CVE-2021-26931 — Allocation of Resources Without Limits or Throttling in Kernel

CWE-770 — Allocation of Resources Without Limits or ThrottlingCWE-476 — NULL Pointer Dereference18 documents7 sources
Severity
6.5MEDIUMNVD
NVD5.5OSV7.8OSV6.7OSV5.5OSV4.4
EPSS
0.1%
top 77.79%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
20
Linux KernelDebian LinuxDebian Linux+17 more
Timeline
PublishedFeb 17
Latest updateMay 1

Description

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/xe…

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitability: 1.8 | Impact: 3.6

Affected Packages20 packages

▶NVDlinux/linux_kernel2.6.39 — 4.4.260+8
▶Debianlinux/linux_kernel< 5.10.24-1+7
▶Ubuntulinux/linux_kernel< 4.4.0-208.240+2

Also affects: Debian Linux 9.0, Fedora 32, 33

Patches

Patch: xenbits.xen.org ↗Patch: xenbits.xen.org ↗

🔴Vulnerability Details

8
GHSA
GHSA-j7vw-r676-53wr: An issue was discovered in the Linux kernel through 5↗2022-05-24
▶
GHSA
GHSA-rmvc-9pcc-7qpx: An issue was discovered in the Linux kernel 2↗2022-05-24
▶
OSV
linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oracle, linux-raspi vulnerabilities↗2021-05-11
▶
OSV
linux, linux-aws, lnux-aws-hwe, linux-azure, inux-azure-4.15, linux-dell300x, linux-gcp, linux-hwe, linux-gcp-4.15, linux-kvm, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities↗2021-05-11
▶
OSV
linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-ra↗2021-04-13
▶

📋Vendor Advisories

8
Red Hat
kernel: scsi: qla2xxx: Fix command flush on cable pull↗2024-05-01
▶
Ubuntu
Linux kernel vulnerabilities↗2021-05-11
▶
Ubuntu
Linux kernel vulnerabilities↗2021-05-11
▶
Ubuntu
Linux kernel vulnerabilities↗2021-04-13
▶
Ubuntu
Linux kernel vulnerabilities↗2021-04-13
▶