{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-93054", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-17T15:57:05.658Z", "datePublished": "2026-09-17T16:10:43.104Z", "dateUpdated": "2026-10-19T09:04:49.183Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:04:49.183Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nuio: Fix stale info pointer in failed registration path\n\nAfter device_add(), the UIO device is visible to userspace and /dev/uioX\ncan be opened. If a later setup step fails, __uio_register_device()\nunwinds the device but leaves idev->info pointing at the caller-owned\nstruct uio_info.\n\nThat is unsafe when an opener races with the failed registration path.\nThe open file keeps a reference to the uio_device, while the caller sees\nregistration failure and may free its struct uio_info. Later file\noperations can then follow idev->info and dereference freed memory.\n\nHandle post-device_add() failures like unregister: remove UIO attributes\nwhile the info pointer is still valid, then clear idev->info under\ninfo_lock and wake existing waiters/async users before removing the\ndevice and minor. This makes already-open file descriptors observe the\nsame \"device gone\" state as normal uio_unregister_device()." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - After device_add() in __uio_register_device(), the char device is opened via open(2) on /dev/uioN into uio_open(); the dangling idev->info is then used by uio_write/uio_mmap/uio_release on that fd. Callers such as tcmu_configure_device() (configfs enable) and uio_pci_generic probe() register locally; no remote protocol carries the trigger.\nAC:H - The stale-info unwind runs only when uio_dev_add_attributes() (kobject_create_and_add/kobject_add/kobject_uevent for maps/portio) or request_threaded_irq() fails after device_add(). Those fail on -ENOMEM, kernfs errors, or IRQ setup failure the attacker cannot force; a successful register never leaves idev->info set after the caller drops struct uio_info.\nPR:L - uio_open() has no capable() check, and uio_pci_generic installs no info->open hook, so the racing open is gated only by /dev/uioN inode mode. Reasonable UIO deployments (DPDK udev, tcmu-runner) grant that node to a non-root account that can also write target_dev_enable_store (TCMU) or hold the fd across a failing probe.\nUI:N - The same actor can write target_dev_enable_store (echo 1 > enable -> tcmu_configure_device -> uio_register_device) or bind uio_pci_generic while another thread open()s /dev/uioN and then mmap/write/close; no other user must mount media or confirm a prompt.\nS:U - The use-after-free is idev->info in the host UIO core (uio_write/uio_mmap/uio_release) after the caller (e.g. devm unwind of uio_pci_generic's struct uio_pci_generic_dev) frees struct uio_info; impact stays in the host kernel, not a KVM/Xen, IOMMU, or sandbox escape.\nC:H - After the caller frees struct uio_info, uio_read and uio_mmap still treat the non-NULL idev->info as live and read info->irq, info->mem[], and related fields. Reclaiming that slab object gives an arbitrary kernel read through those file operations.\nI:H - uio_write() calls idev->info->irqcontrol, uio_open() calls info->open, and uio_release() calls info->release on the freed uio_info; uio_mmap_physical() feeds info->mem[].addr into remap_pfn_range(). Spraying the object hijacks those function pointers or the PFN map for an arbitrary write/CFI primitive.\nA:H - uio_write/uio_mmap/uio_release and uio_vma_fault dereference the freed idev->info (and TCMU's tcmu_vma_fault uses info->mem[].addr after vfree(mb_addr) on err_register), which oopses or panics the kernel even without a successful spray." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/uio/uio.c" ], "versions": [ { "version": "a93e7b331568227500186a465fee3c2cb5dffd1f", "lessThan": "63eaa7663335d482a8825c231213e312cacea567", "status": "affected", "versionType": "git" }, { "version": "a93e7b331568227500186a465fee3c2cb5dffd1f", "lessThan": "df4faf65194ec6c315a59be4c6749eaeb3009243", "status": "affected", "versionType": "git" }, { "version": "a93e7b331568227500186a465fee3c2cb5dffd1f", "lessThan": "506b43dde5f9ac0068b1360e6b5dbee07fda59fb", "status": "affected", "versionType": "git" }, { "version": "a93e7b331568227500186a465fee3c2cb5dffd1f", "lessThan": "15340b00e665af805523b08515294a1aa1778151", "status": "affected", "versionType": "git" }, { "version": "a93e7b331568227500186a465fee3c2cb5dffd1f", "lessThan": "234156f6c6d9ec35dc47abbcc3adc3c79fc6a5ac", "status": "affected", "versionType": "git" }, { "version": "a93e7b331568227500186a465fee3c2cb5dffd1f", "lessThan": "16695e9059d80ea6661e8399064b0c01f641dd8c", "status": "affected", "versionType": "git" }, { "version": "a93e7b331568227500186a465fee3c2cb5dffd1f", "lessThan": "ec5bd6731183eb6f619140c9bef2ee11ed818c20", "status": "affected", "versionType": "git" }, { "version": "a93e7b331568227500186a465fee3c2cb5dffd1f", "lessThan": "67b6fc084b034a91c3ec7907a3fed89a2450f30b", "status": "affected", "versionType": "git" }, { "version": "085d735c858934e5d5bfaedb1fc98bd9135e6ff1", "status": "affected", "versionType": "git" }, { "version": "4.14.100", "lessThan": "4.15", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/uio/uio.c" ], "versions": [ { "version": "4.18", "status": "affected" }, { "version": "0", "lessThan": "4.18", "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": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "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": "4.18", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.18", "versionEndExcluding": "7.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14.100" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/63eaa7663335d482a8825c231213e312cacea567" }, { "url": "https://git.kernel.org/stable/c/df4faf65194ec6c315a59be4c6749eaeb3009243" }, { "url": "https://git.kernel.org/stable/c/506b43dde5f9ac0068b1360e6b5dbee07fda59fb" }, { "url": "https://git.kernel.org/stable/c/15340b00e665af805523b08515294a1aa1778151" }, { "url": "https://git.kernel.org/stable/c/234156f6c6d9ec35dc47abbcc3adc3c79fc6a5ac" }, { "url": "https://git.kernel.org/stable/c/16695e9059d80ea6661e8399064b0c01f641dd8c" }, { "url": "https://git.kernel.org/stable/c/ec5bd6731183eb6f619140c9bef2ee11ed818c20" }, { "url": "https://git.kernel.org/stable/c/67b6fc084b034a91c3ec7907a3fed89a2450f30b" } ], "title": "uio: Fix stale info pointer in failed registration path", "x_generator": { "engine": "bippy-1.2.0" } } } }