CVE-2026-23437net: shaper: protect late read accesses to the hierarchy
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 4b623f9f0f59652ea71fcb27d60b4c3b65126dbb before 581eee0890a8bde44f1fb78ad3e70502a897d583; from 4b623f9f0f59652ea71fcb27d60b4c3b65126dbb before 348758ba74e6a348299965b16a97cfb817545cc0; 4b623f9f0f59652ea71fcb27d60b4c3b65126dbb builds before 0f9ea7141f365b4f27226898e62220fb98ef8dc6 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.13.1 before 6.18.20; from 6.19 before 6.19.10; 6.13; 7.0; 7.0; 7.0; 7.0; 7.0; and 2 more ranges | NVD |
References
- https://git.kernel.org/stable/c/581eee0890a8bde44f1fb78ad3e70502a897d583patch
- https://git.kernel.org/stable/c/348758ba74e6a348299965b16a97cfb817545cc0patch
- https://git.kernel.org/stable/c/0f9ea7141f365b4f27226898e62220fb98ef8dc6patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.