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HistoryAug 10, 2010 - 12:00 a.m.

(RHSA-2010:0610) Important: kernel security and bug fix update


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The kernel packages contain the Linux kernel, the core of any Linux
operating system.

This update fixes the following security issues:

  • instances of unsafe sprintf() use were found in the Linux kernel
    Bluetooth implementation. Creating a large number of Bluetooth L2CAP, SCO,
    or RFCOMM sockets could result in arbitrary memory pages being overwritten.
    A local, unprivileged user could use this flaw to cause a kernel panic
    (denial of service) or escalate their privileges. (CVE-2010-1084,

  • a flaw was found in the Xen hypervisor implementation when using the
    Intel Itanium architecture, allowing guests to enter an unsupported state.
    An unprivileged guest user could trigger this flaw by setting the BE (Big
    Endian) bit of the Processor Status Register (PSR), leading to the guest
    crashing (denial of service). (CVE-2010-2070, Important)

  • a flaw was found in the CIFSSMBWrite() function in the Linux kernel
    Common Internet File System (CIFS) implementation. A remote attacker could
    send a specially-crafted SMB response packet to a target CIFS client,
    resulting in a kernel panic (denial of service). (CVE-2010-2248, Important)

  • buffer overflow flaws were found in the Linux kernel’s implementation of
    the server-side External Data Representation (XDR) for the Network File
    System (NFS) version 4. An attacker on the local network could send a
    specially-crafted large compound request to the NFSv4 server, which could
    possibly result in a kernel panic (denial of service) or, potentially, code
    execution. (CVE-2010-2521, Important)

  • a flaw was found in the handling of the SWAPEXT IOCTL in the Linux kernel
    XFS file system implementation. A local user could use this flaw to read
    write-only files, that they do not own, on an XFS file system. This could
    lead to unintended information disclosure. (CVE-2010-2226, Moderate)

  • a flaw was found in the dns_resolver upcall used by CIFS. A local,
    unprivileged user could redirect a Microsoft Distributed File System link
    to another IP address, tricking the client into mounting the share from a
    server of the user’s choosing. (CVE-2010-2524, Moderate)

  • a missing check was found in the mext_check_arguments() function in the
    ext4 file system code. A local user could use this flaw to cause the
    MOVE_EXT IOCTL to overwrite the contents of an append-only file on an ext4
    file system, if they have write permissions for that file. (CVE-2010-2066,

Red Hat would like to thank Neil Brown for reporting CVE-2010-1084, and Dan
Rosenberg for reporting CVE-2010-2226 and CVE-2010-2066.

This update also fixes several bugs. Documentation for these bug fixes will
be available shortly from the Technical Notes document linked to in the

Users should upgrade to these updated packages, which contain backported
patches to correct these issues. The system must be rebooted for this
update to take effect.