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redhatRedHatRHSA-2010:0161
HistoryMar 23, 2010 - 12:00 a.m.

(RHSA-2010:0161) Important: kernel-rt security and bug fix update

2010-03-2300:00:00
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38

7.8 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

0.041 Low

EPSS

Percentile

91.2%

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

This update fixes the following security issues:

  • a deficiency was found in the fasync_helper() implementation. This could
    allow a local, unprivileged user to leverage a use-after-free of locked,
    asynchronous file descriptors to cause a denial of service or privilege
    escalation. (CVE-2009-4141, Important)

  • multiple flaws were found in the mmap and mremap implementations. A
    local, unprivileged user could use these flaws to cause a local denial of
    service or escalate their privileges. (CVE-2010-0291, Important)

  • a missing boundary check was found in the do_move_pages() function in the
    memory migration functionality. A local user could use this flaw to cause a
    local denial of service or an information leak. (CVE-2010-0415, Important)

  • a NULL pointer dereference flaw was found in the ip6_dst_lookup_tail()
    function. An attacker on the local network could trigger this flaw by
    sending IPv6 traffic to a target system, leading to a system crash (kernel
    OOPS) if dst->neighbour is NULL on the target system when receiving an IPv6
    packet. (CVE-2010-0437, Important)

  • a NULL pointer dereference flaw was found in the Fast Userspace Mutexes
    (futexes) implementation. The unlock code path did not check if the futex
    value associated with pi_state->owner had been modified. A local user could
    use this flaw to modify the futex value, possibly leading to a denial of
    service or privilege escalation when the pi_state->owner pointer is
    dereferenced. (CVE-2010-0622, Important)

  • an information leak was found in the print_fatal_signal() implementation.
    When “/proc/sys/kernel/print-fatal-signals” is set to 1 (the default value
    is 0), memory that is reachable by the kernel could be leaked to
    user-space. This issue could also result in a system crash. Note that this
    flaw only affected the i386 architecture. (CVE-2010-0003, Moderate)

  • a flaw was found in the kernel connector implementation. A local,
    unprivileged user could trigger this flaw by sending an arbitrary amount of
    notification requests using specially-crafted netlink messages, resulting
    in a denial of service. (CVE-2010-0410, Moderate)

  • missing capability checks were found in the ebtables implementation, used
    for creating an Ethernet bridge firewall. This could allow a local,
    unprivileged user to bypass intended capability restrictions and modify
    ebtables rules. (CVE-2010-0007, Low)

This update also fixes the following bugs:

  • references were missing for two LSI MegaRAID SAS controllers already
    supported by the kernel, preventing systems using these controllers from
    booting. (BZ#554664)

  • a typo in the fix for CVE-2009-2691 resulted in gdb being unable to read
    core files created by gcore. (BZ#554965)

  • values for certain pointers used by the kernel, which should be
    undereferencable, could potentially be abused when a kernel OOPS occurs.
    Values that are harder to dereference are now used. (BZ#555227)

  • this update redesigns the locking scheme of the TTY process group
    (tty->pgrp) structure, due to race conditions introduced when tty->pgrp
    started using struct pid instead of pid_t. (BZ#559101)

  • the way the NFS kernel server used iget() and the way in which it kept
    its cache of inode information, could have led to (mainly on busy file
    servers) inconsistencies between the local file system and the file system
    being served to clients. (BZ#561275)

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.

7.8 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

0.041 Low

EPSS

Percentile

91.2%