Red Hat Security Advisory

RHSA-2019:1489

kernel security and bug fix update

Released 2019-06-17 · Red Hat rating Important · View on Red Hat →

Fixed in

Red Hat Enterprise Linux Server AUS (v. 6.6) kernel-2.6.32-504.79.3.el6, kernel-abi-whitelists-2.6.32-504.79.3.el6, kernel-debug-2.6.32-504.79.3.el6 +5
Red Hat Enterprise Linux Server Optional AUS (v. 6.6) python-perf-2.6.32-504.79.3.el6

Fixes 4 records

TI-2019-08569 CVE-2019-11477 · GHSA-748j-px2m-cwgh

Integer overflow in TCP_SKB_CB(skb)->tcp_gso_segs

HIGH 78

Jonathan Looney discovered that the TCP_SKB_CB(skb)->tcp_gso_segs value was subject to an integer overflow in the Linux kernel when handling TCP Selective Acknowledgments (SACKs).

CVSS 3.1HIGH 7.5 Network No auth No interaction EPSS 0.98745 Published 2019-06-18 Fixed in 4.4.182, 4.9.182 +3 CWE-190

TI-2019-08570 CVE-2019-11478 · GHSA-xh2h-cw6h-x9h5

SACK can cause extensive memory use via fragmented resend queue

HIGH 77

Jonathan Looney discovered that the TCP retransmission queue implementation in tcp_fragment in the Linux kernel could be fragmented when handling certain TCP Selective Acknowledgment (SACK) sequences.

CVSS 3.0HIGH 7.5 Network No auth No interaction EPSS 0.94414 Published 2019-06-18 Partial fix · 4.4.182, 4.9.182 +3 CWE-770

TI-2019-08571 CVE-2019-11479 · GHSA-99cq-xr7g-h22w

Resource allocation without limits in Linux kernel

HIGH 76

Jonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes.

CVSS 3.1HIGH 7.5 Network No auth No interaction EPSS 0.91326 Published 2019-06-18 Partial fix · 4.4.182, 4.9.182 +3 CWE-405

TI-2019-02905 CVE-2019-3896 · GHSA-2p8m-h2q6-92v8

Use after free in backstage kernel

LOW 34

A double-free can happen in idr_remove_all() in lib/idr.c in the Linux kernel 2.6 branch.

CVSS 3.0HIGH 7.8 Local Low privileges No interaction EPSS 0.00417 Published 2019-06-18 Partial fix CWE-416