CVE-2026-43427
usb: class: cdc-wdm: fix reordering issue in read code path
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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
- 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: usb: class: cdc-wdm: fix reordering issue in read code path Quoting the bug report: Due to compiler optimization or CPU out-of-order execution, the desc->length update can be reordered before the memmove. If this happens, wdm_read() can see the new length and call copy_to_user() on uninitialized memory. This also violates LKMM data race rules [1]. Fix it by using WRITE_ONCE and memory barriers.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
Version range not reported
- Linux Linux
2.6.26
References 8
git.kernel.org
- stable/c/638328ca9c17ae6511ad62198c57bae32ffa3c91
- stable/c/170e8daca24da6edb4be82ab01abf44e87af387b
- stable/c/c8fa96ed021923dae147bcd9f9205b8df7b82360
- stable/c/4ee3062bf2c9a722afef429826e8607eaf3fc6a0
- stable/c/276aef0fd2b92f41b920ac891c72cadeee957934
- stable/c/67ed312124bb1b61858778ac0b985b48961c862a
- stable/c/e3c874b05901dc519054b5107d16620e6d2b5fea
- stable/c/8df672bfe3ec2268c2636584202755898e547173