CVE-2021-47361
mcb: fix error handling in mcb_alloc_bus()
- 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
In the Linux kernel, the following vulnerability has been resolved: mcb: fix error handling in mcb_alloc_bus() There are two bugs: 1) If ida_simple_get() fails then this code calls put_device(carrier) but we haven't yet called get_device(carrier) and probably that leads to a use after free. 2) After device_initialize() then we need to use put_device() to release the bus. This will free the internal resources tied to the device and call mcb_free_bus() which will free the rest.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
Version range not reported
- Linux Linux
4.7
References 7
git.kernel.org
- stable/c/8a558261fa57a6deefb0925ab1829f698b194aea
- stable/c/115b07d9f47e3996430b8f2007edd9768e1f807f
- stable/c/66f74ba9be9daf9c47fface6af3677f602774f6b
- stable/c/7751f609eadf36b1f53712bae430019c53a16eb0
- stable/c/91e4ad05bf18322b5921d1a6c9b603f6eb1694f0
- stable/c/9fc198f415dee070a1de957bb5bf5921d8df3499
- stable/c/25a1433216489de4abc889910f744e952cb6dbae