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Date: Tue, 27 Feb 2024 10:48:55 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2021-46934: i2c: validate user data in compat ioctl Description =========== In the Linux kernel, the following vulnerability has been resolved: i2c: validate user data in compat ioctl Wrong user data may cause warning in i2c_transfer(), ex: zero msgs. Userspace should not be able to trigger warnings, so this patch adds validation checks for user data in compact ioctl to prevent reported warnings The Linux kernel CVE team has assigned CVE-2021-46934 to this issue. Affected and fixed versions =========================== Issue introduced in 4.15 with commit 7d5cb45655f2 and fixed in 4.19.224 with commit 407c8708fb1b Issue introduced in 4.15 with commit 7d5cb45655f2 and fixed in 5.4.170 with commit 9e4a3f47eff4 Issue introduced in 4.15 with commit 7d5cb45655f2 and fixed in 5.10.90 with commit 8d31cbab4c29 Issue introduced in 4.15 with commit 7d5cb45655f2 and fixed in 5.15.13 with commit f68599581067 Issue introduced in 4.15 with commit 7d5cb45655f2 and fixed in 5.16 with commit bb436283e25a Please see https://www.kernel.org or 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-2021-46934 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/i2c/i2c-dev.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/407c8708fb1bf2d4afc5337ef50635cf540c364b https://git.kernel.org/stable/c/9e4a3f47eff476097e0c7faac04d1831fc70237d https://git.kernel.org/stable/c/8d31cbab4c295d7010ebb729e9d02d0e9cece18f https://git.kernel.org/stable/c/f68599581067e8a5a8901ba9eb270b4519690e26 https://git.kernel.org/stable/c/bb436283e25aaf1533ce061605d23a9564447bdf
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