This bug was fixed in the package linux - 5.4.0-21.25

---------------
linux (5.4.0-21.25) focal; urgency=medium

  * CVE-2020-8835
    - SAUCE: bpf: undo incorrect __reg_bound_offset32 handling

 -- Thadeu Lima de Souza Cascardo <casca...@canonical.com>  Thu, 26 Mar
2020 17:51:28 -0300

** Changed in: linux (Ubuntu Focal)
       Status: Confirmed => Fix Released

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-8835

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https://bugs.launchpad.net/bugs/1867903

Title:
  Focal update: v5.4.26 upstream stable release

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Focal:
  Fix Released

Bug description:
  
      SRU Justification

      Impact:
         The upstream process for stable tree updates is quite similar
         in scope to the Ubuntu SRU process, e.g., each patch has to
         demonstrably fix a bug, and each patch is vetted by upstream
         by originating either directly from a mainline/stable Linux tree or
         a minimally backported form of that patch. The following upstream
         stable patches should be included in the Ubuntu kernel:

         v5.4.26 upstream stable release
         from git://git.kernel.org/

              
  Linux 5.4.26
  net/smc: cancel event worker during device removal
  net/smc: check for valid ib_client_data
  ipv6: restrict IPV6_ADDRFORM operation
  iommu/amd: Fix IOMMU AVIC not properly update the is_run bit in IRTE
  i2c: acpi: put device when verifying client fails
  iommu/vt-d: Ignore devices with out-of-spec domain number
  iommu/vt-d: Fix the wrong printing in RHSA parsing
  netfilter: nft_chain_nat: inet family is missing module ownership
  netfilter: nf_tables: dump NFTA_CHAIN_FLAGS attribute
  netfilter: nft_tunnel: add missing attribute validation for tunnels
  netfilter: nft_payload: add missing attribute validation for payload csum 
flags
  netfilter: cthelper: add missing attribute validation for cthelper
  perf bench futex-wake: Restore thread count default to online CPU count
  nl80211: add missing attribute validation for channel switch
  nl80211: add missing attribute validation for beacon report scanning
  nl80211: add missing attribute validation for critical protocol indication
  i2c: gpio: suppress error on probe defer
  iommu/vt-d: Fix RCU-list bugs in intel_iommu_init()
  driver code: clarify and fix platform device DMA mask allocation
  drm/i915/gvt: Fix unnecessary schedule timer when no vGPU exits
  pinctrl: core: Remove extra kref_get which blocks hogs being freed
  drm/i915/gvt: Fix dma-buf display blur issue on CFL
  virtio_ring: Fix mem leak with vring_new_virtqueue()
  pinctrl: imx: scu: Align imx sc msg structs to 4
  pinctrl: meson-gxl: fix GPIOX sdio pins
  clk: imx8mn: Fix incorrect clock defines
  batman-adv: Don't schedule OGM for disabled interface
  iommu/vt-d: Fix a bug in intel_iommu_iova_to_phys() for huge page
  iommu/vt-d: Fix RCU list debugging warnings
  iommu/vt-d: dmar: replace WARN_TAINT with pr_warn + add_taint
  iommu/dma: Fix MSI reservation allocation
  x86/mce: Fix logic and comments around MSR_PPIN_CTL
  perf/amd/uncore: Replace manual sampling check with CAP_NO_INTERRUPT flag
  mt76: fix array overflow on receiving too many fragments for a packet
  i2c: designware-pci: Fix BUG_ON during device removal
  efi: Add a sanity check to efivar_store_raw()
  efi: Fix a race and a buffer overflow while reading efivars via sysfs
  x86/ioremap: Map EFI runtime services data as encrypted for SEV
  macintosh: windfarm: fix MODINFO regression
  fscrypt: don't evict dirty inodes after removing key
  blk-iocost: fix incorrect vtime comparison in iocg_is_idle()
  ipmi_si: Avoid spurious errors for optional IRQs
  s390/dasd: fix data corruption for thin provisioned devices
  fuse: fix stack use after return
  ARC: define __ALIGN_STR and __ALIGN symbols for ARC
  KVM: nVMX: avoid NULL pointer dereference with incorrect EVMCS GPAs
  KVM: x86: clear stale x86_emulate_ctxt->intercept value
  gfs2_atomic_open(): fix O_EXCL|O_CREAT handling on cold dcache
  cifs_atomic_open(): fix double-put on late allocation failure
  ktest: Add timeout for ssh sync testing
  pinctrl: falcon: fix syntax error
  mmc: sdhci-pci-gli: Enable MSI interrupt for GL975x
  drm/i915: Defer semaphore priority bumping to a workqueue
  drm/i915: be more solid in checking the alignment
  drm/amd/display: remove duplicated assignment to grph_obj_type
  workqueue: don't use wq_select_unbound_cpu() for bound works
  netfilter: x_tables: xt_mttg_seq_next should increase position index
  netfilter: xt_recent: recent_seq_next should increase position index
  netfilter: synproxy: synproxy_cpu_seq_next should increase position index
  netfilter: nf_conntrack: ct_cpu_seq_next should increase position index
  iommu/vt-d: quirk_ioat_snb_local_iommu: replace WARN_TAINT with pr_warn + 
add_taint
  virtio-blk: fix hw_queue stopped on arbitrary error
  iwlwifi: mvm: Do not require PHY_SKU NVM section for 3168 devices
  netfilter: nf_tables: fix infinite loop when expr is not available
  cgroup: Iterate tasks that did not finish do_exit()
  cgroup: cgroup_procs_next should increase position index
  net: phy: Avoid multiple suspends
  net: dsa: Don't instantiate phylink for CPU/DSA ports unless needed
  selftests/net/fib_tests: update addr_metric_test for peer route testing
  net/ipv6: remove the old peer route if change it to a new one
  net/ipv6: need update peer route when modify metric
  net: phy: fix MDIO bus PM PHY resuming
  net: phy: avoid clearing PHY interrupts twice in irq handler
  nfc: add missing attribute validation for vendor subcommand
  nfc: add missing attribute validation for deactivate target
  nfc: add missing attribute validation for SE API
  tipc: add missing attribute validation for MTU property
  team: add missing attribute validation for array index
  team: add missing attribute validation for port ifindex
  net: taprio: add missing attribute validation for txtime delay
  net: fq: add missing attribute validation for orphan mask
  macsec: add missing attribute validation for port
  can: add missing attribute validation for termination
  nl802154: add missing attribute validation for dev_type
  nl802154: add missing attribute validation
  fib: add missing attribute validation for tun_id
  devlink: validate length of region addr/len
  devlink: validate length of param values
  net: memcg: fix lockdep splat in inet_csk_accept()
  net: memcg: late association of sock to memcg
  cgroup: memcg: net: do not associate sock with unrelated cgroup
  bnxt_en: fix error handling when flashing from file
  bnxt_en: reinitialize IRQs when MTU is modified
  bonding/alb: make sure arp header is pulled before accessing it
  taprio: Fix sending packets without dequeueing them
  slip: make slhc_compress() more robust against malicious packets
  sfc: detach from cb_page in efx_copy_channel()
  r8152: check disconnect status after long sleep
  net: systemport: fix index check to avoid an array out of bounds access
  net: stmmac: dwmac1000: Disable ACS if enhanced descs are not used
  net: phy: bcm63xx: fix OOPS due to missing driver name
  net/packet: tpacket_rcv: do not increment ring index on drop
  net: nfc: fix bounds checking bugs on "pipe"
  net: macsec: update SCI upon MAC address change.
  netlink: Use netlink header as base to calculate bad attribute offset
  net/ipv6: use configured metric when add peer route
  net: hns3: fix a not link up issue when fibre port supports autoneg
  net: fec: validate the new settings in fec_enet_set_coalesce()
  net: dsa: mv88e6xxx: fix lockup on warm boot
  net: dsa: fix phylink_start()/phylink_stop() calls
  macvlan: add cond_resched() during multicast processing
  ipvlan: don't deref eth hdr before checking it's set
  ipvlan: do not use cond_resched_rcu() in ipvlan_process_multicast()
  ipvlan: do not add hardware address of master to its unicast filter list
  ipvlan: add cond_resched_rcu() while processing muticast backlog
  ipv6/addrconf: call ipv6_mc_up() for non-Ethernet interface
  inet_diag: return classid for all socket types
  gre: fix uninit-value in __iptunnel_pull_header
  cgroup, netclassid: periodically release file_lock on classid updating
  ALSA: hda/realtek - Fixed one of HP ALC671 platform Headset Mic supported
  ALSA: hda/realtek - Add Headset Mic supported for HP cPC
  ALSA: hda/realtek - More constifications
  virtio_balloon: Adjust label in virtballoon_probe

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