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Fencer Vulns
high 7.8

CVE-2026-17523 json

can: bcm: switch timer to HRTIMER_MODE_SOFT and remove hrtimer_tasklet

published 2026-07-27 3 mo ago modified 2026-10-02 37 d ago also EUVD-2026-49133

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 5%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

can: bcm: switch timer to HRTIMER_MODE_SOFT and remove hrtimer_tasklet

This patch switches the timer to HRTIMER_MODE_SOFT, which executed the timer callback in softirq context and removes the hrtimer_tasklet.

Patch / fix

  • Linux Linux 4.19.226, 5.4
  • linux Debian 14, Debian 13, Debian 12 5.4.6-1

debian advisories DEBIAN-CVE-2026-17523

  • kernel RHEL 8 4.18.0-553.156.1.el8_10
  • perf RHEL 8 4.18.0-553.156.1.el8_10
  • bpftool RHEL 8 4.18.0-553.156.1.el8_10
  • kernel-core RHEL 8 4.18.0-553.156.1.el8_10
  • kernel-tools RHEL 8 4.18.0-553.156.1.el8_10
  • python3-perf RHEL 8 4.18.0-553.156.1.el8_10
  • kernel-modules RHEL 8 4.18.0-553.156.1.el8_10
  • kernel-zfcpdump RHEL 8 4.18.0-553.156.1.el8_10

red hat advisories RHSA-2026:65711RHSA-2026:65710RHSA-2026:61932RHSA-2026:55764RHSA-2026:55765

  • kernel AlmaLinux 8 4.18.0-553.156.1.el8_10
  • perf AlmaLinux 8 4.18.0-553.156.1.el8_10
  • bpftool AlmaLinux 8 4.18.0-553.156.1.el8_10
  • kernel-core AlmaLinux 8 4.18.0-553.156.1.el8_10
  • kernel-tools AlmaLinux 8 4.18.0-553.156.1.el8_10
  • python3-perf AlmaLinux 8 4.18.0-553.156.1.el8_10
  • kernel-modules AlmaLinux 8 4.18.0-553.156.1.el8_10
  • kernel-zfcpdump AlmaLinux 8 4.18.0-553.156.1.el8_10

almalinux advisories ALSA-2026:55764ALSA-2026:55765

  • kernel-rt Rocky Linux 8 4.18.0-553.156.1.rt7.497.el8_10
  • kernel Rocky Linux 8 4.18.0-553.156.1.el8_10

rocky linux advisories RLSA-2026:55765RLSA-2026:55764

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-2026-17523 updated cvss 7.8

kernel: can:bcm: arbitrary kernel code execution leading to escalate privileges

  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.156.1.el8_10, kernel 4.18.0-553.156.1.el8_10, bpftool 4.18.0-553.156.1.el8_10, kernel-core 4.18.0-553.156.1.el8_10, kernel-tools 4.18.0-553.156.1.el8_10, python3-perf 4.18.0-553.156.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:55764
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.206.1.el8_4, kernel 4.18.0-305.206.1.el8_4, bpftool 4.18.0-305.206.1.el8_4, kernel-core 4.18.0-305.206.1.el8_4, kernel-tools 4.18.0-305.206.1.el8_4, python3-perf 4.18.0-305.206.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:65710
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.213.1.el8_6, kernel 4.18.0-372.213.1.el8_6, bpftool 4.18.0-372.213.1.el8_6, kernel-core 4.18.0-372.213.1.el8_6, kernel-tools 4.18.0-372.213.1.el8_6, python3-perf 4.18.0-372.213.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:65711
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.163.1.el8_8, kernel 4.18.0-477.163.1.el8_8, bpftool 4.18.0-477.163.1.el8_8, kernel-core 4.18.0-477.163.1.el8_8, kernel-tools 4.18.0-477.163.1.el8_8, python3-perf 4.18.0-477.163.1.el8_8, +9 more
    fixed: vendor fix RHSA-2026:61932
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.206.1.el8_4, kernel 4.18.0-305.206.1.el8_4, bpftool 4.18.0-305.206.1.el8_4, kernel-core 4.18.0-305.206.1.el8_4, kernel-tools 4.18.0-305.206.1.el8_4, python3-perf 4.18.0-305.206.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:65710
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) perf 4.18.0-372.213.1.el8_6, kernel 4.18.0-372.213.1.el8_6, bpftool 4.18.0-372.213.1.el8_6, kernel-core 4.18.0-372.213.1.el8_6, kernel-tools 4.18.0-372.213.1.el8_6, python3-perf 4.18.0-372.213.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:65711
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.163.1.el8_8, kernel 4.18.0-477.163.1.el8_8, bpftool 4.18.0-477.163.1.el8_8, kernel-core 4.18.0-477.163.1.el8_8, kernel-tools 4.18.0-477.163.1.el8_8, python3-perf 4.18.0-477.163.1.el8_8, +8 more
    fixed: vendor fix RHSA-2026:61932
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.156.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.156.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.156.1.el8_10
    fixed: vendor fix RHSA-2026:55764
show 2 more
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-kvm 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-core 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-modules 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-debug-kvm 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-debug-core 4.18.0-553.156.1.rt7.497.el8_10, +4 more Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-core 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-modules 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-debug-core 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-debug-modules 4.18.0-553.156.1.rt7.497.el8_10, kernel-rt-modules-extra 4.18.0-553.156.1.rt7.497.el8_10, +2 more
    fixed: vendor fix RHSA-2026:55765
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +2 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +9 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +84 more Red Hat Enterprise Linux 10 kernel 6.12.0-55.92.1.el10_0
    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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
3 mo ago

Exploit prediction

0.17% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux

Classification

Technology feeds

References

Sources

Fencer Vulns 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.