7.8

CVE-2023-53515

virtio-mmio: don't break lifecycle of vm_dev

In the Linux kernel, the following vulnerability has been resolved:

virtio-mmio: don't break lifecycle of vm_dev

vm_dev has a separate lifecycle because it has a 'struct device'
embedded. Thus, having a release callback for it is correct.

Allocating the vm_dev struct with devres totally breaks this protection,
though. Instead of waiting for the vm_dev release callback, the memory
is freed when the platform_device is removed. Resulting in a
use-after-free when finally the callback is to be called.

To easily see the problem, compile the kernel with
CONFIG_DEBUG_KOBJECT_RELEASE and unbind with sysfs.

The fix is easy, don't use devres in this case.

Found during my research about object lifetime problems.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.15.1 < 4.19.293
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.255
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.192
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.128
Linux ≫ Linux Kernel Version >= 5.16 < 6.1.47
Linux ≫ Linux Kernel Version >= 6.2 < 6.4.12
Linux ≫ Linux Kernel Version 4.15 Update -
Linux ≫ Linux Kernel Version 4.15 Update rc3
Linux ≫ Linux Kernel Version 4.15 Update rc4
Linux ≫ Linux Kernel Version 4.15 Update rc5
Linux ≫ Linux Kernel Version 4.15 Update rc6
Linux ≫ Linux Kernel Version 4.15 Update rc7
Linux ≫ Linux Kernel Version 4.15 Update rc8
Linux ≫ Linux Kernel Version 4.15 Update rc9
Linux ≫ Linux Kernel Version 6.5 Update rc1
Linux ≫ Linux Kernel Version 6.5 Update rc2
Linux ≫ Linux Kernel Version 6.5 Update rc3
Linux ≫ Linux Kernel Version 6.5 Update rc4
Linux ≫ Linux Kernel Version 6.5 Update rc5
Linux ≫ Linux Kernel Version 6.5 Update rc6
VulnDex Vulnerability Enrichment
Diese Information steht angemeldeten Benutzern zur Verfügung. Login Login
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.14% 0.036
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://git.kernel.org/stable/c/2dcb368fe5a8eee498ca75c93a18ce2f3b0d6a8e
Patch
https://git.kernel.org/stable/c/3ff54d904fafabd0912796785e53cce4e69ca123
Patch
https://git.kernel.org/stable/c/55c91fedd03d7b9cf0c5199b2eb12b9b8e95281a
Patch
https://git.kernel.org/stable/c/5b7d5c2dd664eb8b9a06ecbc06e28d39359c422e
Patch
https://git.kernel.org/stable/c/97a2d55ead76358245b446efd87818e919196d7a
Patch
https://git.kernel.org/stable/c/af5818c35173e096085c6ae2e3aac605d3d15e41
Patch
https://git.kernel.org/stable/c/b788ad3b2468512339c05f23692e36860264e674
Patch