readykernel-patch-64.7-81.0-1.vl7

Kernel Update Version:
3.10.0-862.11.6.vz7.64.7
Release Date:
2019-06-13 10:00:02
  • VSTOR-22575

    OOM killer would kill tasks from cgroups without memory guarantees first.

    If the amount of free memory is low, OOM killer would kill the tasks from cgroups without memory guarantees first. However, it seems more reasonable to kill the tasks from cgroups exceeding their guarantees the most.
  • PSBM-92312

    virtio_scsi: a race condition in the Linux block layer could cause certain I/O requests to hang.

  • PSBM-94270

    ploop: kernel crash in ploop_congested().

  • PSBM-93988

    ext4: inode tables created during online resize were not zeroed.

    It was discovered that inode tables created during online resize of an ext4 filesystem were not zeroed after that. This could potentially result in lower performance of the filesystem.
  • PSBM-94429

    Windows Server 2016 Essentials failed to install into a QEMU VM with disabled PMU.

    It was found that if no PMU counters were exposed to guest, KVM skipped the whole remaining PMU-related initialization, including filling of LBR-related data. As it turned out, Windows Server 2016 Essentials tried to access these data during the installation and failed to install as a result.
  • PSBM-94727

    ploop: 'pcompact' could hang if run simultaneously with 'ploop-balloon status'

  • PSBM-94535

    Memory leak in the implementation of IPv4 routing.

    It was discovered that a certain sequence of operations related to IPv4 routing could trigger a kernel memory leak. An attacker could potentially exploit that from a container to cause a denial of service.
  • CVE-2019-6974

    KVM: potential use-after-free via kvm_ioctl_create_device().

    A use-after-free vulnerability was found in the way KVM implements its device control API. When a device is created via kvm_ioctl_create_device(), it holds a reference to a VM object. This reference is transferred to file descriptor table of the caller. If such file descriptor was closed, reference count to the VM object could become zero, which could lead to a use-after-free issue. A user/process could use this flaw to crash the guest VM resulting in a denial of service or, potentially, gain privileged access to a system.
    https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-6974
  • CVE-2019-7221

    KVM: use-after-free in the emulation of the preemption timer for the L2 guest systems.

    A use-after-free vulnerability was found in the way KVM emulates a preemption timer for L2 guests when nested virtualization is enabled. A guest user/process could use this flaw to crash the host kernel resulting in a denial of service or, potentially, gain privileged access to a system.
    https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-7221
  • PSBM-88251

    System hang (hard lockup) due to an infinite loop in calc_load_ve().

    If some process held the CPU cgroup of a container while the container was being stopped, the kernel would try to add this cgroup to the list of such structures again when the container was started the next time. This would corrupt the list, and calc_load_ve() function would go in an endless loop as a result.
  • PSBM-93349

    ploop: potential data corruption due to a race between 'prepare_merge' and 'submit_alloc' operations.

  • PSBM-93713

    High order page allocations were made in neigh_probe() in certain cases.

  • PSBM-93672

    High order page allocations were triggered by CRIU while restoring TCP sockets.

  • VSTOR-21390

    Network performance issues due to the usage of pfmemalloc reserves.

    It was discovered that network drivers could allocate memory for the socket buffers from pfmemalloc memory reserves, even when it was unnecessary. As a result, the network packets were dropped by sk_filter_trim_cap() causing performance issues.
  • PSBM-93052

    skb drops due to the usage of pfmemalloc reserves were difficult to debug.

    Additional diagnostics was introduced to make it easier to detect and analyze skb drops due to the usage of pfmemalloc reserves.
  • PSBM-93016

    KVM did not update CPUID bits OSXSAVE and OSPKE in some cases.

    It was discovered that CPUID bits OSXSAVE and OSPKE were not updated properly by KVM when the guest system rebooted. As a result, the guest system could crash.
  • PSBM-92132

    The per-container limit on the network interfaces was too low for Docker in some cases.

    It was discovered that Docker running inside a Virtuozzo container could hit the limit on the network interfaces (256) when it tried to start 50+ its containers. This fix allows changing that limit for the running containers and increases the default limit to 1024.
  • PSBM-92064

    txqueuelen could not be changed via SIOCSIFTXQLEN ioctl on the host.

  • PSBM-91819

    Kernel crash in ext4_clear_inode().

  • PSBM-91566

    A large tarball with a lot of small files can fail to unpack inside a container if kmem limit is set.

    It was found that unpacking a large tarball with a lot of small files could fail inside a container. This could happen because kmem limit was hit prematurely, while reclaimable memory was still available.
  • PSBM-91598

    sr_mod: kernel crash in sr_block_revalidate_disk().

  • PSBM-91794

    overlayfs: kernel crash in may_open().

    CVE-2019-10140. An attacker with local access can create a denial of service situation via NULL pointer dereference in ovl_posix_acl_create(). The ovl_create() function can return a positive number leading to a null pointer derference of path in may_open(). This can allow attackers with ability to create directories on overlayfs to crash the kernel creating a Denial Of Service (DOS).
  • PSBM-91042

    Links to certain files in /proc/ inside containers were not validated.

    It was discovered that a malicious user inside a Virtuozzo container could potentially overwrite "vzctl" binary on the host. The attacker could replace executables in that container with symlinks to /proc/self/exe. After that, "vzctl exec" called from the host to run one of such executables would try to run the host's "vzctl" there instead. If the attacker managed to intercept that, they would be able to change the contents of the host's "vzctl" binary. The issue is similar to CVE-2019-5736, but affects "vzctl" rather than "runc".
    https://virtuozzosupport.force.com/s/article/000017636
  • PSBM-91361

    Kernel crash (BUG_ON) ploop_relocblks_ioc().

  • PSBM-91032

    /proc/sys/net/core/somaxconn was not available in the containers.

  • CVE-2018-18397

    userfaultfd bypasses tmpfs file permissions.

    A flaw was found in the implementation of userfaultfd. An attacker is able to bypass file permissions on filesystems mounted with tmpfs/hugetlbs to modify a file and possibly disrupt normal system behaviour. At this time there is an understanding there is no crash or priviledge escalation but the impact of modifications on these filesystems of files in production systems may have adverse affects.
    https://bugzilla.redhat.com/show_bug.cgi?id=1641548
  • PSBM-91527

    ipvs: an unneeded debug message is output when a network namespace is initialized.

    Debug message 'IPVS: Creating netns size=... id=...' could be output many times to the system log when the network namespaces are initialized, making the log less readable.
  • PSBM-91181

    'perf record -a' causes segfaults in applications executing vsyscalls.

  • PSBM-90803

    Some operations with ebtables could consume large amounts of memory, resulting in DoS.

    A flaw was found in the implementation of ebtables in the Linux kernel. A local attacker in a container could exploit it to consume large amounts of memory, eventually causing denial of service on the host.
  • PSBM-90329

    Kernel crash (access out of bounds) in SyS_mincore().

  • PSBM-90291

    vhost: kernel crash (access out of bounds) in memcpy_fromiovecend().

  • PSBM-89403

    tcache was not shrunk in some situations.

  • CVE-2018-16884

    NFS: use-after-free in svc_process_common().

    A flaw was found in the implementation of NFS v4.1 in the Linux kernel. NFS v4.1 shares mounted in different network namespaces at the same time can make bc_svc_process() use wrong back-channel id and cause a use-after-free. A malicious user in a container can exploit this to cause a host kernel memory corruption and a system crash.
    https://bugzilla.redhat.com/show_bug.cgi?id=1660375
  • CVE-2018-9568

    Memory corruption due to incorrect socket cloning.

    Transforming an IPv6-socket to an IPv4, and then transforming it back to a listening socket could result in a kernel memory corruption. An unprivileged user on the host or in a container could exploit this to crash the kernel.
    https://bugzilla.redhat.com/show_bug.cgi?id=1655904
  • CVE-2018-14646

    NULL pointer dereference in af_netlink.c: __netlink_ns_capable() allows for denial of service.

    The Linux kernel was found to be vulnerable to a NULL pointer dereference bug in the __netlink_ns_capable() function in the net/netlink/af_netlink.c file. A local attacker could exploit this when a net namespace with a netnsid is assigned to cause a kernel panic and a denial of service.
    https://bugzilla.redhat.com/show_bug.cgi?id=1630124
  • PSBM-90052

    Asynchronous discard requests could fail with EIO because ploop did not properly align them.

  • PSBM-90024

    Some operations with NFS server running in a container could crash the host kernel.

    It was discovered that a special sequence of operations involving NFS server in a container with FEATURES="nfsd=on" could crash the host kernel.
  • PSBM-89856

    Data corruption after online resize of an empty ploop image located on Virtuozzo Storage.

  • CVE-2018-16862

    cleancache: missing invalidation of an inode could cause data corruption.

  • PSBM-89583

    Errors in the implementation of online resize in ext4 caused failures of ploop resize operations.

  • PSBM-89323

    Potential kernel crash in cbt_flush_cpu_cache().

  • PSBM-89725

    Ploop: integer overflow in the implementation of direct IO could lead to errors when resizing the ploop image.

  • PSBM-89520

    Incorrect accounting of network namespaces in the error paths in copy_net_ns().

  • PSBM-89717

    Use-after-free in the implementation of the shared memory.

    A flaw was found in the implementation of the shared memory in the Linux kernel. shm_mmap() function did not always check if the underlying file structures were valid, which could lead to use-after-free. A local unprivileged user could exploit this to crash the kernel by executing a special sequence of system calls.
  • CVE-2018-18559

    Use-after-free due to race condition in AF_PACKET implementation.

    It was discovered that a race condition between packet_do_bind() and packet_notifier() in the implementation of AF_PACKET could lead to use-after-free. An unprivileged user on the host or in a container could exploit this to crash the kernel or, potentially, to escalate their privileges in the system.
    https://bugzilla.redhat.com/show_bug.cgi?id=1641878
  • PSBM-88809

    Potential kernel crash in ext4_close_pfcache().

  • CVE-2018-14634

    Integer overflow in create_elf_tables() function.

    An integer overflow flaw was found in create_elf_tables(). An unprivileged local user with access to SUID (or otherwise privileged) binary could use this flaw to escalate their privileges on the system.
    https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14634
  • CVE-2017-1000365

    Bypass of the size restriction on the arguments and environment variables of a process.

    The Linux kernel imposes a size limit on the memory needed to store the arguments and environment variables of a process, 1/4 of the maximum stack size (RLIMIT_STACK). However, the pointers to these data were not taken into account, which allowed attackers to bypass the limit and even exhaust the stack of the process.
    https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-1000365
  • PSBM-88818

    Kernel crash in __run_hrtimer().

    It was found that the implementation of high resolution timers ('hrtimer' subsystem) did not handle the situation when a timer was started simultaneously with its restart in another thread. As a result, a BUG_ON() could trigger in __run_hrtimer() leading to kernel crash.
  • PSBM-88577

    Soft lockup in xfrm_policy_flush().

    If an error occurred during execution of xfrm_net_init() when a new network namespace was created, xfrm_policy_lock could remain uninitialized. As a result, soft lockup could happen in xfrm_policy_flush() if it tried to acquire the lock after that.
  • PSBM-88561

    ploop: kernel crash in dio_open().

    It was found that the implementation of ploop did not handle errors reported by kthread_create() properly. This could lead to a kernel crash in dio_open().
  • PSBM-87836

    Containers with NFS mounts failed to migrate: CRIU complained about nfs/clntX files.

    It was discovered that a container with NFS mounts could keep the files /var/lib/nfs/rpc_pipefs/nfs/clntX open, even if no NFS server was running there. As a result, CRIU reported errors when the users tried to migrate the container.
  • PSBM-88082

    File systems: insufficient error handling in sget() could lead to excessive memory consumption.

  • PSBM-73001

    sunrpc: potential kernel crash (use after free) in svc_process_common().

  • PSBM-87649

    Potential out-of-bounds read in fuse_dev_splice_write().

  • PSBM-87877

    Processes could get stuck in an unkillable state when using large FUSE KIO messages.

    It was found that rpc_get_hdr() function from 'fuse_kio_pcs' module did not return valid values in 'msg_size' in some cases. As a result, the processes using large FUSE KIO messages could get stuck in an unkillable state.