Vulnerability in af_packet handling

[Khaled El Mously]

CVE-2021-22600

A vulnerability, which was classified as critical, was found in Linux Kernel. Affected is the function packet_set_ring of the file net/packet/af_packet.c. The manipulation with an unknown input leads to a memory corruption vulnerability. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was released 01/26/2022. The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2021-22600 since 01/05/2021. The exploitability is told to be easy. It is possible to launch the attack remotely. A authentication is required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 01/26/2022).

Applying a patch is able to eliminate this problem. The fix is https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=ec6af094ea28f0f2dda1a6a33b14cd57e36a9755

More information at: https://partnerissuetracker.corp.google.com/issues/215427453

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-gke/5.4.0-1061.64 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-focal' to 'verification-done-focal'. If the problem still exists, change the tag 'verification-needed-focal' to 'verification-failed-focal'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-gke - 5.4.0-1061.64

---------------
linux-gke (5.4.0-1061.64) focal; urgency=medium

  * focal/linux-gke: 5.4.0-1061.64 -proposed tracker (LP: #1959355)

  * Vulnerability in af_packet handling (LP: #1959173)
    - net/packet: rx_owner_map depends on pg_vec

linux-gke (5.4.0-1060.63) focal; urgency=medium

  * focal/linux-gke: 5.4.0-1060.63 -proposed tracker (LP: #1955227)

  [ Ubuntu: 5.4.0-97.110 ]

  * icmp_redirect from selftests fails on F/kvm (unary operator expected)
    (LP: #1938964)
    - selftests: icmp_redirect: pass xfail=0 to log_test()
  * Focal: CIFS stable updates (LP: #1954926)
    - cifs: use the expiry output of dns_query to schedule next resolution
    - cifs: set a minimum of 120s for next dns resolution
    - cifs: To match file servers, make sure the server hostname matches
  * seccomp_bpf in seccomp from ubuntu_kernel_selftests failed to build on B-5.4
    (LP: #1896420)
    - SAUCE: selftests/seccomp: fix "storage size of 'md' isn't known" build issue
    - SAUCE: selftests/seccomp: Fix s390x regs not defined issue
  * system crash when removing ipmi_msghandler module (LP: #1950666)
    - ipmi: Move remove_work to dedicated workqueue
    - ipmi: msghandler: Make symbol 'remove_work_wq' static
  * zcrypt DD: Toleration for new IBM Z Crypto Hardware - (Backport to Ubuntu
    20.04) (LP: #1954680)
    - s390/AP: support new dynamic AP bus size limit
  * [UBUNTU 20.04] KVM hardware diagnose data improvements for guest kernel -
    kernel part (LP: #1953334)
    - s390/setup: diag 318: refactor struct
    - s390/kvm: diagnose 0x318 sync and reset
    - KVM: s390: remove diag318 reset code
    - KVM: s390: add debug statement for diag 318 CPNC data
  * Updates to ib_peer_memory requested by Nvidia (LP: #1947206)
    - SAUCE: RDMA/core: Updated ib_peer_memory
  * Include Infiniband Peer Memory interface (LP: #1923104)
    - IB: Allow calls to ib_umem_get from kernel ULPs
    - SAUCE: RDMA/core: Introduce peer memory interface
  * Focal update: v5.4.162 upstream stable release (LP: #1954834)
    - arm64: zynqmp: Do not duplicate flash partition label property
    - arm64: zynqmp: Fix serial compatible string
    - ARM: dts: NSP: Fix mpcore, mmc node names
    - scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq()
    - arm64: dts: hisilicon: fix arm,sp805 compatible string
    - RDMA/bnxt_re: Check if the vlan is valid before reporting
    - usb: musb: tusb6010: check return value after calling
      platform_get_resource()
    - usb: typec: tipd: Remove WARN_ON in tps6598x_block_read
    - arm64: dts: qcom: msm8998: Fix CPU/L2 idle state latency and residency
    - arm64: dts: freescale: fix arm,sp805 compatible string
    - ASoC: SOF: Intel: hda-dai: fix potential locking issue
    - clk: imx: imx6ul: Move csi_sel mux to correct base register
    - ASoC: nau8824: Add DMI quirk mechanism for active-high jack-detect
    - scsi: advansys: Fix kernel pointer leak
    - firmware_loader: fix pre-allocated buf built-in firmware use
    - ARM: dts: omap: fix gpmc,mux-add-data type
    - usb: host: ohci-tmio: check return value after calling
      platform_get_resource()
    - ARM: dts:...