Resource exhaustion in Linux Kernel
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (44.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.000
Affected products
- Linux Kernel
- Debian Linux — versions 9.0
- Fedoraproject Fedora — versions 32, 33
Weakness classification (CWE)
References
- xenbits.xen.org/xsa/advisory-362.html (Patch, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.debian.org/debian-lts-announce/2021/03/msg00010.html (mailing-list, Mailing List, Third Party Advisory)
- security.netapp.com/advisory/ntap-20210326-0001/ (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/03/msg00035.html (mailing-list, Mailing List, Third Party Advisory)
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/
- git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/
Frequently asked questions
- What is CVE-2021-26931?
- CVE-2021-26931 is a medium-severity vulnerability in Linux Kernel, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.5/10. Published 2021-02-17.
- How severe is CVE-2021-26931?
- Medium severity. CVSS v3 base score is 5.5 out of 10.