Answer in brief
CVE-2026-23437 records a High severity (CVSS 7.8) vulnerability in net: shaper: protect late read accesses to the hierarchy. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=4b623f9f0f59652ea71fcb27d60b4c3b65126dbb <581eee0890a8bde44f1fb78ad3e70502a897d583 || >=4b623f9f0f59652ea71fcb27d60b4c3b65126dbb <348758ba74e6a348299965b16a97cfb817545cc0 || >=4b623f9f0f59652ea71fcb27d60b4c3b65126dbb <0f9ea7141f365b4f27226898e62220fb98ef8dc6 | 581eee0890a8bde44f1fb78ad3e70502a897d583, 348758ba74e6a348299965b16a97cfb817545cc0, 0f9ea7141f365b4f27226898e62220fb98ef8dc6 |
| Linux/Linuxgeneric | 6.13 | Not reported |
Published upstream
Apr 3, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 16, 2026
In the Linux kernel, the following vulnerability has been resolved: net: shaper: protect late read accesses to the hierarchy We look up a netdev during prep of Netlink ops (pre- callbacks) and take a ref to it. Then later in the body of the callback we take its lock or RCU which are the actual protections. This is not proper, a conversion from a ref to a locked netdev must include a liveness check (a check if the netdev hasn't been unregistered already). Fix the read cases (those under RCU). Writes needs a separate change to protect from creating the hierarchy after flush has already run.
Quoted source text, attributed separately from HOL analysis.