Synopsis

Important: kernel-alt security and bug fix update

Type/Severity

Security Advisory: Important

Topic

An update for kernel-alt is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The kernel-alt packages provide the Linux kernel version 4.x.

Security Fix(es):

• kernel: MIDI driver race condition leads to a double-free (CVE-2018-10902)
• kernel: Use-after-free in __blk_drain_queue() function in block/blk-core.c (CVE-2018-20856)
• kernel: brcmfmac heap buffer overflow in brcmf_wowl_nd_results (CVE-2019-9500)
• hardware: bluetooth: BR/EDR encryption key negotiation attacks (KNOB) (CVE-2019-9506)
• kernel: a NULL pointer dereference in drivers/scsi/megaraid/megaraid_sas_base.c leading to DoS (CVE-2019-11810)

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):

• kernel modules pkey and paes_s390 are not available (BZ#1719192)
• pkey: Indicate old mkvp only if old and curr. mkvp are different (BZ#1720621)
• System dropped into Mon running softboots Exception: 501 (Hardware Interrupt) at c00000000000a814 replay_interrupt_return+0x0/0x4 (ipmi) (BZ#1737563)
• kernel: jump label transformation performance (BZ#1739143)
• Backport i40e MDD detection removal for PFs (BZ#1747618)

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Affected Products

• Red Hat Enterprise Linux for ARM 64 7 aarch64
• Red Hat Enterprise Linux for Power 9 7 ppc64le
• Red Hat Enterprise Linux for IBM System z (Structure A) 7 s390x

Fixes

• BZ - 1590720 - CVE-2018-10902 kernel: MIDI driver race condition leads to a double-free
• BZ - 1701224 - CVE-2019-9500 kernel: brcmfmac heap buffer overflow in brcmf_wowl_nd_results
• BZ - 1709164 - CVE-2019-11810 kernel: a NULL pointer dereference in drivers/scsi/megaraid/megaraid_sas_base.c leading to DoS
• BZ - 1727857 - CVE-2019-9506 hardware: bluetooth: BR/EDR encryption key negotiation attacks (KNOB)
• BZ - 1738705 - CVE-2018-20856 kernel: Use-after-free in __blk_drain_queue() function in block/blk-core.c

CVEs

• CVE-2018-10902
• CVE-2018-20856
• CVE-2019-9500
• CVE-2019-9506
• CVE-2019-11810

References