soc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_read
In the Linux kernel, the following vulnerability has been resolved: soc: aspeed: lpc-snoop: Fix usercopy overflow in snoop_file_read put_fifo_with_discard() acts as both producer and consumer on the kfifo: it calls kfifo_skip() (advances out) and kfifo_put() (advances in) from the IRQ handler without synchronizing with snoop_file_read(), which also consumes via kfifo_to_user(). On SMP systems this concurrent access can leave (in - out) larger than the ring buffer, so __kfifo_to_user()'s clamp to (in - out) is ineffective and kfifo_copy_to_user() can attempt a copy_to_user() past the kmalloc-2k backing store: usercopy: Kernel memory exposure attempt detected from SLUB object 'kmalloc-2k' (offset 0, size 2049)! kernel BUG at mm/usercopy.c! Call trace: usercopy_abort __check_heap_object __check_object_size kfifo_copy_to_user __kfifo_to_user snoop_file_read vfs_read Serialize kfifo access with a per-channel spinlock shared between the IRQ handler (producer) and the file reader (consumer). Annotate @fifo with __guarded_by(&lock) and opt the driver into context analysis so the compiler enforces that all fifo access holds the lock.
CVE-2026-74729
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-2026-74729
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": "3772e5da445420543b25825ac2b5971f3743f6e8",
"lessThan": "b87c0d24386ed5106feac12034fe09d893ccb469",
"versionType": "git"
},
{
"status": "affected",
"version": "3772e5da445420543b25825ac2b5971f3743f6e8",
"lessThan": "afe2527eae0b51d5e8ddd77293afab3a5a1311a4",
"versionType": "git"
},
{
"status": "affected",
"version": "3772e5da445420543b25825ac2b5971f3743f6e8",
"lessThan": "868c478abce858135db3eb65548a577e4b6747ac",
"versionType": "git"
},
{
"status": "affected",
"version": "3772e5da445420543b25825ac2b5971f3743f6e8",
"lessThan": "131ab677b03349a5ae48da8722ec7075b37ec66e",
"versionType": "git"
},
{
"status": "affected",
"version": "3772e5da445420543b25825ac2b5971f3743f6e8",
"lessThan": "1acef6d85bfd98bd9dfe1f08bffa397a4dda8a6f",
"versionType": "git"
}
],
"programFiles": [
"drivers/soc/aspeed/Makefile",
"drivers/soc/aspeed/aspeed-lpc-snoop.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/soc/aspeed/Makefile",
"drivers/soc/aspeed/aspeed-lpc-snoop.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74729
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46594 · Revision 1
- Added to Heist Feed
- Publisher date