Linux Security
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Mageia 2021-0102: kernel-linus security update

Date 04 Mar 2021
153
Posted By LinuxSecurity Advisories
This kernel-linus update is based on upstream 5.10.19 and fixes atleast the following security issues: 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
MGASA-2021-0102 - Updated kernel-linus packages fix security vulnerabilities

Publication date: 04 Mar 2021
URL: https://advisories.mageia.org/MGASA-2021-0102.html
Type: security
Affected Mageia releases: 8
CVE: CVE-2021-26930,
     CVE-2021-26931,
     CVE-2021-26932

This kernel-linus update is based on upstream 5.10.19 and fixes atleast
the following security issues:

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
(CVE-2021-26930).

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 (CVE-2021-26931).

An issue was discovered in the Linux kernel 3.2 through 5.10.16, as used
by Xen. Grant mapping operations often occur in batch hypercalls, where
a number of operations are done in a single hypercall, the success or
failure of each one is reported to the backend driver, and the backend
driver then loops over the results, performing follow-up actions based
on the success or failure of each operation. Unfortunately, when running
in PV mode, the Linux backend drivers mishandle this: Some errors are
ignored, effectively implying their success from the success of related
batch elements. In other cases, errors resulting from one batch element
lead to further batch elements not being inspected, and hence successful
ones to not be possible to properly unmap upon error recovery. Only
systems with Linux backends running in PV mode are vulnerable. Linux
backends run in HVM / PVH modes are not vulnerable (CVE-2021-26932).

It also adds the following fixes:
- enable ACPI_EC_DEBUGFS (mga#28415)

For other upstream fixes, see the referenced changelogs.

References:
- https://bugs.mageia.org/show_bug.cgi?id=28471
- https://bugs.mageia.org/show_bug.cgi?id=28415
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.17
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.18
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.19
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26930
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26931
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26932

SRPMS:
- 8/core/kernel-linus-5.10.19-1.mga8

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