{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89597", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.731Z", "datePublished": "2026-09-11T19:44:59.538Z", "dateUpdated": "2026-10-19T08:49:29.665Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:49:29.665Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: uvesafb: unregister connector callback on init failure\n\nuvesafb_init() registers the v86d connector callback before registering\nthe platform driver. If platform_driver_register() fails, the function\nreturns the error directly and leaves the connector callback registered.\n\nThe later platform-device failure path already unregisters the callback.\nAdd the same cleanup before the final return when platform-driver\nregistration fails.\n\nThis issue was identified during our ongoing static-analysis research while\nreviewing kernel code." } ], "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 - The leftover v86d connector callback is reached only via a local NETLINK_CONNECTOR socket: cn_rx_skb() -> cn_call_callback() invokes the registered handler. There is no remote packet, Bluetooth/WiFi, or USB path into this code.\nAC:L - Once platform_driver_register() fails, cn_add_callback() has already left uvesafb_cn_callback on the global connector list while free_module() unmaps the driver. A single NETLINK_CONNECTOR message with CN_IDX_V86D/CN_VAL_V86D_UVESAFB then calls that stale pointer with no race or other condition beyond the attacker's control.\nPR:L - Unprivileged users may create NETLINK_CONNECTOR sockets and send to kernel portid 0 without CAP_NET_ADMIN. The callback's capable(CAP_SYS_ADMIN) check never runs because the UAF occurs at the call through the freed module text, so init-namespace root is not required.\nUI:N - The attacker sends the netlink message from their own process. No separate victim action such as mounting a filesystem, opening a device node, or loading a module is required to hit the dangling callback.\nS:U - The stale function pointer and freed uvesafb module memory are kernel-side resources in the same security authority. This is local privilege escalation, not VM escape, IOMMU bypass, or another cross-boundary impact.\nC:H - The leftover cn_callback_entry still points at uvesafb_cn_callback in freed module text. That use-after-free lets an attacker reclaim the pages and obtain an arbitrary kernel read primitive.\nI:H - Calling through a function pointer that resides in freed module memory is a control-flow hijack once those pages are reallocated, giving an arbitrary write and code-execution primitive.\nA:H - Invoking the stale connector callback jumps into unmapped or reused module text and reliably oopses or panics the kernel even if the attacker does not fully exploit the UAF." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/video/fbdev/uvesafb.c" ], "versions": [ { "version": "8bdb3a2d7df48b861972c4bfb58490853a228f51", "lessThan": "b149f77d04082a9da75944cdc488becb0e35258f", "status": "affected", "versionType": "git" }, { "version": "8bdb3a2d7df48b861972c4bfb58490853a228f51", "lessThan": "0352fdac3cbf11e3b323322ff8cd95e20cbf5cd7", "status": "affected", "versionType": "git" }, { "version": "8bdb3a2d7df48b861972c4bfb58490853a228f51", "lessThan": "17518e7123f7ef01b1155064dc01f2087583908e", "status": "affected", "versionType": "git" }, { "version": "8bdb3a2d7df48b861972c4bfb58490853a228f51", "lessThan": "9eb7b3cbe99c9c0edbff69eb155c723e30983c22", "status": "affected", "versionType": "git" }, { "version": "8bdb3a2d7df48b861972c4bfb58490853a228f51", "lessThan": "9f8a822b44c42502f105cf6574f4867067eecdd0", "status": "affected", "versionType": "git" }, { "version": "8bdb3a2d7df48b861972c4bfb58490853a228f51", "lessThan": "466a8af0dee2cf745307155e26884e19a37b7e15", "status": "affected", "versionType": "git" }, { "version": "8bdb3a2d7df48b861972c4bfb58490853a228f51", "lessThan": "9e768ae51426af2034d479133cfd73010d641b1a", "status": "affected", "versionType": "git" }, { "version": "8bdb3a2d7df48b861972c4bfb58490853a228f51", "lessThan": "de8db23aa7c337e606fca9faf48b3ba72968597a", "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/video/fbdev/uvesafb.c" ], "versions": [ { "version": "2.6.24", "status": "affected" }, { "version": "0", "lessThan": "2.6.24", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "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": "2.6.24", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.24", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.24", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.24", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.24", "versionEndExcluding": "6.12.109" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.24", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.24", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.24", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/b149f77d04082a9da75944cdc488becb0e35258f" }, { "url": "https://git.kernel.org/stable/c/0352fdac3cbf11e3b323322ff8cd95e20cbf5cd7" }, { "url": "https://git.kernel.org/stable/c/17518e7123f7ef01b1155064dc01f2087583908e" }, { "url": "https://git.kernel.org/stable/c/9eb7b3cbe99c9c0edbff69eb155c723e30983c22" }, { "url": "https://git.kernel.org/stable/c/9f8a822b44c42502f105cf6574f4867067eecdd0" }, { "url": "https://git.kernel.org/stable/c/466a8af0dee2cf745307155e26884e19a37b7e15" }, { "url": "https://git.kernel.org/stable/c/9e768ae51426af2034d479133cfd73010d641b1a" }, { "url": "https://git.kernel.org/stable/c/de8db23aa7c337e606fca9faf48b3ba72968597a" } ], "title": "fbdev: uvesafb: unregister connector callback on init failure", "x_generator": { "engine": "bippy-1.2.0" } } } }