Buffer overflow in Linux Kernel
CVE-2021-42739
The firewire subsystem in the Linux kernel through 5.14.13 has a buffer overflow related to drivers/media/firewire/firedtv-avc.c and drivers/media/firewire/firedtv-ci.c, because avc_ca_pmt mishandles bounds checking.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (40.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Linux Kernel
- Oracle Communications Cloud Native Core Binding Support Function — versions 22.1.3
- Oracle Communications Cloud Native Core Network Exposure Function — versions 22.1.1
- Oracle Communications Cloud Native Core Policy — versions 22.2.0
- Starwindsoftware Starwind San \& Nas — versions v8r12
- Starwindsoftware Starwind Virtual San — versions v8r13
- Debian Linux — versions 9.0
- Fedoraproject Fedora — versions 33, 34, 35
Weakness classification (CWE)
Public proof-of-concept exploits
References
- lore.kernel.org/linux-media/YHaulytonFcW+lyZ@mwanda/
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/
- seclists.org/oss-sec/2021/q2/46
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Mitigation, Issue Tracking)
- www.oracle.com/security-alerts/cpujul2022.html (Patch, Third Party Advisory)
- www.starwindsoftware.com/security/sw-20220804-0001/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-42739?
- CVE-2021-42739 is a medium-severity vulnerability in Linux Kernel, classified under Out-of-bounds Write. CVSS score: 6.7/10. Published 2021-10-20.
- How severe is CVE-2021-42739?
- Medium severity. CVSS v3 base score is 6.7 out of 10.
- Is CVE-2021-42739 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.