Description
In 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().
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
a93e7b331568227500186a465fee3c2cb5dffd1f to < 63eaa7663335d482a8825c231213e312cacea567affecteda93e7b331568227500186a465fee3c2cb5dffd1f to < df4faf65194ec6c315a59be4c6749eaeb3009243affecteda93e7b331568227500186a465fee3c2cb5dffd1f to < 506b43dde5f9ac0068b1360e6b5dbee07fda59fbaffecteda93e7b331568227500186a465fee3c2cb5dffd1f to < 15340b00e665af805523b08515294a1aa1778151affecteda93e7b331568227500186a465fee3c2cb5dffd1f to < 234156f6c6d9ec35dc47abbcc3adc3c79fc6a5acaffecteda93e7b331568227500186a465fee3c2cb5dffd1f to < 16695e9059d80ea6661e8399064b0c01f641dd8caffecteda93e7b331568227500186a465fee3c2cb5dffd1f to < ec5bd6731183eb6f619140c9bef2ee11ed818c20affecteda93e7b331568227500186a465fee3c2cb5dffd1f to < 67b6fc084b034a91c3ec7907a3fed89a2450f30baffected085d735c858934e5d5bfaedb1fc98bd9135e6ff1affected4.14.100 to < 4.15affected
Linux Linux
Default version status: affected
4.18affected0 to < 4.18unaffected5.10.270 to ≤ 5.10.*unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.110 to ≤ 6.12.*unaffected6.18.52 to ≤ 6.18.*unaffected7.2.6 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/63eaa7663335d482a8825c231213e312cacea567 ↗
- https://git.kernel.org/stable/c/df4faf65194ec6c315a59be4c6749eaeb3009243 ↗
- https://git.kernel.org/stable/c/506b43dde5f9ac0068b1360e6b5dbee07fda59fb ↗
- https://git.kernel.org/stable/c/15340b00e665af805523b08515294a1aa1778151 ↗
- https://git.kernel.org/stable/c/234156f6c6d9ec35dc47abbcc3adc3c79fc6a5ac ↗
- https://git.kernel.org/stable/c/16695e9059d80ea6661e8399064b0c01f641dd8c ↗
- https://git.kernel.org/stable/c/ec5bd6731183eb6f619140c9bef2ee11ed818c20 ↗
- https://git.kernel.org/stable/c/67b6fc084b034a91c3ec7907a3fed89a2450f30b ↗