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vuln-cve/data/2026/89xxx/CVE-2026-89585.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-89585",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-09-11T19:38:34.729Z",
"datePublished": "2026-09-11T19:44:50.592Z",
"dateUpdated": "2026-10-19T08:49:17.989Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-19T08:49:17.989Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nauxdisplay: charlcd: cancel backlight work on registration failure\n\nWith CONFIG_CHARLCD_BL_FLASH, charlcd_init() schedules bl_work before\ncharlcd_register() calls misc_register(). If registration fails, the\ncaller frees the charlcd object while delayed work still contains its\naddress.\n\nAdd charlcd_deinit() to cancel the delayed work and turn the backlight\noff. Use it for both registration rollback and normal unregistration."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - charlcd_register() is reached only from local auxdisplay probe (hd44780 platform, lcd2s I2C, panel parport) on character LCDs in embedded, industrial, and appliance systems; there is no network or USB-host packet path into this misc-registration error path.\nAC:L - CONFIG_CHARLCD_BL_FLASH is the default, so charlcd_init() always queues bl_work (L* poke, 4s) before misc_register(); a second charlcd consumer or LCD_MINOR 156 collision makes registration fail deterministically, then the work runs on the freed object with no attacker-uncontrollable race.\nPR:L - On multi-display or mixed hd44780/lcd2s/panel systems the second probe runs automatically at boot without init-namespace root, and an unprivileged local user can spray the heap in the 4s window; embedded/kiosk sysfs bind is also not strictly root-only. Uncertain vs High, so Low.\nUI:N - The UAF is armed during driver probe and consumed by the kernel workqueue; no victim needs to open /dev/lcd, mount a filesystem, or take any other interactive action.\nS:U - The delayed-work UAF corrupts in-kernel charlcd_priv/work_struct heap state and can escalate only within the host kernel; it does not cross a VM, IOMMU, or sandbox boundary.\nC:H - charlcd_bl_off() does container_of() on the freed delayed_work and reads priv fields, including lcd.ops, from reclaimable slab, giving a use-after-free kernel read primitive.\nI:H - The same callback invokes priv->lcd.ops->backlight on the freed object, so reclaiming the slab with a forged ops table yields a kernel function-pointer call, arbitrary write, and control-flow hijack.\nA:H - Running delayed work after charlcd_free() oopses or panics via mutex_lock on freed bl_tempo_lock or a wild ops pointer, even when the UAF is not fully exploited."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/auxdisplay/charlcd.c"
],
"versions": [
{
"version": "39f8ea46724efbed3ca021863a22337c31be264c",
"lessThan": "cd97b3c68fe3c06c8067cc59d7dff976c5b7ea04",
"status": "affected",
"versionType": "git"
},
{
"version": "39f8ea46724efbed3ca021863a22337c31be264c",
"lessThan": "22586432c1aba89d9bd33f3173408dac830f220b",
"status": "affected",
"versionType": "git"
},
{
"version": "39f8ea46724efbed3ca021863a22337c31be264c",
"lessThan": "6eaed64a32e550daf0dc9549742b3ab9e41d984f",
"status": "affected",
"versionType": "git"
},
{
"version": "39f8ea46724efbed3ca021863a22337c31be264c",
"lessThan": "fe7ba73dde94c5f413b1588cd444b49105015dda",
"status": "affected",
"versionType": "git"
},
{
"version": "39f8ea46724efbed3ca021863a22337c31be264c",
"lessThan": "84858671842ae5857b9ed1202b62f9045373dcd1",
"status": "affected",
"versionType": "git"
},
{
"version": "39f8ea46724efbed3ca021863a22337c31be264c",
"lessThan": "ff2fb3c1e60cb247ea3e28c0ea0bea81c18f7755",
"status": "affected",
"versionType": "git"
},
{
"version": "39f8ea46724efbed3ca021863a22337c31be264c",
"lessThan": "e3e3bf40916c1e810df03958cfa7ba6883cdce79",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/auxdisplay/charlcd.c"
],
"versions": [
{
"version": "4.12",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.12",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.221",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.188",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.157",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.109",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.50",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.4",
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.12",
"versionEndExcluding": "5.15.221"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.12",
"versionEndExcluding": "6.1.188"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.12",
"versionEndExcluding": "6.6.157"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.12",
"versionEndExcluding": "6.12.109"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.12",
"versionEndExcluding": "6.18.50"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.12",
"versionEndExcluding": "7.2.4"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.12",
"versionEndExcluding": "7.3"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/cd97b3c68fe3c06c8067cc59d7dff976c5b7ea04"
},
{
"url": "https://git.kernel.org/stable/c/22586432c1aba89d9bd33f3173408dac830f220b"
},
{
"url": "https://git.kernel.org/stable/c/6eaed64a32e550daf0dc9549742b3ab9e41d984f"
},
{
"url": "https://git.kernel.org/stable/c/fe7ba73dde94c5f413b1588cd444b49105015dda"
},
{
"url": "https://git.kernel.org/stable/c/84858671842ae5857b9ed1202b62f9045373dcd1"
},
{
"url": "https://git.kernel.org/stable/c/ff2fb3c1e60cb247ea3e28c0ea0bea81c18f7755"
},
{
"url": "https://git.kernel.org/stable/c/e3e3bf40916c1e810df03958cfa7ba6883cdce79"
}
],
"title": "auxdisplay: charlcd: cancel backlight work on registration failure",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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