CVE-2024-44951serial: sc16is7xx: fix TX fifo corruption
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: serial: sc16is7xx: fix TX fifo corruption Sometimes, when a packet is received on channel A at almost the same time as a packet is about to be transmitted on channel B, we observe with a logic analyzer that the received packet on channel A is transmitted on channel B. In other words, the Tx buffer data on channel B is corrupted with data from channel A. The problem appeared since commit 4409df5866b7 ("serial: sc16is7xx: change EFR lock to operate on each channels"), which changed the EFR locking to operate on each channel instead of chip-wise. This commit has introduced a regression, because the EFR lock is used not only to protect the EFR registers access, but also, in a very obscure and undocumented way, to protect access to the data buffer, which is shared by the Tx and Rx handlers, but also by each channel of the IC. Fix this regression first by switching to kfifo_out_linear_ptr() in sc16is7xx_handle_tx() to eliminate the need for a shared Rx/Tx buffer. Secondly, replace the chip-wise Rx buffer with a separate Rx buffer for each channel.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
- Modified
- Record last updated
- Oct 21, 2026
- First seen by InfoSec Signals
- Oct 21, 2026
Affected products
Linux Linux linux:linux (from the name) | 9879e1bec3c0f077427dd0d258c80c63ce9babdf builds before 2a0ba376cdf729b5c66226c65c6c7cf9de744d52; 4409df5866b7ff7686ba27e449ca97a92ee063c9 builds before 09cfe05e9907f3276887a20e267cc40e202f4fdd; 4409df5866b7ff7686ba27e449ca97a92ee063c9 builds before 133f4c00b8b2bfcacead9b81e7e8edfceb4b06c4; 4b068e55bf5ea7bab4d8a282c6a24b03e80c0b68; dbe196ca489f3833e0f9eeb86ac346194f131c91; from 6.6.15 before 6.6.160; from 6.1.76 before 6.2; from 6.7.3 before 6.8 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.1.76 before 6.2; from 6.6.15 before 6.7; from 6.7.3 before 6.8; from 6.8 before 6.10.5; 6.11; 6.11 | NVD |
References
- https://git.kernel.org/stable/c/2a0ba376cdf729b5c66226c65c6c7cf9de744d52
- https://git.kernel.org/stable/c/09cfe05e9907f3276887a20e267cc40e202f4fddpatch
- https://git.kernel.org/stable/c/133f4c00b8b2bfcacead9b81e7e8edfceb4b06c4patch
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.