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vuln-cve/data/2026/93xxx/CVE-2026-93054.json
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{
"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"
}
}
}
}
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