serial: sc16is7xx: fix TX fifo corruption
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.
CVE-2024-44951
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2024-44951
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "9879e1bec3c0f077427dd0d258c80c63ce9babdf",
"lessThan": "2a0ba376cdf729b5c66226c65c6c7cf9de744d52",
"versionType": "git"
},
{
"status": "affected",
"version": "4409df5866b7ff7686ba27e449ca97a92ee063c9",
"lessThan": "09cfe05e9907f3276887a20e267cc40e202f4fdd",
"versionType": "git"
},
{
"status": "affected",
"version": "4409df5866b7ff7686ba27e449ca97a92ee063c9",
"lessThan": "133f4c00b8b2bfcacead9b81e7e8edfceb4b06c4",
"versionType": "git"
},
{
"status": "affected",
"version": "4b068e55bf5ea7bab4d8a282c6a24b03e80c0b68",
"versionType": "git"
},
{
"status": "affected",
"version": "dbe196ca489f3833e0f9eeb86ac346194f131c91",
"versionType": "git"
},
{
"status": "affected",
"version": "6.6.15",
"lessThan": "6.6.160",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.76",
"lessThan": "6.2",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.7.3",
"lessThan": "6.8",
"versionType": "semver"
}
],
"programFiles": [
"drivers/tty/serial/sc16is7xx.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.8"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.8",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.10.5",
"versionType": "semver",
"lessThanOrEqual": "6.10.*"
},
{
"status": "unaffected",
"version": "6.11",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/tty/serial/sc16is7xx.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2024-44951
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #45900 · Revision 1
- Added to Heist Feed
- Publisher date