net: sched: act_ife: initialize struct tc_ife to fix KMSAN kernel-infoleak
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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: net: sched: act_ife: initialize struct tc_ife to fix KMSAN kernel-infoleak Fix a KMSAN kernel-infoleak detected by the syzbot . [net?] KMSAN: kernel-infoleak in __skb_datagram_iter In tcf_ife_dump(), the variable 'opt' was partially initialized using a designatied initializer. While the padding bytes are reamined uninitialized. nla_put() copies the entire structure into a netlink message, these uninitialized bytes leaked to userspace. Initialize the structure with memset before assigning its fields to ensure all members and padding are cleared prior to beign copied. This change silences the KMSAN report and prevents potential information leaks from the kernel memory. This fix has been tested and validated by syzbot. This patch closes the bug reported at the following syzkaller link and ensures no infoleak.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
Version range not reported
- Linux Linux
4.6
References 8
git.kernel.org
- stable/c/918e063304f945fb93be9bb70cacea07d0b730ea
- stable/c/5e3644ef147bf7140259dfa4cace680c9b26fe8b
- stable/c/37f0680887c5aeba9a433fe04b35169010568bb1
- stable/c/2191662058443e0bcc28d11694293d8339af6dde
- stable/c/a676a296af65d33725bdf7396803180957dbd92e
- stable/c/d1dbbbe839647486c9b893e5011fe84a052962df
- stable/c/c8f51dad94cbb88054e2aacc272b3ce1ed11fb1e
- stable/c/ce50039be49eea9b4cd8873ca6eccded1b4a130a