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Date: Mon, 25 Mar 2024 10:08:10 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2021-47153: i2c: i801: Don't generate an interrupt on bus reset Description =========== In the Linux kernel, the following vulnerability has been resolved: i2c: i801: Don't generate an interrupt on bus reset Now that the i2c-i801 driver supports interrupts, setting the KILL bit in a attempt to recover from a timed out transaction triggers an interrupt. Unfortunately, the interrupt handler (i801_isr) is not prepared for this situation and will try to process the interrupt as if it was signaling the end of a successful transaction. In the case of a block transaction, this can result in an out-of-range memory access. This condition was reproduced several times by syzbot: https://syzkaller.appspot.com/bug?extid=ed71512d469895b5b34e https://syzkaller.appspot.com/bug?extid=8c8dedc0ba9e03f6c79e https://syzkaller.appspot.com/bug?extid=c8ff0b6d6c73d81b610e https://syzkaller.appspot.com/bug?extid=33f6c360821c399d69eb https://syzkaller.appspot.com/bug?extid=be15dc0b1933f04b043a https://syzkaller.appspot.com/bug?extid=b4d3fd1dfd53e90afd79 So disable interrupts while trying to reset the bus. Interrupts will be enabled again for the following transaction. The Linux kernel CVE team has assigned CVE-2021-47153 to this issue. Affected and fixed versions =========================== Issue introduced in 3.6 with commit 636752bcb517 and fixed in 4.4.271 with commit f9469082126c Issue introduced in 3.6 with commit 636752bcb517 and fixed in 4.9.271 with commit 09c9e79f4c10 Issue introduced in 3.6 with commit 636752bcb517 and fixed in 4.14.235 with commit dfa8929e117b Issue introduced in 3.6 with commit 636752bcb517 and fixed in 4.19.193 with commit c70e1ba2e7e6 Issue introduced in 3.6 with commit 636752bcb517 and fixed in 5.4.124 with commit 04cc05e3716a Issue introduced in 3.6 with commit 636752bcb517 and fixed in 5.10.42 with commit b523feb7e8e4 Issue introduced in 3.6 with commit 636752bcb517 and fixed in 5.12.9 with commit 1f583d3813f2 Issue introduced in 3.6 with commit 636752bcb517 and fixed in 5.13 with commit e4d8716c3dce 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-2021-47153 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/busses/i2c-i801.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/f9469082126cebb7337db3992d143f5e4edfe629 https://git.kernel.org/stable/c/09c9e79f4c10cfb6b9e0e1b4dd355232e4b5a3b3 https://git.kernel.org/stable/c/dfa8929e117b0228a7765f5c3f5988a4a028f3c6 https://git.kernel.org/stable/c/c70e1ba2e7e65255a0ce004f531dd90dada97a8c https://git.kernel.org/stable/c/04cc05e3716ae31b17ecdab7bc55c8170def1b8b https://git.kernel.org/stable/c/b523feb7e8e44652f92f3babb953a976e7ccbbef https://git.kernel.org/stable/c/1f583d3813f204449037cd2acbfc09168171362a https://git.kernel.org/stable/c/e4d8716c3dcec47f1557024add24e1f3c09eb24b
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