uio: Fix stale info pointer in failed registration path

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93054
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:58 UTC
Updated2026-09-18 18:18:19 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: uio: Fix stale info pointer in failed registration path After device_add(), the UIO device is visible to userspace and /dev/uioX can be opened. If a later setup step fails, __uio_register_device() unwinds the device but leaves idev->info pointing at the caller-owned struct uio_info. That is unsafe when an opener races with the failed registration path. The open file keeps a reference to the uio_device, while the caller sees registration failure and may free its struct uio_info. Later file operations can then follow idev->info and dereference freed memory. Handle post-device_add() failures like unregister: remove UIO attributes while the info pointer is still valid, then clear idev->info under info_lock and wake existing waiters/async users before removing the device and minor. This makes already-open file descriptors observe the same "device gone" state as normal uio_unregister_device().

Risk And Classification

Primary CVSS: v3.1 7 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.002110000 probability, percentile 0.116490000 (date 2026-09-18)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a93e7b331568227500186a465fee3c2cb5dffd1f 63eaa7663335d482a8825c231213e312cacea567 git Not specified
CNA Linux Linux affected a93e7b331568227500186a465fee3c2cb5dffd1f df4faf65194ec6c315a59be4c6749eaeb3009243 git Not specified
CNA Linux Linux affected a93e7b331568227500186a465fee3c2cb5dffd1f 506b43dde5f9ac0068b1360e6b5dbee07fda59fb git Not specified
CNA Linux Linux affected a93e7b331568227500186a465fee3c2cb5dffd1f 15340b00e665af805523b08515294a1aa1778151 git Not specified
CNA Linux Linux affected a93e7b331568227500186a465fee3c2cb5dffd1f 234156f6c6d9ec35dc47abbcc3adc3c79fc6a5ac git Not specified
CNA Linux Linux affected a93e7b331568227500186a465fee3c2cb5dffd1f 16695e9059d80ea6661e8399064b0c01f641dd8c git Not specified
CNA Linux Linux affected a93e7b331568227500186a465fee3c2cb5dffd1f ec5bd6731183eb6f619140c9bef2ee11ed818c20 git Not specified
CNA Linux Linux affected a93e7b331568227500186a465fee3c2cb5dffd1f 67b6fc084b034a91c3ec7907a3fed89a2450f30b git Not specified
CNA Linux Linux affected 085d735c858934e5d5bfaedb1fc98bd9135e6ff1 git Not specified
CNA Linux Linux affected 4.14.100 4.15 semver Not specified
CNA Linux Linux affected 4.18 Not specified
CNA Linux Linux unaffected 4.18 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/df4faf65194ec6c315a59be4c6749eaeb3009243 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/67b6fc084b034a91c3ec7907a3fed89a2450f30b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/234156f6c6d9ec35dc47abbcc3adc3c79fc6a5ac 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/16695e9059d80ea6661e8399064b0c01f641dd8c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/15340b00e665af805523b08515294a1aa1778151 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ec5bd6731183eb6f619140c9bef2ee11ed818c20 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/63eaa7663335d482a8825c231213e312cacea567 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/506b43dde5f9ac0068b1360e6b5dbee07fda59fb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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