Debian LTS: DLA-3131-1: linux security update
Summary
Several vulnerabilities have been discovered in the Linux kernel that
may lead to privilege escalation, denial of service or information
leaks.
CVE-2021-4159
A flaw was found in the eBPF verifier which could lead to an
out-of-bounds read. If unprivileged use of eBPF is enabled, this
could leak sensitive information. This was already disabled by
default, which would fully mitigate the vulnerability.
CVE-2021-33655
A user with access to a framebuffer console device could cause a
memory out-of-bounds write via the FBIOPUT_VSCREENINFO ioctl.
CVE-2021-33656
A user with access to a framebuffer console device could cause a
memory out-of-bounds write via some font setting ioctls. These
obsolete ioctls have been removed.
CVE-2022-1462
一只狗 reported a race condition in the pty (pseudo-terminal)
subsystem that can lead to a slab out-of-bounds write. A local
user could exploit this to cause a denial of service (crash or
memory corruption) or possibly for privilege escalation.
CVE-2022-1679
The syzbot tool found a race condition in the ath9k_htc driver
which can lead to a use-after-free. This might be exploitable to
cause a denial service (crash or memory corruption) or possibly
for privilege escalation.
CVE-2022-2153
"kangel" reported a flaw in the KVM implementation for x86
processors which could lead to a null pointer dereference. A local
user permitted to access /dev/kvm could exploit this to cause a
denial of service (crash).
CVE-2022-2318
A use-after-free in the Amateur Radio X.25 PLP (Rose) support may
result in denial of service.
CVE-2022-2586
A use-after-free in the Netfilter subsystem may result in local
privilege escalation for a user with the CAP_NET_ADMIN capability
in any user or network namespace.
CVE-2022-2588
Zhenpeng Lin discovered a use-after-free flaw in the cls_route
filter implementation which may result in local privilege
escalation for a user with the CAP_NET_ADMIN capability in any
user or network namespace.
CVE-2022-2663
David Leadbeater reported flaws in the nf_conntrack_irc
connection-tracking protocol module. When this module is enabled
on a firewall, an external user on the same IRC network as an
internal user could exploit its lax parsing to open arbitrary TCP
ports in the firewall, to reveal their public IP address, or to
block their IRC connection at the firewall.
CVE-2022-3028
Abhishek Shah reported a race condition in the AF_KEY subsystem,
which could lead to an out-of-bounds write or read. A local user
could exploit this to cause a denial of service (crash or memory
corruption), to obtain sensitive information, or possibly for
privilege escalation.
CVE-2022-26365, CVE-2022-33740, CVE-2022-33741, CVE-2022-33742
Roger Pau Monne discovered that Xen block and network PV device
frontends don't zero out memory regions before sharing them with
the backend, which may result in information disclosure.
Additionally it was discovered that the granularity of the grant
table doesn't permit sharing less than a 4k page, which may also
result in information disclosure.
CVE-2022-26373
It was discovered that on certain processors with Intel's Enhanced
Indirect Branch Restricted Speculation (eIBRS) capabilities there
are exceptions to the documented properties in some situations,
which may result in information disclosure.
Intel's explanation of the issue can be found at
https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/advisory-guidance/post-barrier-return-stack-buffer-predictions.html
CVE-2022-33744
Oleksandr Tyshchenko discovered that ARM Xen guests can cause a
denial of service to the Dom0 via paravirtual devices.
CVE-2022-36879
A flaw was discovered in xfrm_expand_policies in the xfrm
subsystem which can cause a reference count to be dropped twice.
CVE-2022-36946
Domingo Dirutigliano and Nicola Guerrera reported a memory
corruption flaw in the Netfilter subsystem which may result in
denial of service.
CVE-2022-39188
Jann Horn reported a race condition in the kernel's handling of
unmapping of certain memory ranges. When a driver created a
memory mapping with the VM_PFNMAP flag, which many GPU drivers do,
the memory mapping could be removed and freed before it was
flushed from the CPU TLBs. This could result in a page use-after- free. A local user with access to such a device could exploit
this to cause a denial of service (crash or memory corruption) or
possibly for privilege escalation.
CVE-2022-39842
An integer overflow was discovered in the pxa3xx-gcu video driver
which could lead to a heap out-of-bounds write.
This driver is not enabled in Debian's official kernel
configurations.
CVE-2022-40307
A race condition was discovered in the EFI capsule-loader driver,
which could lead to use-after-free. A local user permitted to
access this device (/dev/efi_capsule_loader) could exploit this to
cause a denial of service (crash or memory corruption) or possibly
for privilege escalation. However, this device is normally only
accessible by the root user.
For Debian 10 buster, these problems have been fixed in version
4.19.260-1.
We recommend that you upgrade your linux packages.
For the detailed security status of linux please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/linux
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
