MGASA-2021-0397 - Updated kernel packages fix security vulnerabilities

Publication date: 07 Aug 2021
URL: https://advisories.mageia.org/MGASA-2021-0397.html
Type: security
Affected Mageia releases: 8
CVE: CVE-2021-34556,
     CVE-2021-35477

This kernel update is based on upstream 5.10.56 and fixes atleast the
following security issues:

In the Linux kernel through 5.13.7, an unprivileged BPF program can
obtain sensitive information from kernel memory via a Speculative Store
Bypass side-channel attack because the protection mechanism neglects the
possibility of uninitialized memory locations on the BPF stack
(CVE-2021-34556).

In the Linux kernel through 5.13.7, an unprivileged BPF program can
obtain sensitive information from kernel memory via a Speculative Store
Bypass side-channel attack because a certain preempting store operation
does not necessarily occur before a store operation that has an
attacker-controlled value (CVE-2021-35477).

Other fixes in this update:
- btrfs: fix lost inode on log replay after mix of fsync, rename and
  inode eviction
- btrfs: fix race causing unnecessary inode logging during link and rename
- watchdog: iTCO_wdt: Fix detection of SMI-off case (fixes sporadic reboots
  on some systems)
- Revert "ACPICA: Fix memory leak caused by _CID repair function", fixing
  boot failures on some systems
- fix another ACPI issue causing some systems to boot slowly or not at all
  after kernel 5.10.50
- revert: 'scsi: sr: Return appropriate error code when disk is ejected'
  (fixes DVD opening on resume from suspend or standby, mga #29262)
- Revert "usb: renesas-xhci: Fix handling of unknown ROM state"
  (fixes renesas usb pci stopped working, mga #29285)
- Revert "drm/i915: Propagate errors on awaiting already signaled fences"
  and "drm/i915/gem: Asynchronous cmdparser" (fixes an issue where an
  app hang can cause X server to hang)

For other upstream fixes, see the referenced changelogs.

References:
- https://bugs.mageia.org/show_bug.cgi?id=29311
- https://bugs.mageia.org/show_bug.cgi?id=29262
- https://bugs.mageia.org/show_bug.cgi?id=29285
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.53
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.54
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.55
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.56
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-34556
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-35477

SRPMS:
- 8/core/kernel-5.10.56-1.mga8
- 8/core/kmod-virtualbox-6.1.24-1.4.mga8
- 8/core/kmod-xtables-addons-3.18-1.16.mga8