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redhatRedHatRHSA-2019:1483
HistoryJun 17, 2019 - 6:34 p.m.

(RHSA-2019:1483) Important: kernel security, bug fix, and enhancement update

2019-06-1718:34:36
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343

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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

0.974 High

EPSS

Percentile

99.9%

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

Security Fix(es):

  • An integer overflow flaw was found in the way the Linux kernel’s networking subsystem processed TCP Selective Acknowledgment (SACK) segments. While processing SACK segments, the Linux kernel’s socket buffer (SKB) data structure becomes fragmented. Each fragment is about TCP maximum segment size (MSS) bytes. To efficiently process SACK blocks, the Linux kernel merges multiple fragmented SKBs into one, potentially overflowing the variable holding the number of segments. A remote attacker could use this flaw to crash the Linux kernel by sending a crafted sequence of SACK segments on a TCP connection with small value of TCP MSS, resulting in a denial of service (DoS). (CVE-2019-11477)

  • kernel: race condition in snd_seq_write() may lead to UAF or OOB-access (CVE-2018-7566)

  • kernel: Race condition in sound system can lead to denial of service (CVE-2018-1000004)

  • Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service (CVE-2019-11478)

  • Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service (CVE-2019-11479)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Bug Fix(es):

  • Mistmach between ‘tty->termios->c_lflag’ and ‘ldata->icanon’ for ‘ICANON’ (BZ#1708061)

  • RHEL7: rwsem reader/writer mutual exclusion guarantee may not work (BZ#1709702)

  • hardened usercopy is causing crash (BZ#1712311)

  • [RHEL7] md_clear flag missing from /proc/cpuinfo on late microcode update (BZ#1712991)

  • [RHEL7] MDS mitigations are not enabled after double microcode update (BZ#1712996)

  • WARNING: CPU: 0 PID: 0 at kernel/jump_label.c:90 __static_key_slow_dec+0xa6/0xb0 (BZ#1713002)

  • [debug kernel] [x86_64]INFO: possible circular locking dependency detected (BZ#1715326)

  • RHEL-7.7: tty: termios_rwsem possible deadlock (BZ#1715329)

Enhancement(s):

  • [MCHP 7.7 FEAT] Update smartpqi driver to latest upstream (BZ#1709467)

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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

0.974 High

EPSS

Percentile

99.9%