{"id":"CVE-2026-80999","title":"net: dsa: realtek: use gpiod_set_value_cansleep for reset GPIO","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: realtek: use gpiod_set_value_cansleep for reset GPIO\n\nrtl83xx_reset_assert() and rtl83xx_reset_deassert() are only called from\nthe probe path, which may sleep…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-663"],"vendor":"Linux","product":"Linux","affected":["Linux >= d8652956cf37c5caa8c19e0b99ce5ca235c6d5de < c32cf5292a0dd70c4afc138b4dc45743a190cd5a","Linux >= d8652956cf37c5caa8c19e0b99ce5ca235c6d5de < f71087e7c63aa3e99bf65d7ddf91eb4fd3545778","Linux >= d8652956cf37c5caa8c19e0b99ce5ca235c6d5de < 1610a8c2b93e815e3dc8643a2a69ab1c37975a6a","Linux >= d8652956cf37c5caa8c19e0b99ce5ca235c6d5de < fb58b6a696b30bcbfbe0cfc0a91b19c816a955fc","Linux 4.19"],"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:46:23.651Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80999","references":[{"url":"https://git.kernel.org/stable/c/c32cf5292a0dd70c4afc138b4dc45743a190cd5a"},{"url":"https://git.kernel.org/stable/c/f71087e7c63aa3e99bf65d7ddf91eb4fd3545778"},{"url":"https://git.kernel.org/stable/c/1610a8c2b93e815e3dc8643a2a69ab1c37975a6a"},{"url":"https://git.kernel.org/stable/c/fb58b6a696b30bcbfbe0cfc0a91b19c816a955fc"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80999.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80999"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532457"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80999"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80999"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80999.mbox"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00206,"epssPercentile":0.10477,"ingestedAt":"2026-09-14T00:35:28.531Z","slug":"CVE-2026-80999","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: realtek: use gpiod_set_value_cansleep for reset GPIO\n\nrtl83xx_reset_assert() and rtl83xx_reset_deassert() are only called from\nthe probe path, which may sleep and is not timing-critical.  When the\nreset GPIO is provided by a sleeping controller such as an I2C I/O\nexpander, gpiod_set_value() warns:\n\n  WARNING: drivers/gpio/gpiolib.c:4030 at gpiod_set_value+0x44/0x80, CPU#1: kworker/u16:4/61\n  Hardware name: B&O MAP CA33 Rev f (UNKNOWN) (DT)\n  Workqueue: events_unbound deferred_probe_work_func\n  pc : gpiod_set_value+0x44/0x80\n  lr : rtl83xx_probe+0x1d8/0x3a0\n  Call trace:\n   gpiod_set_value+0x44/0x80 (P)\n   rtl83xx_probe+0x1d8/0x3a0\n   realtek_mdio_probe+0x24/0xa0\n   mdio_probe+0x38/0x78\n   really_probe+0xc4/0x3e0\n   __driver_probe_device+0x15c/0x1b8\n   driver_probe_device+0xb4/0x120\n   __device_attach_driver+0xb8/0x1a0\n   bus_for_each_drv+0x88/0xf0\n   __device_attach+0xa0/0x1d8\n   device_initial_probe+0x54/0x68\n   bus_probe_device+0x38/0xa0\n   deferred_probe_work_func+0xb8/0x120\n   process_one_work+0x184/0x4e8\n   worker_thread+0x188/0x308\n   kthread+0x130/0x150\n   ret_from_fork+0x10/0x20\n\nSwitch both helpers to gpiod_set_value_cansleep() so such a reset GPIO can\nbe used without triggering the warning.\n\nThe reset GPIO has been driven with the non-sleeping gpiod_set_value()\nsince the driver was added in v4.19.  The call has since been refactored\nacross several files - from realtek-smi.c / realtek-mdio.c into the common\nrtl83xx.c module and then into the rtl83xx_reset_assert() and\nrtl83xx_reset_deassert() helpers (both in v6.9).  This patch therefore\napplies as-is only to kernels that carry those helpers (v6.9+); older\nstable kernels need the same gpiod_set_value_cansleep() conversion at the\ncorresponding open-coded call sites.\n\n## Affected\n\n- `Linux >= d8652956cf37c5caa8c19e0b99ce5ca235c6d5de < c32cf5292a0dd70c4afc138b4dc45743a190cd5a`\n- `Linux >= d8652956cf37c5caa8c19e0b99ce5ca235c6d5de < f71087e7c63aa3e99bf65d7ddf91eb4fd3545778`\n- `Linux >= d8652956cf37c5caa8c19e0b99ce5ca235c6d5de < 1610a8c2b93e815e3dc8643a2a69ab1c37975a6a`\n- `Linux >= d8652956cf37c5caa8c19e0b99ce5ca235c6d5de < fb58b6a696b30bcbfbe0cfc0a91b19c816a955fc`\n- `Linux 4.19`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80999.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":204146,"id":"CVE-2026-80999","ts":1789490232557,"field":"cvss","old":null,"new":"5.5"},{"seq":204145,"id":"CVE-2026-80999","ts":1789490232557,"field":"severity","old":"none","new":"medium"},{"seq":147187,"id":"CVE-2026-80999","ts":1789270199826,"field":"cvss","old":null,"new":"4.1"},{"seq":147186,"id":"CVE-2026-80999","ts":1789270199826,"field":"severity","old":"none","new":"medium"},{"seq":108930,"id":"CVE-2026-80999","ts":1789183729592,"field":"cvss","old":null,"new":"4.1"},{"seq":108929,"id":"CVE-2026-80999","ts":1789183729592,"field":"severity","old":"none","new":"medium"}]}