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Date: Wed, 1 May 2024 07:21:25 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-26934: USB: core: Fix deadlock in usb_deauthorize_interface() Description =========== In the Linux kernel, the following vulnerability has been resolved: USB: core: Fix deadlock in usb_deauthorize_interface() Among the attribute file callback routines in drivers/usb/core/sysfs.c, the interface_authorized_store() function is the only one which acquires a device lock on an ancestor device: It calls usb_deauthorize_interface(), which locks the interface's parent USB device. The will lead to deadlock if another process already owns that lock and tries to remove the interface, whether through a configuration change or because the device has been disconnected. As part of the removal procedure, device_del() waits for all ongoing sysfs attribute callbacks to complete. But usb_deauthorize_interface() can't complete until the device lock has been released, and the lock won't be released until the removal has finished. The mechanism provided by sysfs to prevent this kind of deadlock is to use the sysfs_break_active_protection() function, which tells sysfs not to wait for the attribute callback. Reported-and-tested by: Yue Sun <samsun1006219@...il.com> Reported by: xingwei lee <xrivendell7@...il.com> The Linux kernel CVE team has assigned CVE-2024-26934 to this issue. Affected and fixed versions =========================== Issue introduced in 4.4 with commit 310d2b4124c0 and fixed in 4.19.312 with commit 8cbdd324b415 Issue introduced in 4.4 with commit 310d2b4124c0 and fixed in 5.4.274 with commit 12d6a5681a0a Issue introduced in 4.4 with commit 310d2b4124c0 and fixed in 5.10.215 with commit e451709573f8 Issue introduced in 4.4 with commit 310d2b4124c0 and fixed in 5.15.154 with commit 1b175bc579f4 Issue introduced in 4.4 with commit 310d2b4124c0 and fixed in 6.1.84 with commit ab062fa3dc69 Issue introduced in 4.4 with commit 310d2b4124c0 and fixed in 6.6.24 with commit 122a06f1068b Issue introduced in 4.4 with commit 310d2b4124c0 and fixed in 6.7.12 with commit dbdf66250d2d Issue introduced in 4.4 with commit 310d2b4124c0 and fixed in 6.8.3 with commit 07acf979da33 Issue introduced in 4.4 with commit 310d2b4124c0 and fixed in 6.9-rc2 with commit 80ba43e9f799 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-2024-26934 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/usb/core/sysfs.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/8cbdd324b41528994027128207fae8100dff094f https://git.kernel.org/stable/c/12d6a5681a0a5cecc2af7860f0a1613fa7c6e947 https://git.kernel.org/stable/c/e451709573f8be904a8a72d0775bf114d7c291d9 https://git.kernel.org/stable/c/1b175bc579f46520b11ecda443bcd2ee4904f66a https://git.kernel.org/stable/c/ab062fa3dc69aea88fe62162c5881ba14b50ecc5 https://git.kernel.org/stable/c/122a06f1068bf5e39089863f4f60b1f5d4273384 https://git.kernel.org/stable/c/dbdf66250d2d33e8b27352fcb901de79f3521057 https://git.kernel.org/stable/c/07acf979da33c721357ff27129edf74c23c036c6 https://git.kernel.org/stable/c/80ba43e9f799cbdd83842fc27db667289b3150f5
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