CVE-2024-44951High· 7.8▾ TwilightIn 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…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 21.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
0.2% → 0.2%
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.
Linux >= 9879e1bec3c0f077427dd0d258c80c63ce9babdf < 2a0ba376cdf729b5c66226c65c6c7cf9de744d52Linux >= 4409df5866b7ff7686ba27e449ca97a92ee063c9 < 09cfe05e9907f3276887a20e267cc40e202f4fddLinux >= 4409df5866b7ff7686ba27e449ca97a92ee063c9 < 133f4c00b8b2bfcacead9b81e7e8edfceb4b06c4Linux 4b068e55bf5ea7bab4d8a282c6a24b03e80c0b68Linux dbe196ca489f3833e0f9eeb86ac346194f131c91Linux >= 6.6.15 < 6.6.160Linux >= 6.1.76 < 6.2Linux >= 6.7.3 < 6.8Linux 6.8Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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