Linux Security
Linux Security
Linux Security

Mageia 2021-0175: kernel-linus security update

Date 03 Apr 2021
249
Posted By LinuxSecurity Advisories
This kernel-linus update is based on upstream 5.10.27 and fixes atleast the following security issues: The fix for XSA-365 includes initialization of pointers such that subsequent cleanup code wouldn't use uninitialized or stale values.
MGASA-2021-0175 - Updated kernel-linus packages fix security vulnerabilities

Publication date: 03 Apr 2021
URL: https://advisories.mageia.org/MGASA-2021-0175.html
Type: security
Affected Mageia releases: 7, 8
CVE: CVE-2021-28688,
     CVE-2021-28951,
     CVE-2021-28964,
     CVE-2021-28971,
     CVE-2021-28972,
     CVE-2021-29266

This kernel-linus update is based on upstream 5.10.27 and fixes atleast
the following security issues:

The fix for XSA-365 includes initialization of pointers such that
subsequent cleanup code wouldn't use uninitialized or stale values.
This initialization went too far and may under certain conditions also
overwrite pointers which are in need of cleaning up. The lack of
cleanup would result in leaking persistent grants. The leak in turn
would prevent fully cleaning up after a respective guest has died,
leaving around zombie domains. A malicious or buggy frontend driver
may be able to cause resource leaks from the corresponding backend
driver. This can result in a host-wide Denial of Sevice (DoS).
(CVE-2021-28688 / XSA-371).

An issue was discovered in fs/io_uring.c in the Linux kernel through
5.11.8. It allows attackers to cause a denial of service (deadlock)
because exit may be waiting to park a SQPOLL thread, but concurrently
that SQPOLL thread is waiting for a signal to start (CVE-2021-28951).

A race condition was discovered in get_old_root in fs/btrfs/ctree.c in
the Linux kernel through 5.11.8. It allows attackers to cause a denial
of service (BUG) because of a lack of locking on an extent buffer 
before a cloning operation (CVE-2021-28964).

In intel_pmu_drain_pebs_nhm in arch/x86/events/intel/ds.c in the Linux
kernel through 5.11.8 on some Haswell CPUs, userspace applications (such
as perf-fuzzer) can cause a system crash because the PEBS status in a
PEBS record is mishandled (CVE-2021-28971).

In drivers/pci/hotplug/rpadlpar_sysfs.c in the Linux kernel through 5.11.8,
the RPA PCI Hotplug driver has a user-tolerable buffer overflow when
writing a new device name to the driver from userspace, allowing userspace
to write data to the kernel stack frame directly. This occurs because
add_slot_store and remove_slot_store mishandle drc_name '\0' termination
(CVE-2021-28972).

An issue was discovered in the Linux kernel before 5.11.9. drivers/vhost/
vdpa.c has a use-after-free because v->config_ctx has an invalid value
upon re-opening a character device (CVE-2021-29266).

It also adds the following fixes:
- arm: enable OF_OVERLAY (mga#28596)

For other upstream fixes, see the referenced changelogs.

References:
- https://bugs.mageia.org/show_bug.cgi?id=28691
- https://bugs.mageia.org/show_bug.cgi?id=28596
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.26
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.27
- https://xenbits.xen.org/xsa/advisory-371.html
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28688
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28951
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28964
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28971
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28972
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-29266

SRPMS:
- 7/core/kernel-linus-5.10.27-1.mga7
- 8/core/kernel-linus-5.10.27-1.mga8

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