CVE-2026-93054

{"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"}}}}

{}

{"affected": [{"affectedData": [{"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", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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()."}], "id": "CVE-2026-93054", "lastModified": "2026-10-19T10:16:55.230", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-17T17:17:58.923", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/15340b00e665af805523b08515294a1aa1778151"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/16695e9059d80ea6661e8399064b0c01f641dd8c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/234156f6c6d9ec35dc47abbcc3adc3c79fc6a5ac"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/506b43dde5f9ac0068b1360e6b5dbee07fda59fb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/63eaa7663335d482a8825c231213e312cacea567"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/67b6fc084b034a91c3ec7907a3fed89a2450f30b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/df4faf65194ec6c315a59be4c6749eaeb3009243"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ec5bd6731183eb6f619140c9bef2ee11ed818c20"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a93e7b331568227500186a465fee3c2cb5dffd1f,63eaa7663335d482a8825c231213e312cacea567)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a93e7b331568227500186a465fee3c2cb5dffd1f,df4faf65194ec6c315a59be4c6749eaeb3009243)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a93e7b331568227500186a465fee3c2cb5dffd1f,506b43dde5f9ac0068b1360e6b5dbee07fda59fb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a93e7b331568227500186a465fee3c2cb5dffd1f,15340b00e665af805523b08515294a1aa1778151)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a93e7b331568227500186a465fee3c2cb5dffd1f,234156f6c6d9ec35dc47abbcc3adc3c79fc6a5ac)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a93e7b331568227500186a465fee3c2cb5dffd1f,16695e9059d80ea6661e8399064b0c01f641dd8c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a93e7b331568227500186a465fee3c2cb5dffd1f,ec5bd6731183eb6f619140c9bef2ee11ed818c20)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a93e7b331568227500186a465fee3c2cb5dffd1f,67b6fc084b034a91c3ec7907a3fed89a2450f30b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "085d735c858934e5d5bfaedb1fc98bd9135e6ff1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.14.100,4.15)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "4.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,4.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.270,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.221,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.188,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.157,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.110,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.52,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-19T07:00:11.404876+00:00", "updated": "2026-09-20T05:30:16.593658+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416"]}