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suseSuseOPENSUSE-SU-2021:3876-1
HistoryDec 02, 2021 - 12:00 a.m.

Security update for the Linux Kernel (important)

2021-12-0200:00:00
lists.opensuse.org
20

8.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

7.9 High

CVSS2

Access Vector

ADJACENT_NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:A/AC:M/Au:N/C:C/I:C/A:C

0.004 Low

EPSS

Percentile

72.8%

An update that solves 43 vulnerabilities, contains one
feature and has 26 fixes is now available.

Description:

The SUSE Linux Enterprise 15 SP1 LTSS kernel was updated to receive
various security and bugfixes.

The following security bugs were fixed:

  • Unprivileged BPF has been disabled by default to reduce attack surface
    as too many security issues have happened in the past (jsc#SLE-22573)

    You can reenable via systemctl setting
    /proc/sys/kernel/unprivileged_bpf_disabled to 0.
    (kernel.unprivileged_bpf_disabled = 0)

  • CVE-2021-0941: In bpf_skb_change_head of filter.c, there is a possible
    out of bounds read due to a use after free. This could lead to local
    escalation of privilege with System execution privileges needed. User
    interaction is not needed for exploitation (bnc#1192045).

  • CVE-2021-31916: An out-of-bounds (OOB) memory write flaw was found in
    list_devices in drivers/md/dm-ioctl.c in the Multi-device driver module
    in the Linux kernel A bound check failure allowed an attacker with
    special user (CAP_SYS_ADMIN) privilege to gain access to out-of-bounds
    memory leading to a system crash or a leak of internal kernel
    information. The highest threat from this vulnerability is to system
    availability (bnc#1192781).

  • CVE-2021-20322: Make the ipv4 and ipv6 ICMP exception caches less
    predictive to avoid information leaks about UDP ports in use.
    (bsc#1191790)

  • CVE-2021-34981: Fixed file refcounting in cmtp when cmtp_attach_device
    fails (bsc#1191961).

  • CVE-2021-37159: hso_free_net_device in drivers/net/usb/hso.c in the
    Linux kernel calls unregister_netdev without checking for the
    NETREG_REGISTERED state, leading to a use-after-free and a double free
    (bnc#1188601).

  • CVE-2021-3772: Fixed sctp vtag check in sctp_sf_ootb (bsc#1190351).

  • CVE-2021-3655: Missing size validations on inbound SCTP packets may have
    allowed the kernel to read uninitialized memory (bnc#1188563).

  • CVE-2021-33033: The Linux kernel has a use-after-free in cipso_v4_genopt
    in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for
    the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. This leads to
    writing an arbitrary value (bnc#1186109 bnc#1186390 bnc#1188876).

  • CVE-2021-3760: Fixed a use-after-free vulnerability with the
    ndev->rf_conn_info object (bsc#1190067).

  • CVE-2021-42739: The firewire subsystem in the Linux kernel has a buffer
    overflow related to drivers/media/firewire/firedtv-avc.c and
    drivers/media/firewire/firedtv-ci.c, because avc_ca_pmt mishandled
    bounds checking (bnc#1184673).

  • CVE-2021-3542: Fixed heap buffer overflow in firedtv driver
    (bsc#1186063).

  • CVE-2018-13405: The inode_init_owner function in fs/inode.c in the Linux
    kernel allowed local users to create files with an unintended group
    ownership, in a scenario where a directory is SGID to a certain group
    and is writable by a user who is not a member of that group. Here, the
    non-member can trigger creation of a plain file whose group ownership is
    that group. The intended behavior was that the non-member can trigger
    creation of a directory (but not a plain file) whose group ownership is
    that group. The non-member can escalate privileges by making the plain
    file executable and SGID (bnc#1100416 bnc#1129735).

  • CVE-2021-3715: Fixed a use-after-free in route4_change() in
    net/sched/cls_route.c (bsc#1190349).

  • CVE-2021-34556: 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
    (bnc#1188983).

  • CVE-2021-35477: 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 did not
    necessarily occur before a store operation that has an
    attacker-controlled value (bnc#1188985).

  • CVE-2021-42252: An issue was discovered in aspeed_lpc_ctrl_mmap in
    drivers/soc/aspeed/aspeed-lpc-ctrl.c in the Linux kernel Local attackers
    able to access the Aspeed LPC control interface could overwrite memory
    in the kernel and potentially execute privileges, aka CID-b49a0e69a7b1.
    This occurs because a certain comparison uses values that are not memory
    sizes (bnc#1190479).

  • CVE-2021-41864: prealloc_elems_and_freelist in kernel/bpf/stackmap.c in
    the Linux kernel allowed unprivileged users to trigger an eBPF
    multiplication integer overflow with a resultant out-of-bounds write
    (bnc#1191317).

  • CVE-2021-42008: The decode_data function in drivers/net/hamradio/6pack.c
    in the Linux kernel has a slab out-of-bounds write. Input from a process
    that has the CAP_NET_ADMIN capability can lead to root access
    (bnc#1191315).

  • CVE-2021-3759: Unaccounted ipc objects could have lead to breaking memcg
    limits and DoS attacks (bsc#1190115).

  • CVE-2020-3702: Specifically timed and handcrafted traffic can cause
    internal errors in a WLAN device that lead to improper layer 2 Wi-Fi
    encryption with a consequent possibility of information disclosure over
    the air for a discrete set of traffic (bnc#1191193).

  • CVE-2021-3752: Fixed a use after free vulnerability in the bluetooth
    module. (bsc#1190023)

  • CVE-2021-40490: A race condition was discovered in
    ext4_write_inline_data_end in fs/ext4/inline.c in the ext4 subsystem in
    the Linux kernel (bnc#1190159 bnc#1192775)

  • CVE-2021-3744: Fixed a bug which could allows attackers to cause a
    denial of service. (bsc#1189884)

  • CVE-2021-3764: Fixed a bug which could allows attackers to cause a
    denial of service. (bsc#1190534)

  • CVE-2020-12770: An issue was discovered in the Linux kernel sg_write
    lacks an sg_remove_request call in a certain failure case, aka
    CID-83c6f2390040 (bnc#1171420).

  • CVE-2021-3640: Fixed a Use-After-Free vulnerability in function
    sco_sock_sendmsg() in the bluetooth stack (bsc#1188172).

  • CVE-2019-3900: An infinite loop issue was found in the vhost_net kernel
    module, while handling incoming packets in handle_rx(). It could occur
    if one end sends packets faster than the other end can process them. A
    guest user, maybe remote one, could use this flaw to stall the vhost_net
    kernel thread, resulting in a DoS scenario (bnc#1133374).

  • CVE-2019-3874: The SCTP socket buffer used by a userspace application is
    not accounted by the cgroups subsystem. An attacker can use this flaw to
    cause a denial of service attack. (bnc#1129898).

  • CVE-2018-9517: In pppol2tp_connect, there is possible memory corruption
    due to a use after free. This could lead to local escalation of
    privilege with System execution privileges needed. User interaction is
    not needed for exploitation. (bnc#1108488).

  • CVE-2021-38160: Data corruption or loss could be triggered by an
    untrusted device that supplies a buf->len value exceeding the buffer
    size in drivers/char/virtio_console.c (bsc#1190117)

  • CVE-2021-3753: Fixed race out-of-bounds in virtual terminal handling
    (bsc#1190025).

  • CVE-2021-3732: Mounting overlayfs inside an unprivileged user namespace
    can reveal files (bsc#1189706).

  • CVE-2021-3653: A flaw was found in the KVM’s AMD code for supporting SVM
    nested virtualization. The flaw occurs when processing the VMCB (virtual
    machine control block) provided by the L1 guest to spawn/handle a nested
    guest (L2). Due to improper validation of the “int_ctl” field, this
    issue could allow a malicious L1 to enable AVIC support (Advanced
    Virtual Interrupt Controller) for the L2 guest. As a result, the L2
    guest would be allowed to read/write physical pages of the host,
    resulting in a crash of the entire system, leak of sensitive data or
    potential guest-to-host escape. This flaw affects Linux kernel versions
    prior to 5.14-rc7 (bnc#1189399).

  • CVE-2021-3656: Missing validation of the the virt_ext VMCB field and
    allows a malicious L1 guest to disable both VMLOAD/VMSAVE intercepts and
    VLS for the L2 guest (bsc#1189400).

  • CVE-2021-38204: drivers/usb/host/max3421-hcd.c allowed physically
    proximate attackers to cause a denial of service (use-after-free and
    panic) by removing a MAX-3421 USB device in certain situations
    (bnc#1189291).

  • CVE-2021-3679: A lack of CPU resource in the tracing module
    functionality was found in the way user uses trace ring buffer in a
    specific way. Only privileged local users (with CAP_SYS_ADMIN
    capability) could use this flaw to starve the resources causing denial
    of service (bnc#1189057).

  • CVE-2020-4788: IBM Power9 (AIX 7.1, 7.2, and VIOS 3.1) processors could
    allow a local user to obtain sensitive information from the data in the
    L1 cache under extenuating circumstances. IBM X-Force ID: 189296 (bnc#0
    bnc#1177666 bnc#1181158).

  • CVE-2021-3659: Fixed a NULL pointer dereference in llsec_key_alloc() in
    net/mac802154/llsec.c (bsc#1188876).

  • CVE-2020-0429: In l2tp_session_delete and related functions of
    l2tp_core.c, there is possible memory corruption due to a use after
    free. This could lead to local escalation of privilege with System
    execution privileges needed. User interaction is not needed for
    exploitation (bnc#1176724).

  • CVE-2021-37576: arch/powerpc/kvm/book3s_rtas.c on the powerpc platform
    allowed KVM guest OS users to cause host OS memory corruption via
    rtas_args.nargs, aka CID-f62f3c20647e (bnc#1188838 bnc#1190276).

  • CVE-2021-22543: KVM through Improper handling of VM_IO|VM_PFNMAP vmas in
    KVM can bypass RO checks and can lead to pages being freed while still
    accessible by the VMM and guest. This allowed users with the ability to
    start and control a VM to read/write random pages of memory and can
    result in local privilege escalation (bnc#1186482 bnc#1190276).

  • CVE-2021-33909: fs/seq_file.c did not properly restrict seq buffer
    allocations, leading to an integer overflow, an Out-of-bounds Write, and
    escalation to root by an unprivileged user, aka CID-8cae8cd89f05
    (bnc#1188062 bnc#1188063).

The following non-security bugs were fixed:

  • Add arch-dependent support markers in supported.conf (bsc#1186672)
  • Add the support for kernel-FLAVOR-optional subpackage (jsc#SLE-11796)
  • bpf: Add kconfig knob for disabling unpriv bpf by default (jsc#SLE-22913)
  • bpf: Disallow unprivileged bpf by default (jsc#SLE-22913).
  • ceph: take snap_empty_lock atomically with snaprealm refcount change
    (bsc#1191888).
  • config: disable unprivileged BPF by default (jsc#SLE-22913)
  • cpufreq: intel_pstate: Add Icelake servers support in no-HWP mode
    (bsc#1185758,bsc#1192400).
  • drm: fix spectre issue in vmw_execbuf_ioctl (bsc#1192802).
  • ftrace: Fix scripts/recordmcount.pl due to new binutils (bsc#1192267).
  • gigaset: fix spectre issue in do_data_b3_req (bsc#1192802).
  • hisax: fix spectre issues (bsc#1192802).
  • hv: mana: adjust mana_select_queue to old API (jsc#SLE-18779,
    bsc#1185726).
  • hv: mana: remove netdev_lockdep_set_classes usage (jsc#SLE-18779,
    bsc#1185726).
  • hv_netvsc: Make netvsc/VF binding check both MAC and serial number
    (jsc#SLE-18779, bsc#1185726).
  • hysdn: fix spectre issue in hycapi_send_message (bsc#1192802).
  • infiniband: fix spectre issue in ib_uverbs_write (bsc#1192802).
  • infiniband: fix spectre issue in ib_uverbs_write (bsc#1192802).
  • ipc: remove memcg accounting for sops objects in do_semtimedop()
    (bsc#1190115).
  • iwlwifi: fix spectre issue in iwl_dbgfs_update_pm (bsc#1192802).
  • kernel-binary.spec: Exctract s390 decompression code (jsc#SLE-17042).
  • kernel-binary.spec: Fix up usrmerge for non-modular kernels.
  • kernel-binary.spec.in: build-id check requires elfutils.
  • kernel-binary.spec.in: Regenerate makefile when not using mkmakefile.
  • kernel-binary.spec: Only use mkmakefile when it exists Linux 5.13 no
    longer had a mkmakefile script
  • kernel-binary.spec: Remove obsolete and wrong comment mkmakefile is
    repleced by echo on newer kernel
  • kernel-docs.spec.in: Build using an utf-8 locale. Sphinx cannot handle
    UTF-8 input in non-UTF-8 locale.
  • media: dvb_ca_en50221: prevent using slot_info for Spectre attacs
    (bsc#1192802).
  • media: dvb_ca_en50221: sanity check slot number from userspace
    (bsc#1192802).
  • media: wl128x: get rid of a potential spectre issue (bsc#1192802).
  • memcg: enable accounting for file lock caches (bsc#1190115).
  • mm/memory.c: do_fault: avoid usage of stale vm_area_struct (bsc#1136513).
  • mpt3sas: fix spectre issues (bsc#1192802).
  • net: mana: Add a driver for Microsoft Azure Network Adapter (MANA)
    (jsc#SLE-18779, bsc#1185726).
  • net: mana: Add support for EQ sharing (jsc#SLE-18779, bsc#1185726).
  • net: mana: Add WARN_ON_ONCE in case of CQE read overflow (jsc#SLE-18779,
    bsc#1185726).
  • net: mana: Fix a memory leak in an error handling path in
    (jsc#SLE-18779, bsc#1185726).
  • net: mana: Fix error handling in mana_create_rxq() (git-fixes,
    bsc#1191800).
  • net: mana: fix PCI_HYPERV dependency (jsc#SLE-18779, bsc#1185726).
  • net: mana: Move NAPI from EQ to CQ (jsc#SLE-18779, bsc#1185726).
  • net: mana: Prefer struct_size over open coded arithmetic (jsc#SLE-18779,
    bsc#1185726).
  • net: mana: remove redundant initialization of variable err
    (jsc#SLE-18779, bsc#1185726).
  • net: mana: Use int to check the return value of mana_gd_poll_cq()
    (jsc#SLE-18779, bsc#1185726).
  • net: mana: Use struct_size() in kzalloc() (jsc#SLE-18779, bsc#1185726).
  • net_sched: cls_route: remove the right filter from hashtable
    (networking-stable-20_03_28).
  • net: sched: sch_teql: fix null-pointer dereference (bsc#1190717).
  • net: sock_diag: Fix spectre v1 gadget in __sock_diag_cmd() (bsc#1192802).
  • NFS: Do uncached readdir when we’re seeking a cookie in an empty page
    cache (bsc#1191628).
  • objtool: Do not fail on missing symbol table (bsc#1192379).
  • osst: fix spectre issue in osst_verify_frame (bsc#1192802).
  • ovl: check whiteout in ovl_create_over_whiteout() (bsc#1189846).
  • ovl: filter of trusted xattr results in audit (bsc#1189846).
  • ovl: fix dentry leak in ovl_get_redirect (bsc#1189846).
  • ovl: initialize error in ovl_copy_xattr (bsc#1189846).
  • ovl: relax WARN_ON() on rename to self (bsc#1189846).
  • PCI: hv: Use expected affinity when unmasking IRQ (bsc#1185973).
  • Revert “memcg: enable accounting for file lock caches (bsc#1190115).”
    This reverts commit 912b4421a3e9bb9f0ef1aadc64a436666259bd4d. It’s
    effectively upstream commit 3754707bcc3e190e5dadc978d172b61e809cb3bd
    applied to kernel-source (to avoid proliferation of patches). Make a
    note in blacklist.conf too.
  • s390/bpf: Fix 64-bit subtraction of the -0x80000000 constant
    (bsc#1190601).
  • s390/bpf: Fix branch shortening during codegen pass (bsc#1190601).
  • s390/bpf: Fix optimizing out zero-extensions (bsc#1190601).
  • s390: bpf: implement jitting of BPF_ALU | BPF_ARSH | BPF_* (bsc#1190601).
  • s390/bpf: Wrap JIT macro parameter usages in parentheses (bsc#1190601).
  • scripts/git_sort/git_sort.py: add bpf git repo
  • scripts/git_sort/git_sort.py: Update nvme repositories
  • scsi: libfc: Fix array index out of bound exception (bsc#1188616).
  • scsi: lpfc: Fix FLOGI failure due to accessing a freed node
    (bsc#1191349).
  • scsi: lpfc: Fix memory overwrite during FC-GS I/O abort handling
    (bsc#1191349 bsc#1191457).
  • scsi: lpfc: Keep NDLP reference until after freeing the IOCB after ELS
    handling (bsc#1191349 bsc#1191457).
  • scsi: target: avoid using lun_tg_pt_gp after unlock (bsc#1186078).
  • sctp: check asoc peer.asconf_capable before processing asconf
    (bsc#1190351).
  • sctp: fully initialize v4 addr in some functions (bsc#1188563).
  • sysvipc/sem: mitigate semnum index against spectre v1 (bsc#1192802).
  • target: core: Fix sense key for invalid XCOPY request (bsc#1186078).
  • Update config files: Add CONFIG_BPF_UNPRIV_DEFAULT_OFF is not set
  • Use /usr/lib/modules as module dir when usermerge is active in the
    target distro.
  • UsrMerge the kernel (boo#1184804)
  • x86/CPU: Add more Icelake model numbers (bsc#1185758,bsc#1192400).
  • xfrm: xfrm_state_mtu should return at least 1280 for ipv6 (bsc#1185377).

Special Instructions and Notes:

Please reboot the system after installing this update.

Patch Instructions:

To install this openSUSE Security Update use the SUSE recommended installation methods
like YaST online_update or “zypper patch”.

Alternatively you can run the command listed for your product:

  • openSUSE Leap 15.3:

    zypper in -t patch openSUSE-SLE-15.3-2021-3876=1

8.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

7.9 High

CVSS2

Access Vector

ADJACENT_NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:A/AC:M/Au:N/C:C/I:C/A:C

0.004 Low

EPSS

Percentile

72.8%