CVE-2021-47153

i2c: i801: Don't generate an interrupt on bus reset

HIGH

7.1

CVSS Score

Published: March 25, 2024 at 09:07 AM UTC

Updated: August 5, 2026 at 09:24 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.1

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

3.6 ≤ v < 4.14.2353.6 ≤ v < 4.19.1933.6 ≤ v < 4.4.2713.6 ≤ v < 4.9.2713.6 ≤ v < 5.10.423.6 ≤ v < 5.12.93.6 ≤ v < 5.133.6 ≤ v < 5.4.1244.10 ≤ v < 4.14.2354.15 ≤ v < 4.19.1934.20 ≤ v < 5.4.1244.5 ≤ v < 4.9.2715.11 ≤ v < 5.12.95.5 ≤ v < 5.10.425.13 rc1 5.13 rc2 5.13 rc3636752bcb5177a301d0266270661581de8624828

Vendor states this is fixed in 04cc05e3716ae31b17ecdab7bc55c8170def1b8b (fixed)

Vendor states this is fixed in 09c9e79f4c10cfb6b9e0e1b4dd355232e4b5a3b3 (fixed)

Vendor states this is fixed in 1f583d3813f204449037cd2acbfc09168171362a (fixed)

Vendor states this is fixed in b523feb7e8e44652f92f3babb953a976e7ccbbef (fixed)

Vendor states this is fixed in c70e1ba2e7e65255a0ce004f531dd90dada97a8c (fixed)

Vendor states this is fixed in dfa8929e117b0228a7765f5c3f5988a4a028f3c6 (fixed)

Vendor states this is fixed in e4d8716c3dcec47f1557024add24e1f3c09eb24b (fixed)

Vendor states this is fixed in f9469082126cebb7337db3992d143f5e4edfe629 (fixed)

Vendor states this is fixed in 3.6 (unaffected)

Vendor states this is fixed in 4.14.235 (unaffected)

Vendor states this is fixed in 4.19.193 (unaffected)

Vendor states this is fixed in 4.4.271 (unaffected)