Vulnerability Details : CVE-2021-26930
An issue was discovered in the Linux kernel 3.11 through 5.10.16, as used by Xen. To service requests to the PV backend, the driver maps grant references provided by the frontend. In this process, errors may be encountered. In one case, an error encountered earlier might be discarded by later processing, resulting in the caller assuming successful mapping, and hence subsequent operations trying to access space that wasn't mapped. In another case, internal state would be insufficiently updated, preventing safe recovery from the error. This affects drivers/block/xen-blkback/blkback.c.
Products affected by CVE-2021-26930
- 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-2021-26930
0.09%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 27 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-26930
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.6
|
MEDIUM | AV:L/AC:L/Au:N/C:P/I:P/A:P |
3.9
|
6.4
|
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 |
References for CVE-2021-26930
-
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://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
-
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=871997bc9e423f05c7da7c9178e62dde5df2a7f8
xen-blkback: fix error handling in xen_blkbk_map() - kernel/git/torvalds/linux.git - Linux kernel source tree
-
http://xenbits.xen.org/xsa/advisory-365.html
XSA-365 - Xen Security AdvisoriesPatch;Third Party Advisory
-
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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