Vulnerability Details : CVE-2021-26931
An issue was discovered in the Linux kernel 2.6.39 through 5.10.16, as used in Xen. Block, net, and SCSI backends consider certain errors a plain bug, deliberately causing a kernel crash. For errors potentially being at least under the influence of guests (such as out of memory conditions), it isn't correct to assume a plain bug. Memory allocations potentially causing such crashes occur only when Linux is running in PV mode, though. This affects drivers/block/xen-blkback/blkback.c and drivers/xen/xen-scsiback.c.
Products affected by CVE-2021-26931
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-26931
0.03%
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-2021-26931
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
1.9
|
LOW | AV:L/AC:M/Au:N/C:N/I:N/A:P |
3.4
|
2.9
|
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-2021-26931
-
The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-26931
-
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3194a1746e8aabe86075fd3c5e7cf1f4632d7f16
xen-netback: don't "handle" error by BUG() - kernel/git/torvalds/linux.git - Linux kernel source tree
-
https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html
[SECURITY] [DLA 2586-1] linux security updateMailing List;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GWQWPWYZRXVFJI5M3VCM72X27IB7CKOB/
[SECURITY] Fedora 33 Update: kernel-5.10.18-200.fc33 - package-announce - Fedora Mailing-Lists
-
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5a264285ed1cd32e26d9de4f3c8c6855e467fd63
xen-blkback: don't "handle" error by BUG() - kernel/git/torvalds/linux.git - Linux kernel source tree
-
https://security.netapp.com/advisory/ntap-20210326-0001/
February 2021 Linux Kernel Vulnerabilities in NetApp Products | NetApp Product SecurityThird Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GWQWPWYZRXVFJI5M3VCM72X27IB7CKOB/
[SECURITY] Fedora 33 Update: kernel-5.10.18-200.fc33 - package-announce - Fedora Mailing-ListsMailing List;Patch;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2XQR52ICKRK3GC4HDWLMWF2U55YGAR63/
[SECURITY] Fedora 32 Update: kernel-5.10.18-100.fc32 - package-announce - Fedora Mailing-ListsMailing List;Patch;Third Party Advisory
-
http://xenbits.xen.org/xsa/advisory-362.html
XSA-362 - Xen Security AdvisoriesPatch;Third Party Advisory
-
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7c77474b2d22176d2bfb592ec74e0f2cb71352c9
xen-scsiback: don't "handle" error by BUG() - kernel/git/torvalds/linux.git - Linux kernel source tree
-
https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
[SECURITY] [DLA 2610-1] linux-4.19 security updateMailing List;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2XQR52ICKRK3GC4HDWLMWF2U55YGAR63/
[SECURITY] Fedora 32 Update: kernel-5.10.18-100.fc32 - package-announce - Fedora Mailing-Lists
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