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Fencer Intel
high 7.1

CVE-2017-7482 json

In the Linux kernel before version 4.12, Kerberos 5 tickets decoded when using the RXRPC keys incorrectly assumes the size of a field.

published 2018-07-30 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-16502

cvss
7.1
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

In the Linux kernel before version 4.12, Kerberos 5 tickets decoded when using the RXRPC keys incorrectly assumes the size of a field. This could lead to the size-remaining variable wrapping and the data pointer going over the end of the buffer. This could possibly lead to memory corruption and possible privilege escalation.

Patch / fix

  • linux linux_kernel 3.2.90, 3.10.108, 3.16.45, 3.18.59, 4.1.43, 4.4.75, 4.9.35, 4.11.8
  • linux Debian 14, Debian 13, Debian 12 4.11.11-1

debian advisories DEBIAN-CVE-2017-7482

  • linux Ubuntu 14.04 LTS 3.13.0-126.175
  • linux Ubuntu 16.04 LTS 4.4.0-89.112
  • linux-aws Ubuntu 16.04 LTS 4.4.0-1028.37
  • linux-gke Ubuntu 16.04 LTS 4.4.0-1024.24
  • linux-hwe Ubuntu 16.04 LTS 4.10.0-32.36~16.04.1
  • linux-raspi2 Ubuntu 16.04 LTS 4.4.0-1067.75
  • linux-lts-xenial Ubuntu 14.04 LTS 4.4.0-89.112~14.04.1
  • linux-snapdragon Ubuntu 16.04 LTS 4.4.0-1069.74

ubuntu advisories UBUNTU-CVE-2017-7482

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-rt enterprise mrg 2 1:3.10.0-693.46.1.rt56.639.el6rt
  • kernel-rt-trace enterprise mrg 2 1:3.10.0-693.46.1.rt56.639.el6rt
  • kernel-rt-vanilla enterprise mrg 2 1:3.10.0-693.46.1.rt56.639.el6rt
  • kernel-rt-firmware enterprise mrg 2 1:3.10.0-693.46.1.rt56.639.el6rt
  • kernel-rt-debuginfo-common-x86_64 enterprise mrg 2 1:3.10.0-693.46.1.rt56.639.el6rt

red hat advisories RHSA-2019:0641

  • kernel-rt SLE Real Time 12 SP2 4.4.104-24.1
  • kernel-syms-rt SLE Real Time 12 SP2 4.4.104-24.1
  • kernel-rt_debug SLE Real Time 12 SP2 4.4.104-24.1
  • kernel-source-rt SLE Real Time 12 SP2 4.4.104-24.1
  • kernel-syms SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +1 more 4.4.103-92.53.1
  • kernel-source SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +1 more 4.4.103-92.53.1
  • kernel-default SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +3 more 4.4.103-92.53.1
  • kernel-obs-build SLE Software Development Kit 12 SP2 4.4.103-92.53.1

suse advisories SUSE-SU-2018:0213-1SUSE-SU-2017:3410-1SUSE-SU-2017:3398-1SUSE-SU-2017:2920-1SUSE-SU-2017:2908-1SUSE-SU-2017:2525-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-7482 updated cvss 7.1

kernel: net/rxrpc: overflow in decoding of krb5 principal

  • Red Hat Enterprise Linux 7 kernel-rt, kernel-rt-kvm, kernel-rt-trace, kernel-rt-debug-kvm, kernel-rt-trace-kvm
    affected: no fix available
  • Red Hat MRG Realtime for RHEL 6 Server v.2 kernel-rt 3.10.0-693.46.1.rt56.639.el6rt, kernel-rt-trace 3.10.0-693.46.1.rt56.639.el6rt, kernel-rt-vanilla 3.10.0-693.46.1.rt56.639.el6rt, kernel-rt-firmware 3.10.0-693.46.1.rt56.639.el6rt, kernel-rt-debuginfo-common-x86_64 3.10.0-693.46.1.rt56.639.el6rt
    fixed: vendor fix RHSA-2019:0641
  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, python-perf, kernel-kdump, kernel-tools, +3 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.0 7.1 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • [UNKNOWN] kernel:

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.