Vulnerability Details : 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.
Vulnerability category: Gain privilege
Exploit prediction scoring system (EPSS) score for CVE-2020-25221
Probability of exploitation activity in the next 30 days: 0.05%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 12 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2020-25221
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
|---|---|---|---|---|---|
|
7.2
|
HIGH | AV:L/AC:L/Au:N/C:C/I:C/A:C |
3.9
|
10.0
|
NIST |
|
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
NIST |
CWE ids for CVE-2020-25221
-
The product uses, accesses, or otherwise operates on a resource after that resource has been expired, released, or revoked.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-25221
-
https://git.kernel.org/linus/9fa2dd946743ae6f30dc4830da19147bf100a7f2
kernel/git/torvalds/linux.git - Linux kernel source treeIssue Tracking;Patch;Vendor Advisory
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https://security.netapp.com/advisory/ntap-20201001-0003/
CVE-2020-25221 Linux Kernel Vulnerability in NetApp Products | NetApp Product SecurityThird Party Advisory
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https://git.kernel.org/linus/8891adc61dce2a8a41fc0c23262b681c3ec4b73a
kernel/git/torvalds/linux.git - Linux kernel source treeIssue Tracking;Patch;Vendor Advisory
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https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.7
Release Notes;Vendor Advisory
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https://www.openwall.com/lists/oss-security/2020/09/08/4
oss-security - CVE Request: Linux kernel vsyscall page refcounting errorMailing List;Patch;Third Party Advisory
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http://www.openwall.com/lists/oss-security/2020/09/10/4
oss-security - Re: CVE Request: Linux kernel vsyscall page refcounting errorMailing List;Third Party Advisory
Products affected by CVE-2020-25221
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
- cpe:2.3:h:netapp:hci_compute_node:-:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:solidfire_\&_hci_management_node:-:*:*:*:*:*:*:*
- cpe:2.3:h:netapp:solidfire_baseboard_management_controller:-:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:solidfire\,_enterprise_sds_\&_hci_storage_node:-:*:*:*:*:*:*:*