net_sched: qfq: Fix double list add in class with netem as child qdisc
In the Linux kernel, the following vulnerability has been resolved: net_sched: qfq: Fix double list add in class with netem as child qdisc As described in Gerrard's report [1], there are use cases where a netem child qdisc will make the parent qdisc's enqueue callback reentrant. In the case of qfq, there won't be a UAF, but the code will add the same classifier to the list twice, which will cause memory corruption. This patch checks whether the class was already added to the agg->active list (cl_is_active) before doing the addition to cater for the reentrant case. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/
CVE-2025-37913
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-2025-37913
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": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
"lessThan": "041f410aec2c1751ee22b8b73ba05d38c3a6a602",
"versionType": "git"
},
{
"status": "affected",
"version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
"lessThan": "005a479540478a820c52de098e5e767e63e36f0a",
"versionType": "git"
},
{
"status": "affected",
"version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
"lessThan": "0bf32d6fb1fcbf841bb9945570e0e2a70072c00f",
"versionType": "git"
},
{
"status": "affected",
"version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
"lessThan": "0aa23e0856b7cedb3c88d8e3d281c212c7e4fbeb",
"versionType": "git"
},
{
"status": "affected",
"version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
"lessThan": "a43783119e01849fbf2fe8855634e8989b240cb4",
"versionType": "git"
},
{
"status": "affected",
"version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
"lessThan": "53bc0b55178bd59bdd4bcd16349505cabf54b1a2",
"versionType": "git"
},
{
"status": "affected",
"version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
"lessThan": "370218e8ce711684acc4cdd3cc3c6dd7956bc165",
"versionType": "git"
},
{
"status": "affected",
"version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
"lessThan": "f139f37dcdf34b67f5bf92bc8e0f7f6b3ac63aa4",
"versionType": "git"
}
],
"programFiles": [
"net/sched/sch_qfq.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": "5.4.294",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.238",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.182",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.138",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.90",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.28",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.14.6",
"versionType": "semver",
"lessThanOrEqual": "6.14.*"
},
{
"status": "unaffected",
"version": "6.15",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/sched/sch_qfq.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-37913
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30488 · Revision 1
- Added to Heist Feed
- Publisher date