Published: 17/02/2021 Updated: 25/03/2024

CVSS v2 Base Score: 1.9 | Impact Score: 2.9 | Exploitability Score: 3.4

CVSS v3 Base Score: 5.5 | Impact Score: 3.6 | Exploitability Score: 1.8

VMScore: 169

Vector: AV:L/AC:M/Au:N/C:N/I:N/A:P

An issue exists in the Linux kernel 2.6.39 up to and including 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.

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linux linux kernel
fedoraproject fedora 32
fedoraproject fedora 33
debian debian linux 9.0

An issue was discovered in the Linux kernel 311 through 51016, 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 ...

A NULL pointer dereference flaw was found in the Linux kernel's GPU Nouveau driver functionality in the way the user calls ioctl DRM_IOCTL_NOUVEAU_CHANNEL_ALLOC This flaw allows a local user to crash the system (CVE-2020-25639) An issue was discovered in the Linux kernel 311 through 51016, as used by Xen To service requests to the PV backend, ...

An issue was discovered in the Linux kernel 311 through 51016, 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 ...

A security issue was found in the Xen module of the Linux kernel 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, like out of memory conditions, it isn't correct to assume so Memory allocations potentially causing such cras ...

Several security issues have been identified that, collectively, may allow privileged code running in a guest VM to cause the host to crash or to become unresponsiveThese issues have the following CVE identifiers: ...

oss-sec mailing list archives   By Date By Thread </form>    Xen Security Advisory 362 v3 (CVE-2021-26931) - Linux: backends treating grant mapping errors as bugs <!--X-Subject-Header-End ...

CWE-770 http://xenbits.xen.org/xsa/advisory-362.html https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html https://security.netapp.com/advisory/ntap-20210326-0001/https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2XQR52ICKRK3GC4HDWLMWF2U55YGAR63/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GWQWPWYZRXVFJI5M3VCM72X27IB7CKOB/https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7c77474b2d22176d2bfb592ec74e0f2cb71352c9 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5a264285ed1cd32e26d9de4f3c8c6855e467fd63 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3194a1746e8aabe86075fd3c5e7cf1f4632d7f16 https://nvd.nist.gov https://alas.aws.amazon.com/ALAS-2021-1487.html

CVE-2021-26931

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