Vulnerability in Linux Kernel
CVE-2020-25221
get_gate_page in mm/gup.c in the Linux kernel 5.7.x and 5.8.x before 5.8.7 allows privilege escalation because of incorrect reference counting (caused by gate page mishandling) of the struct page that backs the vsyscall page. The result is a refcount underflow. This can be triggered by any 64-bit process that can use ptrace() or process_vm_readv(), aka CID-9fa2dd946743.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (50.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.openwall.com/lists/oss-security/2020/09/08/4 (Patch, Mailing List, Third Party Advisory)
- git.kernel.org/linus/9fa2dd946743ae6f30dc4830da19147bf100a7f2 (Patch, Issue Tracking, Vendor Advisory)
- git.kernel.org/linus/8891adc61dce2a8a41fc0c23262b681c3ec4b73a (Patch, Issue Tracking, Vendor Advisory)
- cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.7 (Release Notes, Vendor Advisory)
- www.openwall.com/lists/oss-security/2020/09/10/4 (mailing-list, Mailing List, Third Party Advisory)
- security.netapp.com/advisory/ntap-20201001-0003/ (Third Party Advisory)
Frequently asked questions
- What is CVE-2020-25221?
- CVE-2020-25221 is a high-severity vulnerability in Linux Kernel, classified under Operation on a Resource after Expiration or Release. CVSS score: 7.8/10. Published 2020-09-10.
- How severe is CVE-2020-25221?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2020-25221 known to be exploited?
- 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.