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Message-ID: <2024052450-CVE-2021-47500-3c02@gregkh> Date: Fri, 24 May 2024 17:01:49 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2021-47500: iio: mma8452: Fix trigger reference couting Description =========== In the Linux kernel, the following vulnerability has been resolved: iio: mma8452: Fix trigger reference couting The mma8452 driver directly assigns a trigger to the struct iio_dev. The IIO core when done using this trigger will call `iio_trigger_put()` to drop the reference count by 1. Without the matching `iio_trigger_get()` in the driver the reference count can reach 0 too early, the trigger gets freed while still in use and a use-after-free occurs. Fix this by getting a reference to the trigger before assigning it to the IIO device. The Linux kernel CVE team has assigned CVE-2021-47500 to this issue. Affected and fixed versions =========================== Issue introduced in 4.2 with commit ae6d9ce05691 and fixed in 4.4.295 with commit 094d513b78b1 Issue introduced in 4.2 with commit ae6d9ce05691 and fixed in 4.9.293 with commit fb75cc4740d8 Issue introduced in 4.2 with commit ae6d9ce05691 and fixed in 4.14.258 with commit 794c0898f6bf Issue introduced in 4.2 with commit ae6d9ce05691 and fixed in 4.19.221 with commit f5deab10ced3 Issue introduced in 4.2 with commit ae6d9ce05691 and fixed in 5.4.165 with commit acf0088ac073 Issue introduced in 4.2 with commit ae6d9ce05691 and fixed in 5.10.85 with commit db12d9508536 Issue introduced in 4.2 with commit ae6d9ce05691 and fixed in 5.15.8 with commit c43517071dfc Issue introduced in 4.2 with commit ae6d9ce05691 and fixed in 5.16 with commit cd0082235783 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-2021-47500 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/iio/accel/mma8452.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/094d513b78b1714113bc016684b8142382e071ba https://git.kernel.org/stable/c/fb75cc4740d81264cd5bcb0e17d961d018a8be96 https://git.kernel.org/stable/c/794c0898f6bf39a458655d5fb4af70ec43a5cfcb https://git.kernel.org/stable/c/f5deab10ced368c807866283f8b79144c4823be8 https://git.kernel.org/stable/c/acf0088ac073ca6e7f4cad6acac112177e08df5e https://git.kernel.org/stable/c/db12d95085367de8b0223929d1332731024441f1 https://git.kernel.org/stable/c/c43517071dfc9fce34f8f69dbb98a86017f6b739 https://git.kernel.org/stable/c/cd0082235783f814241a1c9483fb89e405f4f892
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