CVE-2026-72141i2c: imx: fix locked bus on SMBus block-read of 0 (IRQ)
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: i2c: imx: fix locked bus on SMBus block-read of 0 (IRQ) SMBus 3.1 6.5.7 allows a Block Read byte count of 0, but the interrupt-driven block-read state machine rejects it as -EPROTO. Worse, it returns without a NACK+STOP: the next receive cycle has already started, so the target keeps holding SDA and the bus stays stuck until a power cycle of this i2c controller. Accept count=0: NACK the in-flight dummy byte (TXAK) and set msg->len to 2 so i2c_imx_isr_read_continue() emits STOP via its normal last-byte path. The dummy byte is discarded; block-read callers only consume buf[0..count-1]. Reading I2DR has likewise already armed the next byte on the count > I2C_SMBUS_BLOCK_MAX error path, so NACK it (TXAK) before aborting with -EPROTO; otherwise the failing transfer's STOP cannot complete and the bus stays held. The atomic path regressed earlier (v3.16) and is fixed separately; this patch covers only the v6.13 state-machine rework.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 5f5c2d4579ca6836f5604cca979debd68ecfe23f builds before 5d3240f42a667e29262aff76fdebfcdac4980626; from 5f5c2d4579ca6836f5604cca979debd68ecfe23f before 56ddfc18ea8f7d77747658892873eb632b2ed530; from 5f5c2d4579ca6836f5604cca979debd68ecfe23f before 07fd9385f0d87dff4b34f355f68adf701080cb24 | CNA record |
References
- https://git.kernel.org/stable/c/5d3240f42a667e29262aff76fdebfcdac4980626
- https://git.kernel.org/stable/c/56ddfc18ea8f7d77747658892873eb632b2ed530
- https://git.kernel.org/stable/c/07fd9385f0d87dff4b34f355f68adf701080cb24
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.