Debian Long Term Support / LTS Security Information / 2022 / Security Information -- DLA-2940-1 linux

Debian Security Advisory

DLA-2940-1 linux -- LTS security update

Date Reported:

09 Mar 2022

Affected Packages:

linux

Vulnerable:

Yes

Security database references:

In the Debian bugtracking system: Bug 990411.
In Mitre's CVE dictionary: CVE-2021-3640, CVE-2021-3752, CVE-2021-4002, CVE-2021-4083, CVE-2021-4155, CVE-2021-4202, CVE-2021-28711, CVE-2021-28712, CVE-2021-28713, CVE-2021-28714, CVE-2021-28715, CVE-2021-29264, CVE-2021-33033, CVE-2021-39685, CVE-2021-39686, CVE-2021-39698, CVE-2021-39714, CVE-2021-43976, CVE-2021-45095, CVE-2022-0001, CVE-2022-0002, CVE-2022-0330, CVE-2022-0435, CVE-2022-0487, CVE-2022-0492, CVE-2022-0617, CVE-2022-24448, CVE-2022-25258, CVE-2022-25375.

More information:

Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

• CVE-2021-3640

  LinMa of BlockSec Team discovered a race condition in the Bluetooth SCO implementation that can lead to a use-after-free. A local user could exploit this to cause a denial of service (memory corruption or crash) or possibly for privilege escalation.

• CVE-2021-3752

  Likang Luo of NSFOCUS Security Team discovered a flaw in the Bluetooth L2CAP implementation that can lead to a user-after-free. A local user could exploit this to cause a denial of service (memory corruption or crash) or possibly for privilege escalation.

• CVE-2021-4002

  It was discovered that hugetlbfs, the virtual filesystem used by applications to allocate huge pages in RAM, did not flush the CPU's TLB in one case where it was necessary. In some circumstances a local user would be able to read and write huge pages after they are freed and reallocated to a different process. This could lead to privilege escalation, denial of service or information leaks.

• CVE-2021-4083

  Jann Horn reported a race condition in the local (Unix) sockets garbage collector, that can lead to use-after-free. A local user could exploit this to cause a denial of service (memory corruption or crash) or possibly for privilege escalation.

• CVE-2021-4155

  Kirill Tkhai discovered a data leak in the way the XFS_IOC_ALLOCSP IOCTL in the XFS filesystem allowed for a size increase of files with unaligned size. A local attacker can take advantage of this flaw to leak data on the XFS filesystem.

• CVE-2021-4202

  Lin Ma discovered a race condition in the NCI (NFC Controller Interface) driver, which could lead to a use-after-free. A local user could exploit this to cause a denial of service (memory corruption or crash) or possibly for privilege escalation.

  This protocol is not enabled in Debian's official kernel configurations.

• CVE-2021-28711

  , CVE-2021-28712, CVE-2021-28713 (XSA-391)

  Juergen Gross reported that malicious PV backends can cause a denial of service to guests being serviced by those backends via high frequency events, even if those backends are running in a less privileged environment.

• CVE-2021-28714

  , CVE-2021-28715 (XSA-392)

  Juergen Gross discovered that Xen guests can force the Linux netback driver to hog large amounts of kernel memory, resulting in denial of service.

• CVE-2021-29264

  It was discovered that the gianfar Ethernet driver used with some Freescale SoCs did not correctly handle a Rx queue overrun when jumbo packets were enabled. On systems using this driver and jumbo packets, an attacker on the network could exploit this to cause a denial of service (crash).

  This driver is not enabled in Debian's official kernel configurations.

• CVE-2021-33033

  The syzbot tool found a reference counting bug in the CIPSO implementation that can lead to a use-after-free.

  This protocol is not enabled in Debian's official kernel configurations.

• CVE-2021-39685

  Szymon Heidrich discovered a buffer overflow vulnerability in the USB gadget subsystem, resulting in information disclosure, denial of service or privilege escalation.

• CVE-2021-39686

  A race condition was discovered in the Android binder driver, that could lead to incorrect security checks. On systems where the binder driver is loaded, a local user could exploit this for privilege escalation.

  This driver is not enabled in Debian's official kernel configurations.

• CVE-2021-39698

  Linus Torvalds reported a flaw in the file polling implementation, which could lead to a use-after-free. A local user could exploit this for denial of service (memory corruption or crash) or possibly for privilege escalation.

• CVE-2021-39714

  A potential reference count overflow was found in the Android Ion driver. On systems where the Ion driver is loaded, a local user could exploit this for denial of service (memory corruption or crash) or possibly for privilege escalation.

  This driver is not enabled in Debian's official kernel configurations.

• CVE-2021-43976

  Zekun Shen and Brendan Dolan-Gavitt discovered a flaw in the mwifiex_usb_recv() function of the Marvell WiFi-Ex USB Driver. An attacker able to connect a crafted USB device can take advantage of this flaw to cause a denial of service.

• CVE-2021-45095

  It was discovered that the Phone Network protocol (PhoNet) driver has a reference count leak in the pep_sock_accept() function.

• CVE-2022-0001

  (INTEL-SA-00598)

  Researchers at VUSec discovered that the Branch History Buffer in Intel processors can be exploited to create information side channels with speculative execution. This issue is similar to Spectre variant 2, but requires additional mitigations on some processors.

  This can be exploited to obtain sensitive information from a different security context, such as from user-space to the kernel, or from a KVM guest to the kernel.

• CVE-2022-0002

  (INTEL-SA-00598)

  This is a similar issue to CVE-2022-0001, but covers exploitation within a security context, such as from JIT-compiled code in a sandbox to hosting code in the same process.

  This can be partly mitigated by disabling eBPF for unprivileged users with the sysctl: kernel.unprivileged_bpf_disabled=2. This update does that by default.

• CVE-2022-0330

  Sushma Venkatesh Reddy discovered a missing GPU TLB flush in the i915 driver, resulting in denial of service or privilege escalation.

• CVE-2022-0435

  Samuel Page and Eric Dumazet reported a stack overflow in the networking module for the Transparent Inter-Process Communication (TIPC) protocol, resulting in denial of service or potentially the execution of arbitrary code.

• CVE-2022-0487

  A use-after-free was discovered in the MOXART SD/MMC Host Controller support driver. This flaw does not impact the Debian binary packages as CONFIG_MMC_MOXART is not set.

• CVE-2022-0492

  Yiqi Sun and Kevin Wang reported that the cgroup-v1 subsystem does not properly restrict access to the release-agent feature. A local user can take advantage of this flaw for privilege escalation and bypass of namespace isolation.

• CVE-2022-0617

  butt3rflyh4ck discovered a NULL pointer dereference in the UDF filesystem. A local user that can mount a specially crafted UDF image can use this flaw to crash the system.

• CVE-2022-24448

  Lyu Tao reported a flaw in the NFS implementation in the Linux kernel when handling requests to open a directory on a regular file, which could result in a information leak.

• CVE-2022-25258

  Szymon Heidrich reported the USB Gadget subsystem lacks certain validation of interface OS descriptor requests, resulting in memory corruption.

• CVE-2022-25375

  Szymon Heidrich reported that the RNDIS USB gadget lacks validation of the size of the RNDIS_MSG_SET command, resulting in information leak from kernel memory.

For Debian 9 stretch, these problems have been fixed in version 4.9.303-1. This update additionally includes many more bug fixes from stable updates 4.9.291-4.9.303 inclusive.

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/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