Use After Free in Linux Kernel
CVE-2022-47939
An issue was discovered in ksmbd in the Linux kernel 5.15 through 5.19 before 5.19.2. fs/ksmbd/smb2pdu.c has a use-after-free and OOPS for SMB2_TREE_DISCONNECT.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.474 (98.8th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.464 · newest: 0.474 · change: +0.010
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19.2 (Patch, Mailing List, Vendor Advisory)
- github.com/torvalds/linux/commit/cf6531d98190fa2cf92a6d8bbc8af0a4740a223c (Patch, Third Party Advisory)
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Mailing List, Vendor Advisory)
- www.openwall.com/lists/oss-security/2022/12/23/10 (Mailing List, Third Party Advisory)
- www.zerodayinitiative.com/advisories/ZDI-22-1690/ (VDB Entry, Third Party Advisory)
- www.secpod.com/blog/zero-day-server-message-block-smb-server-in-linux-kernel-5-… (Third Party Advisory)
Frequently asked questions
- What is CVE-2022-47939?
- CVE-2022-47939 is a critical-severity vulnerability in Linux Kernel, classified under Use After Free. CVSS score: 9.8/10. Published 2022-12-23.
- How severe is CVE-2022-47939?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2022-47939 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.