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Message-ID: <2024053035-CVE-2024-36898-942c@gregkh> Date: Thu, 30 May 2024 17:28:50 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-36898: gpiolib: cdev: fix uninitialised kfifo Description =========== In the Linux kernel, the following vulnerability has been resolved: gpiolib: cdev: fix uninitialised kfifo If a line is requested with debounce, and that results in debouncing in software, and the line is subsequently reconfigured to enable edge detection then the allocation of the kfifo to contain edge events is overlooked. This results in events being written to and read from an uninitialised kfifo. Read events are returned to userspace. Initialise the kfifo in the case where the software debounce is already active. The Linux kernel CVE team has assigned CVE-2024-36898 to this issue. Affected and fixed versions =========================== Issue introduced in 5.10 with commit 65cff7046406 and fixed in 6.1.91 with commit 1a51e24404d7 Issue introduced in 5.10 with commit 65cff7046406 and fixed in 6.6.31 with commit 883e4bbf06eb Issue introduced in 5.10 with commit 65cff7046406 and fixed in 6.8.10 with commit bd7139a70ee8 Issue introduced in 5.10 with commit 65cff7046406 and fixed in 6.9 with commit ee0166b637a5 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2024-36898 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: drivers/gpio/gpiolib-cdev.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/1a51e24404d77bb3307c1e39eee0d8e86febb1a5 https://git.kernel.org/stable/c/883e4bbf06eb5fb7482679e4edb201093e9f55a2 https://git.kernel.org/stable/c/bd7139a70ee8d8ea872b223e043730cf6f5e2b0e https://git.kernel.org/stable/c/ee0166b637a5e376118e9659e5b4148080f1d27e
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