cxl/features: Reject Set Features output buffer smaller than the header
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.18.52, 7.2.6
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
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.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From eb5dfcb9e36d0e46089fec777d911313c1876fa3 · fixed in 1281dc84c81577b51e2b61c24617c9f44b2cdb99; From eb5dfcb9e36d0e46089fec777d911313c1876fa3 · fixed in 16b7c99eff030c6ea11ca24efa4b9f989cc74093; From eb5dfcb9e36d0e46089fec777d911313c1876fa3 · fixed in cde18d6c1d913a67ab0afd3d9475ece4be79da50
- Linux Linux
6.15
- KernelLinux
From 6.15.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6