Use-after-free in Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component
A use-after-free vulnerability in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component can be exploited to achieve local privilege escalation. If a class with a link-sharing curve (i.e. with the HFSC_FSC flag set) has a parent without a link-sharing curve, then init_vf() will call vttree_insert() on the parent, but vttree_remove() will be skipped in update_vf(). This leaves a dangling pointer that can cause a use-after-free. We recommend upgrading past commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f.
CVE-2023-4623
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-2023-4623
Kernel
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
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org",
"vendor": "Linux",
"product": "Kernel",
"versions": [
{
"status": "affected",
"version": "2.6.12",
"lessThan": "6.6",
"versionType": "custom"
}
],
"packageName": "kernel",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2023-4623
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #24277 · Revision 1
- Added to Heist Feed
- Publisher date