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Fencer Intel
high 7.8

CVE-2017-17805 json

The Salsa20 encryption algorithm in the Linux kernel before 4.14.8 does not correctly handle zero-length inputs, allowing a local attacker…

published 8y ago modified 4mo ago also EUVD-2017-8956

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits
0
none known

Summary

The Salsa20 encryption algorithm in the Linux kernel before 4.14.8 does not correctly handle zero-length inputs, allowing a local attacker able to use the AF_ALG-based skcipher interface (CONFIG_CRYPTO_USER_API_SKCIPHER) to cause a denial of service (uninitialized-memory free and kernel crash) or have unspecified other impact by executing a crafted sequence of system calls that use the blkcipher_walk API. Both the generic implementation (crypto/salsa20_generic.c) and x86 implementation (arch/x86/crypto/salsa20_glue.c) of Salsa20 were vulnerable.

Patch / fix

  • linux linux_kernel 3.2.97, 3.16.52, 3.18.89, 4.1.49, 4.4.107, 4.9.71, 4.14.8
  • linux Debian 14, Debian 13, Debian 12 4.14.7-1

debian advisories DEBIAN-CVE-2017-17805

  • linux Ubuntu 14.04 LTS 3.13.0-144.193
  • linux Ubuntu 16.04 LTS 4.4.0-119.143
  • linux-aws Ubuntu 14.04 LTS 4.4.0-1016.16
  • linux-aws Ubuntu 16.04 LTS 4.4.0-1054.63
  • linux-gcp Ubuntu 16.04 LTS 4.13.0-1012.16
  • linux-hwe Ubuntu 16.04 LTS 4.13.0-41.46~16.04.1
  • linux-kvm Ubuntu 16.04 LTS 4.4.0-1020.25
  • linux-oem Ubuntu 16.04 LTS 4.13.0-1022.24

ubuntu advisories UBUNTU-CVE-2017-17805

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-alt RHEL 7 4.14.0-115.el7a
  • perf RHEL 7 4.14.0-115.el7a
  • kernel RHEL 7 4.14.0-115.el7a
  • python-perf RHEL 7 4.14.0-115.el7a
  • kernel-tools RHEL 7 4.14.0-115.el7a
  • kernel-tools-libs RHEL 7 4.14.0-115.el7a
  • kernel-bootwrapper RHEL 7 4.14.0-115.el7a
  • kernel-abi-whitelists RHEL 7 4.14.0-115.el7a

red hat advisories RHSA-2018:2948RHSA-2019:2473RHSA-2018:3096RHSA-2018:3083

  • kernel-ec2 SLE Module for Public Cloud 12 3.12.74-60.64.82.1
  • kernel-xen SLES for SAP 12 SP1, SLES 12 SP1-LTSS, OpenStack Cloud 6 3.12.74-60.64.82.1
  • kernel-syms SLES for SAP 12 SP1, SLES 12 SP1-LTSS, OpenStack Cloud 6 3.12.74-60.64.82.1
  • kernel-source SLES for SAP 12 SP1, SLES 12 SP1-LTSS, OpenStack Cloud 6 3.12.74-60.64.82.1
  • kernel-default SLES for SAP 12 SP1, SLES 12 SP1-LTSS, OpenStack Cloud 6 3.12.74-60.64.82.1
  • kgraft-patch-SLE12-SP1_Update_25 SLES for SAP 12 SP1, SLES 12 SP1-LTSS, OpenStack Cloud 6 1-2.9.1
  • kernel-ec2 SLE Module for Public Cloud 12 3.12.61-52.119.1
  • kernel-rt SLE Real Time 12 SP2 4.4.104-24.1

suse advisories SUSE-SU-2018:0525-1SUSE-SU-2018:0437-1SUSE-SU-2018:0213-1SUSE-SU-2018:0180-1SUSE-SU-2018:0040-1SUSE-SU-2018:0011-1

  • linux Arch Linux 4.14.11-1
  • linux-lts Arch Linux 4.9.74-1
  • linux-zen Arch Linux 4.14.11-1
  • linux-hardened Arch Linux 4.14.11.a-1

arch linux advisories AVG-552AVG-561AVG-571AVG-574

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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-2017-17805 updated cvss 5.5

kernel: Salsa20 encryption algorithm does not correctly handle zero-length inputs allowing local attackers to cause denial-of-service

  • Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    affected: no fix available
  • Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-957.el7, kernel 3.10.0-957.el7, bpftool 3.10.0-957.el7, python-perf 3.10.0-957.el7, kernel-tools 3.10.0-957.el7, kernel-tools-libs 3.10.0-957.el7, +2 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-957.el7 Red Hat Enterprise Linux ComputeNode (v. 7) perf 3.10.0-957.el7, kernel 3.10.0-957.el7, bpftool 3.10.0-957.el7, python-perf 3.10.0-957.el7, kernel-tools 3.10.0-957.el7, kernel-tools-libs 3.10.0-957.el7, +2 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-957.el7
    fixed: vendor fix RHSA-2018:3083
  • Red Hat Enterprise Linux Desktop (v. 6) perf 2.6.32-754.18.2.el6, kernel 2.6.32-754.18.2.el6, kernel-firmware 2.6.32-754.18.2.el6, kernel-abi-whitelists 2.6.32-754.18.2.el6, kernel-debuginfo-common-i686 2.6.32-754.18.2.el6, kernel-debuginfo-common-x86_64 2.6.32-754.18.2.el6 Red Hat Enterprise Linux Desktop Optional (v. 6) python-perf 2.6.32-754.18.2.el6, kernel-debuginfo-common-i686 2.6.32-754.18.2.el6, kernel-debuginfo-common-x86_64 2.6.32-754.18.2.el6
    fixed: vendor fix RHSA-2019:2473
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) perf 3.10.0-957.el7, perf 4.14.0-115.el7a, kernel 3.10.0-957.el7, kernel 4.14.0-115.el7a, kernel-alt 4.14.0-115.el7a, python-perf 3.10.0-957.el7, +13 more Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) kernel-debuginfo-common-ppc64le 3.10.0-957.el7, kernel-debuginfo-common-ppc64le 4.14.0-115.el7a
    fixed: vendor fix RHSA-2018:3083
  • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt 3.10.0-957.rt56.910.el7, kernel-rt-trace 3.10.0-957.rt56.910.el7 Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt 3.10.0-957.rt56.910.el7, kernel-rt-kvm 3.10.0-957.rt56.910.el7, kernel-rt-trace 3.10.0-957.rt56.910.el7, kernel-rt-debug-kvm 3.10.0-957.rt56.910.el7, kernel-rt-trace-kvm 3.10.0-957.rt56.910.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-957.rt56.910.el7
    fixed: vendor fix RHSA-2018:3096
  • Red Hat Enterprise Linux HPC Node (v. 6) perf 2.6.32-754.18.2.el6, kernel 2.6.32-754.18.2.el6, kernel-firmware 2.6.32-754.18.2.el6, kernel-abi-whitelists 2.6.32-754.18.2.el6, kernel-debuginfo-common-i686 2.6.32-754.18.2.el6, kernel-debuginfo-common-x86_64 2.6.32-754.18.2.el6 Red Hat Enterprise Linux HPC Node Optional (v. 6) python-perf 2.6.32-754.18.2.el6, kernel-debuginfo-common-x86_64 2.6.32-754.18.2.el6 Red Hat Enterprise Linux Server (v. 6) perf 2.6.32-754.18.2.el6, kernel 2.6.32-754.18.2.el6, kernel-kdump 2.6.32-754.18.2.el6, kernel-firmware 2.6.32-754.18.2.el6, kernel-bootwrapper 2.6.32-754.18.2.el6, kernel-abi-whitelists 2.6.32-754.18.2.el6, +4 more
    fixed: vendor fix RHSA-2019:2473
  • Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-957.el7, kernel 3.10.0-957.el7, bpftool 3.10.0-957.el7, python-perf 3.10.0-957.el7, kernel-kdump 3.10.0-957.el7, kernel-tools 3.10.0-957.el7, +7 more
    fixed: vendor fix RHSA-2018:3083
  • Red Hat Enterprise Linux Server Optional (v. 6) python-perf 2.6.32-754.18.2.el6, kernel-debuginfo-common-i686 2.6.32-754.18.2.el6, kernel-debuginfo-common-ppc64 2.6.32-754.18.2.el6, kernel-debuginfo-common-s390x 2.6.32-754.18.2.el6, kernel-debuginfo-common-x86_64 2.6.32-754.18.2.el6
    fixed: vendor fix RHSA-2019:2473
show 6 more
  • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-957.el7, kernel-debuginfo-common-x86_64 3.10.0-957.el7, kernel-debuginfo-common-ppc64le 3.10.0-957.el7
    fixed: vendor fix RHSA-2018:3083
  • Red Hat Enterprise Linux Workstation (v. 6) perf 2.6.32-754.18.2.el6, kernel 2.6.32-754.18.2.el6, kernel-firmware 2.6.32-754.18.2.el6, kernel-abi-whitelists 2.6.32-754.18.2.el6, kernel-debuginfo-common-i686 2.6.32-754.18.2.el6, kernel-debuginfo-common-x86_64 2.6.32-754.18.2.el6
    fixed: vendor fix RHSA-2019:2473
  • Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-957.el7, kernel 3.10.0-957.el7, bpftool 3.10.0-957.el7, python-perf 3.10.0-957.el7, kernel-tools 3.10.0-957.el7, kernel-tools-libs 3.10.0-957.el7, +2 more
    fixed: vendor fix RHSA-2018:3083
  • Red Hat Enterprise Linux Workstation Optional (v. 6) python-perf 2.6.32-754.18.2.el6, kernel-debuginfo-common-i686 2.6.32-754.18.2.el6, kernel-debuginfo-common-x86_64 2.6.32-754.18.2.el6
    fixed: vendor fix RHSA-2019:2473
  • Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-957.el7
    fixed: vendor fix RHSA-2018:3083
  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-core, kernel-tools, python3-perf, +17 more Red Hat Enterprise Linux Client (v. 7) kernel-headers 3.10.0-957.el7 Red Hat Enterprise Linux ComputeNode (v. 7) kernel-headers 3.10.0-957.el7 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) kernel-headers 3.10.0-957.el7 Red Hat Enterprise Linux Server (v. 7) kernel-headers 3.10.0-957.el7
    +1 more products
    Red Hat Enterprise Linux Workstation (v. 7) kernel-headers 3.10.0-957.el7
    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

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
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

Classification

Weakness
  • CWE-20 Improper Input Validation
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.