ndereferences the missing registration. dpll_lock cannot help because the\nnotification work was queued before the unregistering driver took the\nlock.\n\nTreat the empty registration list as a legitimate transient state. Make\ndpll_priv() and dpll_device_ops() return NULL in that case and make\nevery pin netlink path that resolves a device from a pin skip such\ndplls. dpll_cmd_pin_get_one() picks a ref with a live registration and\nreturns -ENODEV when there is none, the pin dumpit skips such a pin\ninstead of aborting the dump, dpll_msg_add_pin_dplls() and the\nfrequency, esync, reference sync and phase adjust set paths skip dead\nrefs, and dpll_pin_parent_device_set() validates the parent with\ndpll_device_get_by_id(). dpll_pin_register() is the last caller that\ndereferenced the device ops without a check, so move its frequency\nmonitor validation under dpll_lock and tolerate a missing registration\nthere as well.\n\nThe empty registration list is equivalent to a cleared DPLL_REGISTERED\nmark, both transitions happen under dpll_lock in dpll_device_register()\nand dpll_device_unregister(). A pin notification for a pin whose dplls\nare all gone is now dropped with -ENODEV instead of crashing, all\ncallers in the core ignore that return value.\n\n WARNING: drivers/dpll/dpll_core.c:1092 at dpll_device_ops+0x24/0x40,\n CPU#83: kworker/u576:3/23471\n Modules linked in: ... ice ... zl3073x_i2c(-) ... zl3073x ...\n Workqueue: ice_dpll_wq ice_dpll_pin_notify_work [ice]\n RIP: 0010:dpll_device_ops+0x24/0x40\n Call Trace:\n  <TASK>\n  dpll_cmd_pin_get_one+0x336/0x520\n  dpll_pin_event_send+0x82/0x140\n  dpll_pin_on_pin_unregister+0xbb/0x160\n  ice_dpll_pin_notify_work+0x1bc/0x1f0 [ice]\n  process_one_work+0x19e/0x370\n  worker_thread+0x1a6/0x310\n  kthread+0xe4/0x120\n  ret_from_fork+0x1a1/0x270\n  ret_from_fork_asm+0x1a/0x30\n  </TASK>\n ---[ end trace 0000000000000000 ]---\n BUG: kernel NULL pointer dereference, address: 0000000000000010\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9431063ad323ac864750aeba4d304389bc42ca4e","status":"affected","lessThan":"7d9661d6ef60bee705a3bb220dc59f10d9155c31","versionType":"git"},{"version":"9431063ad323ac864750aeba4d304389bc42ca4e","status":"affected","lessThan":"d39da3ff8d39c31761bf1698bc02a5a206722136","versionType":"git"},{"version":"9431063ad323ac864750aeba4d304389bc42ca4e","status":"affected","lessThan":"fdbf04e3e01a872d0ef2149f846f1a3e3cb54f5b","versionType":"git"},{"version":"9431063ad323ac864750aeba4d304389bc42ca4e","status":"affected","lessThan":"33f016b23a219fe034213849b51436b8e79df251","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dpll/dpll_core.c","drivers/dpll/dpll_netlink.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.7","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/dpll/dpll_core.c","drivers/dpll/dpll_netlink.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/7d9661d6ef60bee705a3bb220dc59f10d9155c31"},{"url":"https://git.kernel.org/stable/c/d39da3ff8d39c31761bf1698bc02a5a206722136"},{"url":"https://git.kernel.org/stable/c/fdbf04e3e01a872d0ef2149f846f1a3e3cb54f5b"},{"url":"https://git.kernel.org/stable/c/33f016b23a219fe034213849b51436b8e79df251"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-21T12:50:03.630Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}