Vulnerability · Published Sep 10, 2020 · Assigned by mitre
CVE-2020-25221
High 7.8
In plain English
A high-severity security flaw in the linux package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.8High
Exploit odds (30 days)0.7%top 47.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | linux | 5.8.7-1 | DEBIAN-CVE-2020-25221 |
| Debian:13 | linux | 5.8.7-1 | DEBIAN-CVE-2020-25221 |
| Debian:14 | linux | 5.8.7-1 | DEBIAN-CVE-2020-25221 |
Affected products (as reported)
References
- https://www.openwall.com/lists/oss-security/2020/09/08/4 x_refsource_MISC
- https://git.kernel.org/linus/9fa2dd946743ae6f30dc4830da19147bf100a7f2 x_refsource_MISC
- https://git.kernel.org/linus/8891adc61dce2a8a41fc0c23262b681c3ec4b73a x_refsource_MISC
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.7 x_refsource_MISC
- [oss-security] 20200910 Re: CVE Request: Linux kernel vsyscall page refcounting error mailing-list, x_refsource_MLIST
- https://security.netapp.com/advisory/ntap-20201001-0003/ x_refsource_CONFIRM