net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter The sch_cake ACK filter parses packets to find the TCP header and filter duplicated ACKs if the flow is backlogged. The parsing code contains a WARN_ON(1) which can be triggered by a malformed IP header in certain cases. Depending on the system configuration, this leads either to either spamming dmesg with warnings, or a panic if panic_on_warn is set. The code already correctly skips the offending packet in the branch that triggers the warning, so the WARN_ON itself doesn't really serve any purpose. So just drop it altogether to avoid the inconvenient side effects.
CVE-2026-74704
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-2026-74704
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": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
"lessThan": "c1693b7844a6c06d31a565e5a494948034dfd235",
"versionType": "git"
},
{
"status": "affected",
"version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
"lessThan": "a4b52612004a5639c4bfc30ba93ba414b8326e2a",
"versionType": "git"
},
{
"status": "affected",
"version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
"lessThan": "ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3",
"versionType": "git"
},
{
"status": "affected",
"version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
"lessThan": "0c4882bff34558d8d53fb04c3e96da5c327c7dc8",
"versionType": "git"
},
{
"status": "affected",
"version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
"lessThan": "2504a76e5c0694e14e15562730e1339f2d9f9458",
"versionType": "git"
},
{
"status": "affected",
"version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
"lessThan": "cd2f1d9fe8a507c2dc86ad326fe221f121c47734",
"versionType": "git"
},
{
"status": "affected",
"version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
"lessThan": "a1ae353d8355407c1bea971d1c1af5e7f242bb7d",
"versionType": "git"
},
{
"status": "affected",
"version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
"lessThan": "2a33516f9ef59ad11844d4fc152f889449b5daf3",
"versionType": "git"
}
],
"programFiles": [
"net/sched/sch_cake.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": "5.10.265",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.152",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.104",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.45",
"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": [
"net/sched/sch_cake.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74704
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #34276 · Revision 1
- Added to Heist Feed
- Publisher date