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Fencer Vulns
high 7.8

CVE-2026-68143 json

net: slip: serialize receive against buffer reallocation

published 2026-08-10 2 mo ago modified 2026-10-19 20 d ago also EUVD-2026-55526

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

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

net: slip: serialize receive against buffer reallocation

sl_realloc_bufs() replaces rbuff and updates buffsize while holding sl->lock. slip_receive_buf() reads those fields and writes through rbuff without holding the lock.

An MTU change can therefore race with receive processing. An MTU shrink can expose the new smaller rbuff with the old larger bound, causing an out-of-bounds write. A receive callback which already loaded the old rbuff can instead continue writing after that buffer has been freed.

Serialize receive processing with sl_realloc_bufs() by holding sl->lock while consuming each receive batch.

Patch / fix

  • Linux Linux 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6, 7.2
  • linux Debian 12 6.1.187-1
  • linux Debian 13 6.12.101-1
  • linux Debian 14 7.1.6-1
  • linux-6.12 Debian 12 6.12.101-1~deb12u1

debian advisories DEBIAN-CVE-2026-68143

  • linux Ubuntu 22.04 LTS 5.15.0-198.208
  • linux Ubuntu 24.04 LTS 6.8.0-147.147
  • linux Ubuntu 26.04 LTS 7.0.0-38.38
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1117.124
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1067.70
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1014.14
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1118.128
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1071.79

ubuntu advisories UBUNTU-CVE-2026-68143

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 RHEL 8 4.18.0-553.164.1.el8_10
  • perf RHEL 8 4.18.0-553.164.1.el8_10
  • bpftool RHEL 8 4.18.0-553.164.1.el8_10
  • kernel-core RHEL 8 4.18.0-553.164.1.el8_10
  • kernel-tools RHEL 8 4.18.0-553.164.1.el8_10
  • python3-perf RHEL 8 4.18.0-553.164.1.el8_10
  • kernel-modules RHEL 8 4.18.0-553.164.1.el8_10
  • kernel-zfcpdump RHEL 8 4.18.0-553.164.1.el8_10

red hat advisories RHSA-2026:68531RHSA-2026:68507RHSA-2026:68532RHSA-2026:67470

  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.81.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.81.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.81.1
  • kernel-source SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 6.4.0-150700.53.81.1
  • kernel-default SLE Workstation Extension 15 SP7, SLE Module for Legacy 15 SP7, SLE Module for Basesystem 15 SP7 +2 more 6.4.0-150700.53.81.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP7 6.4.0-150700.53.81.1
  • kernel-obs-build SLE Module for Development Tools 15 SP7 6.4.0-150700.53.81.1
  • kernel-default-base SLE Module for Basesystem 15 SP7 6.4.0-150700.53.81.1.150700.17.45.1

suse advisories SUSE-SU-2026:4254-1SUSE-SU-2026:23887-1SUSE-SU-2026:23902-1SUSE-SU-2026:23897-1SUSE-SU-2026:23881-1SUSE-SU-2026:4282-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.38.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.38.1

opensuse advisories openSUSE-SU-2026:21910-1

  • kernel AlmaLinux 10 6.12.0-211.56.1.el10_2
  • rv AlmaLinux 10 6.12.0-211.56.1.el10_2
  • perf AlmaLinux 10 6.12.0-211.56.1.el10_2
  • rtla AlmaLinux 10 6.12.0-211.56.1.el10_2
  • libperf AlmaLinux 10 6.12.0-211.56.1.el10_2
  • kernel-rt AlmaLinux 10 6.12.0-211.56.1.el10_2
  • kernel-64k AlmaLinux 10 6.12.0-211.56.1.el10_2
  • kernel-core AlmaLinux 10 6.12.0-211.56.1.el10_2

almalinux advisories ALSA-2026:68507ALSA-2026:68531ALSA-2026:68532ALSA-2026:67470

  • kernel Rocky Linux 10 6.12.0-211.56.1.el10_2.0.1
  • kernel-rt Rocky Linux 8 4.18.0-553.164.1.rt7.505.el8_10
  • kernel Rocky Linux 8 4.18.0-553.164.1.el8_10
  • kernel Rocky Linux 9 5.14.0-687.48.1.el9_8

rocky linux advisories RLSA-2026:68507RLSA-2026:68532RLSA-2026:68531RLSA-2026:67470

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-2026-68143 updated cvss 7.8

kernel: Linux kernel SLIP: Out-of-bounds write due to race condition during MTU change

  • 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, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.48.1.el9_8, perf 5.14.0-687.48.1.el9_8, rtla 5.14.0-687.48.1.el9_8, python3-perf 5.14.0-687.48.1.el9_8, kernel-devel-matched 5.14.0-687.48.1.el9_8, kernel-64k-devel-matched 5.14.0-687.48.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:67470
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.56.1.el10_2, perf 6.12.0-211.56.1.el10_2, rtla 6.12.0-211.56.1.el10_2, python3-perf 6.12.0-211.56.1.el10_2, kernel-devel-matched 6.12.0-211.56.1.el10_2, kernel-64k-devel-matched 6.12.0-211.56.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:68507
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.164.1.el8_10, kernel 4.18.0-553.164.1.el8_10, bpftool 4.18.0-553.164.1.el8_10, kernel-core 4.18.0-553.164.1.el8_10, kernel-tools 4.18.0-553.164.1.el8_10, python3-perf 4.18.0-553.164.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:68531
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.48.1.el9_8, kernel-64k 5.14.0-687.48.1.el9_8, kernel-core 5.14.0-687.48.1.el9_8, kernel-tools 5.14.0-687.48.1.el9_8, kernel-modules 5.14.0-687.48.1.el9_8, kernel-64k-core 5.14.0-687.48.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:67470
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.56.1.el10_2, kernel-64k 6.12.0-211.56.1.el10_2, kernel-core 6.12.0-211.56.1.el10_2, kernel-tools 6.12.0-211.56.1.el10_2, kernel-modules 6.12.0-211.56.1.el10_2, kernel-64k-core 6.12.0-211.56.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:68507
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.48.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.48.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.48.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.48.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.48.1.el9_8
    fixed: vendor fix RHSA-2026:67470
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.56.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.56.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.56.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.56.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.56.1.el10_2
    fixed: vendor fix RHSA-2026:68507
show 8 more
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.164.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.164.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.164.1.el8_10
    fixed: vendor fix RHSA-2026:68531
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-kvm 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-core 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-modules 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-debug-kvm 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-debug-core 4.18.0-553.164.1.rt7.505.el8_10, +4 more
    fixed: vendor fix RHSA-2026:68532
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.48.1.el9_8, kernel-rt-64k 5.14.0-687.48.1.el9_8, kernel-rt-core 5.14.0-687.48.1.el9_8, kernel-rt-modules 5.14.0-687.48.1.el9_8, kernel-rt-64k-core 5.14.0-687.48.1.el9_8, kernel-rt-debug-core 5.14.0-687.48.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:67470
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.56.1.el10_2, kernel-rt-64k 6.12.0-211.56.1.el10_2, kernel-rt-core 6.12.0-211.56.1.el10_2, kernel-rt-modules 6.12.0-211.56.1.el10_2, kernel-rt-64k-core 6.12.0-211.56.1.el10_2, kernel-rt-debug-core 6.12.0-211.56.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:68507
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.48.1.el9_8, kernel-rt-core 5.14.0-687.48.1.el9_8, kernel-rt-modules 5.14.0-687.48.1.el9_8, kernel-rt-debug-core 5.14.0-687.48.1.el9_8, kernel-rt-modules-core 5.14.0-687.48.1.el9_8, kernel-rt-debug-modules 5.14.0-687.48.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:67470
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.56.1.el10_2, kernel-rt-core 6.12.0-211.56.1.el10_2, kernel-rt-modules 6.12.0-211.56.1.el10_2, kernel-rt-debug-core 6.12.0-211.56.1.el10_2, kernel-rt-modules-core 6.12.0-211.56.1.el10_2, kernel-rt-debug-modules 6.12.0-211.56.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:68507
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-core 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-modules 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-debug-core 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-debug-modules 4.18.0-553.164.1.rt7.505.el8_10, kernel-rt-modules-extra 4.18.0-553.164.1.rt7.505.el8_10, +2 more
    fixed: vendor fix RHSA-2026:68532
  • Red Hat Enterprise Linux for NVIDIA 26 kernel
    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
24 d ago

Exploit prediction

0.11% chance of exploitation in the next 30 days, higher than 1% 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

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
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.