7.8

CVE-2026-31650

mmc: vub300: fix use-after-free on disconnect

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

mmc: vub300: fix use-after-free on disconnect

The vub300 driver maintains an explicit reference count for the
controller and its driver data and the last reference can in theory be
dropped after the driver has been unbound.

This specifically means that the controller allocation must not be
device managed as that can lead to use-after-free.

Note that the lifetime is currently also incorrectly tied the parent USB
device rather than interface, which can lead to memory leaks if the
driver is unbound without its device being physically disconnected (e.g.
on probe deferral).

Fix both issues by reverting to non-managed allocation of the controller.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 6.17.1 < 6.18.23
Linux ≫ Linux Kernel Version >= 6.19 < 6.19.13
Linux ≫ Linux Kernel Version 6.17 Update -
Linux ≫ Linux Kernel Version 7.0 Update rc1
Linux ≫ Linux Kernel Version 7.0 Update rc2
Linux ≫ Linux Kernel Version 7.0 Update rc3
Linux ≫ Linux Kernel Version 7.0 Update rc4
Linux ≫ Linux Kernel Version 7.0 Update rc5
Linux ≫ Linux Kernel Version 7.0 Update rc6
Linux ≫ Linux Kernel Version 7.0 Update rc7
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.12% 0.018
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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/ea7468f61be033f4e18b95f2912010ed1d175d75
Patch
https://git.kernel.org/stable/c/ef0448c569b37ceabdd038e9faa311e5179127b0
Patch
https://git.kernel.org/stable/c/8f4d20a710225ec7a565f6a0459862d3b1f32330
Patch