greybus: raw: fix use-after-free on cdev close
In the Linux kernel, the following vulnerability has been resolved: greybus: raw: fix use-after-free on cdev close This addresses a use-after-free bug when a raw bundle is disconnected but its chardev is still opened by an application. When the application releases the cdev, it causes the following panic when init on free is enabled (CONFIG_INIT_ON_FREE_DEFAULT_ON=y): refcount_t: underflow; use-after-free. WARNING: CPU: 0 PID: 139 at lib/refcount.c:28 refcount_warn_saturate+0xd0/0x130 ... Call Trace: cdev_put+0x18/0x30 __fput+0x255/0x2a0 __x64_sys_close+0x3d/0x80 do_syscall_64+0xa4/0x290 entry_SYSCALL_64_after_hwframe+0x77/0x7f The cdev is contained in the "gb_raw" structure, which is freed in the disconnect operation. When the cdev is released at a later time, cdev_put gets an address that points to freed memory. To fix this use-after-free, convert the struct device from a pointer to being embedded, that makes the lifetime of the cdev and of this device the same. Then, use cdev_device_add, which guarantees that the device won't be released until all references to the cdev have been released. Finally, delegate the freeing of the structure to the device release function, instead of freeing immediately in the disconnect callback.
CVE-2026-53025
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-2026-53025
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": "e806c7fb8e9bae87fc23958c3789f2c2f96f54a4",
"lessThan": "e4d07fd4e30024a4a15094ef2c404197667c857e",
"versionType": "git"
},
{
"status": "affected",
"version": "e806c7fb8e9bae87fc23958c3789f2c2f96f54a4",
"lessThan": "3abf97a03f4abce1dc3639eea2fcd4bd747b3308",
"versionType": "git"
},
{
"status": "affected",
"version": "e806c7fb8e9bae87fc23958c3789f2c2f96f54a4",
"lessThan": "e72ffe59e48a74a8d9220f5ca1d03f2194d882f0",
"versionType": "git"
},
{
"status": "affected",
"version": "e806c7fb8e9bae87fc23958c3789f2c2f96f54a4",
"lessThan": "ef2d97c15b19b3489de01695bce478601e236c3e",
"versionType": "git"
},
{
"status": "affected",
"version": "e806c7fb8e9bae87fc23958c3789f2c2f96f54a4",
"lessThan": "983cc2c7efbce04ecbf6328448d895044dd6ab31",
"versionType": "git"
}
],
"programFiles": [
"drivers/staging/greybus/raw.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.9",
"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": "7.0.10",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/staging/greybus/raw.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-53025
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #46357 · Revision 1
- Added to Heist Feed
- Publisher date