net_sched: red: fix a race in __red_change()
In the Linux kernel, the following vulnerability has been resolved: net_sched: red: fix a race in __red_change() Gerrard Tai reported a race condition in RED, whenever SFQ perturb timer fires at the wrong time. The race is as follows: CPU 0 CPU 1 [1]: lock root [2]: qdisc_tree_flush_backlog() [3]: unlock root | | [5]: lock root | [6]: rehash | [7]: qdisc_tree_reduce_backlog() | [4]: qdisc_put() This can be abused to underflow a parent's qlen. Calling qdisc_purge_queue() instead of qdisc_tree_flush_backlog() should fix the race, because all packets will be purged from the qdisc before releasing the lock.
CVE-2025-38108
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-2025-38108
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": "0c8d13ac96070000da33f394f45e9c19638483c5",
"lessThan": "2790c4ec481be45a80948d059cd7c9a06bc37493",
"versionType": "git"
},
{
"status": "affected",
"version": "0c8d13ac96070000da33f394f45e9c19638483c5",
"lessThan": "a1bf6a4e9264a685b0e642994031f9c5aad72414",
"versionType": "git"
},
{
"status": "affected",
"version": "0c8d13ac96070000da33f394f45e9c19638483c5",
"lessThan": "110a47efcf23438ff8d31dbd9c854fae2a48bf98",
"versionType": "git"
},
{
"status": "affected",
"version": "0c8d13ac96070000da33f394f45e9c19638483c5",
"lessThan": "f569984417a4e12c67366e69bdcb752970de921d",
"versionType": "git"
},
{
"status": "affected",
"version": "0c8d13ac96070000da33f394f45e9c19638483c5",
"lessThan": "2a71924ca4af59ffc00f0444732b6cd54b153d0e",
"versionType": "git"
},
{
"status": "affected",
"version": "0c8d13ac96070000da33f394f45e9c19638483c5",
"lessThan": "4b755305b2b0618e857fdadb499365b5f2e478d1",
"versionType": "git"
},
{
"status": "affected",
"version": "0c8d13ac96070000da33f394f45e9c19638483c5",
"lessThan": "444ad445df5496a785705019268a8a84b84484bb",
"versionType": "git"
},
{
"status": "affected",
"version": "0c8d13ac96070000da33f394f45e9c19638483c5",
"lessThan": "85a3e0ede38450ea3053b8c45d28cf55208409b8",
"versionType": "git"
}
],
"programFiles": [
"net/sched/sch_red.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.0"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.295",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.239",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.186",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.142",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.94",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.34",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.15.3",
"versionType": "semver",
"lessThanOrEqual": "6.15.*"
},
{
"status": "unaffected",
"version": "6.16",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/sched/sch_red.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-38108
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30520 · Revision 1
- Added to Heist Feed
- Publisher date