Security Advisory Important: kernel-rt security update

Advisory: RHSA-2017:0295-8
Type: Security Advisory
Severity: Important
Issued on: 2017-02-22
Last updated on: 2017-03-06
Affected Products: Red Hat Enterprise Linux for Real Time (v. 7)
CVEs (cve.mitre.org): CVE-2017-6074

Details

An update for kernel-rt 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.

The kernel-rt packages provide the Real Time Linux Kernel, which enables
fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

* A use-after-free flaw was found in the way the Linux kernel's Datagram
Congestion Control Protocol (DCCP) implementation freed SKB (socket buffer)
resources for a DCCP_PKT_REQUEST packet when the IPV6_RECVPKTINFO option is set
on the socket. A local, unprivileged user could use this flaw to alter the
kernel memory, allowing them to escalate their privileges on the system.
(CVE-2017-6074, Important)


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.

Updated packages

Red Hat Enterprise Linux for Real Time (v. 7)

SRPMS:
kernel-rt-3.10.0-514.6.1.rt56.430.el7.src.rpm
File outdated by:  RHSA-2017:1298
    MD5: d4d950363dcba3ad3735198abc5134c3
SHA-256: d76fc19d6fa9d1256762e4056d7da088c15a0f49414e5fe92b4dce8f6a277f3b
 
x86_64:
kernel-rt-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm
File outdated by:  RHSA-2017:1298
    MD5: 7d2dc92b8ed8e56a9197369028982c97
SHA-256: f677096559d604b490608add3e3ff292cd3b574eb749f5b32768d3c153e52505
kernel-rt-debug-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm
File outdated by:  RHSA-2017:1298
    MD5: 38f5ca4cfb5095d4cc67cf3da9dd87d3
SHA-256: d5c0cede15ea09601e99d45077d606dfb23fc1819d4e7b0aea35bfd1f6340ba3
kernel-rt-debug-debuginfo-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm
File outdated by:  RHSA-2017:1298
    MD5: 763d399be26af918550ef65aef5b95b7
SHA-256: dd3cca7cb16beea7588e452d5e8f40e96fbc805c3e83be7a6958fe2d2c955b6d
kernel-rt-debug-devel-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm
File outdated by:  RHSA-2017:1298
    MD5: 838d4914b1b06f755d3860f61f6ed3e9
SHA-256: ead230ec0f9aedb13e73634c5d0288777b51083acdc5d969a7bb10d32f72fa8d
kernel-rt-debuginfo-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm
File outdated by:  RHSA-2017:1298
    MD5: 7286e390f3666d4c2732069ffd958a69
SHA-256: 0882f15fe4afc2a6907856ac6ca90bed5a67924170698434e1faffaac6d5e4b6
kernel-rt-debuginfo-common-x86_64-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm
File outdated by:  RHSA-2017:1298
    MD5: 55bb149c43546ec0b930015e9e1b7039
SHA-256: bef82ecef8899baa7cea49f45117e62c554a8925c39aeafdc3b5258fb57dc189
kernel-rt-devel-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm
File outdated by:  RHSA-2017:1298
    MD5: 1ee87b9929dc1d2af045878c7423ed37
SHA-256: 27a72e2586980ce3e87bd1ca1443c114fed8b3fffdbef788371190fa2b151a8a
kernel-rt-doc-3.10.0-514.6.1.rt56.430.el7.noarch.rpm
File outdated by:  RHSA-2017:1298
    MD5: d48cab2ceaedb3c7695856c4fe5c9037
SHA-256: 0aad4ad15aa8f92a15f1cdb1bf37fba6c7c0e40c654543bf519f6e9fa7521317
kernel-rt-trace-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm
File outdated by:  RHSA-2017:1298
    MD5: 11a400e866d10e198915f845e4490fd6
SHA-256: c2fa96629a52a5c1c88724872d72e343da1044c545fd838eb57f585eda8dc3ca
kernel-rt-trace-debuginfo-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm
File outdated by:  RHSA-2017:1298
    MD5: ef57888c213cf480a918fd61a3c680ae
SHA-256: f3d431b517fd27b24a8a54e21cd1898a31f2509fbde7038cbe70bcbff2d438d7
kernel-rt-trace-devel-3.10.0-514.6.1.rt56.430.el7.x86_64.rpm
File outdated by:  RHSA-2017:1298
    MD5: 1e24f9bc281ff2228403d6276fe11f3d
SHA-256: 006e8c399d4b62f3470180d785227e4b9ca05e6659cc98062d50635a669451c6
 
(The unlinked packages above are only available from the Red Hat Network)

Bugs fixed (see bugzilla for more information)

1423071 - CVE-2017-6074 kernel: use after free in dccp protocol


References



These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from:
https://www.redhat.com/security/team/key/#package

The Red Hat security contact is secalert@redhat.com. More contact details at http://www.redhat.com/security/team/contact/