Vulnerability Details : CVE-2020-25641
A flaw was found in the Linux kernel's implementation of biovecs in versions before 5.9-rc7. A zero-length biovec request issued by the block subsystem could cause the kernel to enter an infinite loop, causing a denial of service. This flaw allows a local attacker with basic privileges to issue requests to a block device, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Vulnerability category: Denial of service
Products affected by CVE-2020-25641
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.9.0:-:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.9.0:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.9.0:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.9.0:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.9.0:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.9.0:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:5.9.0:rc6:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
- cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
- cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-25641
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 6 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-25641
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.9
|
MEDIUM | AV:L/AC:L/Au:N/C:N/I:N/A:C |
3.9
|
6.9
|
NIST | |
|
5.5
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
1.8
|
3.6
|
NIST |
CWE ids for CVE-2020-25641
-
The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.Assigned by:
- nvd@nist.gov (Primary)
- secalert@redhat.com (Secondary)
References for CVE-2020-25641
-
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html
[security-announce] openSUSE-SU-2020:1698-1: important: Security updateMailing List;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html
[SECURITY] [DLA 2420-2] linux regression updateMailing List;Third Party Advisory
-
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00021.html
Mailing List;Third Party Advisory
-
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7e24969022cbd61ddc586f14824fc205661bb124
kernel/git/torvalds/linux.git - Linux kernel source treeMailing List;Patch;Vendor Advisory
-
https://usn.ubuntu.com/4576-1/
USN-4576-1: Linux kernel vulnerabilities | Ubuntu security notices | UbuntuThird Party Advisory
-
https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html
[SECURITY] [DLA 2420-1] linux security updateMailing List;Third Party Advisory
-
https://www.kernel.org/doc/html/latest/block/biovecs.html
Immutable biovecs and biovec iterators — The Linux Kernel documentationVendor Advisory
-
http://www.openwall.com/lists/oss-security/2020/10/06/9
oss-security - Re: CVE-2020-25641 kernel: soft lockup when submitting zero length bvecs.Mailing List;Third Party Advisory
-
https://bugzilla.redhat.com/show_bug.cgi?id=1881424
1881424 – (CVE-2020-25641) CVE-2020-25641 kernel: soft-lockups in iov_iter_copy_from_user_atomic() could result in DoSIssue Tracking;Patch;Third Party Advisory
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