CVE-2026-93078cxl/features: Reject Set Features output buffer smaller than the header
Updated under an hour ago ()
Does this affect you?
It affects Linux. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
In the Linux kernel, the following vulnerability has been resolved: cxl/features: Reject Set Features output buffer smaller than the header cxlctl_set_feature() sizes its output buffer from the user's fwctl_rpc.out_len but never checks it is large enough to hold even the fwctl_rpc_cxl_out header. With out_len == 0 , kvzalloc() returns ZERO_SIZE_PTR, which passes the !rpc_out check, the subsequent rpc_out->size = 0 then writes through the poison pointer. Reject requests whose output buffer can't hold the response header, before allocating. The Set Feature reply carries no payload, so the header is all that is required.
- CVSS
- Not yet scored
- 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
- Received
- Record last updated
- Sep 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from eb5dfcb9e36d0e46089fec777d911313c1876fa3 before 1281dc84c81577b51e2b61c24617c9f44b2cdb99; from eb5dfcb9e36d0e46089fec777d911313c1876fa3 before 16b7c99eff030c6ea11ca24efa4b9f989cc74093; from eb5dfcb9e36d0e46089fec777d911313c1876fa3 before cde18d6c1d913a67ab0afd3d9475ece4be79da50 | CNA record |
References
- https://git.kernel.org/stable/c/1281dc84c81577b51e2b61c24617c9f44b2cdb99
- https://git.kernel.org/stable/c/16b7c99eff030c6ea11ca24efa4b9f989cc74093
- https://git.kernel.org/stable/c/cde18d6c1d913a67ab0afd3d9475ece4be79da50
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.