{"api_version":"1","generated_at":"2026-09-19T16:59:13+00:00","cve":"CVE-2026-93054","urls":{"html":"https://cve.report/CVE-2026-93054","api":"https://cve.report/api/cve/CVE-2026-93054.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-93054","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-93054"},"summary":{"title":"uio: Fix stale info pointer in failed registration path","description":"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().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:17:58","updated_at":"2026-09-18 18:18:19"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"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","attackVector":"LOCAL","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/df4faf65194ec6c315a59be4c6749eaeb3009243","name":"https://git.kernel.org/stable/c/df4faf65194ec6c315a59be4c6749eaeb3009243","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/67b6fc084b034a91c3ec7907a3fed89a2450f30b","name":"https://git.kernel.org/stable/c/67b6fc084b034a91c3ec7907a3fed89a2450f30b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/234156f6c6d9ec35dc47abbcc3adc3c79fc6a5ac","name":"https://git.kernel.org/stable/c/234156f6c6d9ec35dc47abbcc3adc3c79fc6a5ac","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/16695e9059d80ea6661e8399064b0c01f641dd8c","name":"https://git.kernel.org/stable/c/16695e9059d80ea6661e8399064b0c01f641dd8c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/15340b00e665af805523b08515294a1aa1778151","name":"https://git.kernel.org/stable/c/15340b00e665af805523b08515294a1aa1778151","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ec5bd6731183eb6f619140c9bef2ee11ed818c20","name":"https://git.kernel.org/stable/c/ec5bd6731183eb6f619140c9bef2ee11ed818c20","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/63eaa7663335d482a8825c231213e312cacea567","name":"https://git.kernel.org/stable/c/63eaa7663335d482a8825c231213e312cacea567","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/506b43dde5f9ac0068b1360e6b5dbee07fda59fb","name":"https://git.kernel.org/stable/c/506b43dde5f9ac0068b1360e6b5dbee07fda59fb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93054","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93054","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a93e7b331568227500186a465fee3c2cb5dffd1f 63eaa7663335d482a8825c231213e312cacea567 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a93e7b331568227500186a465fee3c2cb5dffd1f df4faf65194ec6c315a59be4c6749eaeb3009243 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a93e7b331568227500186a465fee3c2cb5dffd1f 506b43dde5f9ac0068b1360e6b5dbee07fda59fb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a93e7b331568227500186a465fee3c2cb5dffd1f 15340b00e665af805523b08515294a1aa1778151 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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4.18","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.18 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.270 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.221 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.188 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.52 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.6 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"93054","cve":"CVE-2026-93054","epss":"0.002110000","percentile":"0.116490000","score_date":"2026-09-18","updated_at":"2026-09-19 00:06:16"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/uio/uio.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"63eaa7663335d482a8825c231213e312cacea567","status":"affected","version":"a93e7b331568227500186a465fee3c2cb5dffd1f","versionType":"git"},{"lessThan":"df4faf65194ec6c315a59be4c6749eaeb3009243","status":"affected","version":"a93e7b331568227500186a465fee3c2cb5dffd1f","versionType":"git"},{"lessThan":"506b43dde5f9ac0068b1360e6b5dbee07fda59fb","status":"affected","version":"a93e7b331568227500186a465fee3c2cb5dffd1f","versionType":"git"},{"lessThan":"15340b00e665af805523b08515294a1aa1778151","status":"affected","version":"a93e7b331568227500186a465fee3c2cb5dffd1f","versionType":"git"},{"lessThan":"234156f6c6d9ec35dc47abbcc3adc3c79fc6a5ac","status":"affected","version":"a93e7b331568227500186a465fee3c2cb5dffd1f","versionType":"git"},{"lessThan":"16695e9059d80ea6661e8399064b0c01f641dd8c","status":"affected","version":"a93e7b331568227500186a465fee3c2cb5dffd1f","versionType":"git"},{"lessThan":"ec5bd6731183eb6f619140c9bef2ee11ed818c20","status":"affected","version":"a93e7b331568227500186a465fee3c2cb5dffd1f","versionType":"git"},{"lessThan":"67b6fc084b034a91c3ec7907a3fed89a2450f30b","status":"affected","version":"a93e7b331568227500186a465fee3c2cb5dffd1f","versionType":"git"},{"status":"affected","version":"085d735c858934e5d5bfaedb1fc98bd9135e6ff1","versionType":"git"},{"lessThan":"4.15","status":"affected","version":"4.14.100","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/uio/uio.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.18"},{"lessThan":"4.18","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.270","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.221","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.188","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.157","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.52","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.270","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.221","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.188","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14.100","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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":{"baseScore":7,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"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."}]}],"providerMetadata":{"dateUpdated":"2026-09-18T17:55:48.391Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-93054","datePublished":"2026-09-17T16:10:43.104Z","dateReserved":"2026-09-17T15:57:05.658Z","dateUpdated":"2026-09-18T17:55:48.391Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:17:58","lastModifiedDate":"2026-09-18 18:18:19","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"LOCAL","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"93054","Ordinal":"1","Title":"uio: Fix stale info pointer in failed registration path","CVE":"CVE-2026-93054","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"93054","Ordinal":"1","NoteData":"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().","Type":"Description","Title":"uio: Fix stale info pointer in failed registration path"}]}}}