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Fencer Vulns
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CVE-2026-68188 json

Bluetooth: RFCOMM: Fix session UAF in set_termios

published 2026-08-10 2 mo ago modified 2026-11-06 2 d ago also EUVD-2026-55289

cvss
—
not scored
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits
0
none known

Summary

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

Bluetooth: RFCOMM: Fix session UAF in set_termios

rfcomm_tty_set_termios() tests dlc->session without rfcomm_mutex and later passes the pointer to rfcomm_send_rpn(). The latter dereferences both session->initiator and session->sock. Meanwhile, krfcommd can unlink the DLC and free the session while holding rfcomm_mutex.

The race can proceed as follows:

TTY ioctl task krfcommd -------------- -------- load dlc->session enter rfcomm_send_rpn() lock rfcomm_mutex clear dlc->session free session unlock rfcomm_mutex read session->initiator

KASAN reported:

BUG: KASAN: slab-use-after-free in rfcomm_send_rpn+0x297/0x2a0 Read of size 4 at addr ffff88810012a850 by task poc/92

Call Trace: rfcomm_send_rpn+0x297/0x2a0 rfcomm_tty_set_termios+0x50d/0x850 tty_set_termios+0x596/0x950 set_termios+0x46a/0x6e0 tty_mode_ioctl+0x152/0xbd0 tty_ioctl+0x915/0x1240 __x64_sys_ioctl+0x134/0x1c0

Allocated by task 92: rfcomm_session_add+0x9e/0x2e0 rfcomm_dlc_open+0x8b1/0xe00 rfcomm_dev_activate+0x85/0x1a0 rfcomm_tty_open+0x90/0x280

Freed by task 68: kfree+0x131/0x3c0 rfcomm_session_del+0x119/0x180 rfcomm_run+0x737/0x4710

Add rfcomm_dlc_send_rpn(), which holds rfcomm_mutex while it verifies that the DLC is still attached and sends the RPN frame. Have the TTY path use the helper and drop its unlocked session check. This keeps the session valid through both the frame construction and socket send.

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-2026-68188

  • 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-2026-68188

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 10.2 6.12.0-211.58.1.el10_2
  • rv RHEL 10.2 6.12.0-211.58.1.el10_2
  • perf RHEL 10.2 6.12.0-211.58.1.el10_2
  • rtla RHEL 10.2 6.12.0-211.58.1.el10_2
  • libperf RHEL 10.2 6.12.0-211.58.1.el10_2
  • kernel-rt RHEL 10.2 6.12.0-211.58.1.el10_2
  • kernel-64k RHEL 10.2 6.12.0-211.58.1.el10_2
  • kernel-core RHEL 10.2 6.12.0-211.58.1.el10_2

red hat advisories RHSA-2026:70498RHSA-2026:70459RHSA-2026:70403RHSA-2026:70402

  • 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

  • rv AlmaLinux 10 6.12.0-211.58.1.el10_2
  • perf AlmaLinux 10 6.12.0-211.58.1.el10_2
  • rtla AlmaLinux 10 6.12.0-211.58.1.el10_2
  • libperf AlmaLinux 10 6.12.0-211.58.1.el10_2
  • kernel-rt AlmaLinux 10 6.12.0-211.58.1.el10_2
  • kernel-tools AlmaLinux 10 6.12.0-211.58.1.el10_2
  • python3-perf AlmaLinux 10 6.12.0-211.58.1.el10_2
  • kernel-rt-64k AlmaLinux 10 6.12.0-211.58.1.el10_2

almalinux advisories ALSA-2026:70498ALSA-2026:70402ALSA-2026:70403ALSA-2026:70459

  • kernel Rocky Linux 9 5.14.0-687.50.1.el9_8
  • kernel Rocky Linux 10 6.12.0-211.58.1.el10_2
  • kernel-rt Rocky Linux 8 4.18.0-553.166.1.rt7.507.el8_10
  • kernel Rocky Linux 8 4.18.0-553.166.1.el8_10

rocky linux advisories RLSA-2026:70459RLSA-2026:70498RLSA-2026:70403RLSA-2026:70402

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-2026-68188 updated cvss 7.1

kernel: Linux kernel Bluetooth RFCOMM: Denial of Service via use-after-free in set_termios

  • 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 5.14.0-687.50.1.el9_8, perf 5.14.0-687.50.1.el9_8, rtla 5.14.0-687.50.1.el9_8, python3-perf 5.14.0-687.50.1.el9_8, kernel-devel-matched 5.14.0-687.50.1.el9_8, kernel-64k-devel-matched 5.14.0-687.50.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:70459
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.58.1.el10_2, perf 6.12.0-211.58.1.el10_2, rtla 6.12.0-211.58.1.el10_2, python3-perf 6.12.0-211.58.1.el10_2, kernel-devel-matched 6.12.0-211.58.1.el10_2, kernel-64k-devel-matched 6.12.0-211.58.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:70498
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.166.1.el8_10, kernel 4.18.0-553.166.1.el8_10, bpftool 4.18.0-553.166.1.el8_10, kernel-core 4.18.0-553.166.1.el8_10, kernel-tools 4.18.0-553.166.1.el8_10, python3-perf 4.18.0-553.166.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:70402
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.50.1.el9_8, kernel-64k 5.14.0-687.50.1.el9_8, kernel-core 5.14.0-687.50.1.el9_8, kernel-tools 5.14.0-687.50.1.el9_8, kernel-modules 5.14.0-687.50.1.el9_8, kernel-64k-core 5.14.0-687.50.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:70459
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.58.1.el10_2, kernel-64k 6.12.0-211.58.1.el10_2, kernel-core 6.12.0-211.58.1.el10_2, kernel-tools 6.12.0-211.58.1.el10_2, kernel-modules 6.12.0-211.58.1.el10_2, kernel-64k-core 6.12.0-211.58.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:70498
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.50.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.50.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.50.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.50.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.50.1.el9_8
    fixed: vendor fix RHSA-2026:70459
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.58.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.58.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.58.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.58.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.58.1.el10_2
    fixed: vendor fix RHSA-2026:70498
show 7 more
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.166.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.166.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.166.1.el8_10
    fixed: vendor fix RHSA-2026:70402
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-kvm 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-core 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-modules 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-debug-kvm 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-debug-core 4.18.0-553.166.1.rt7.507.el8_10, +4 more
    fixed: vendor fix RHSA-2026:70403
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.50.1.el9_8, kernel-rt-64k 5.14.0-687.50.1.el9_8, kernel-rt-core 5.14.0-687.50.1.el9_8, kernel-rt-modules 5.14.0-687.50.1.el9_8, kernel-rt-64k-core 5.14.0-687.50.1.el9_8, kernel-rt-debug-core 5.14.0-687.50.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:70459
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.58.1.el10_2, kernel-rt-64k 6.12.0-211.58.1.el10_2, kernel-rt-core 6.12.0-211.58.1.el10_2, kernel-rt-modules 6.12.0-211.58.1.el10_2, kernel-rt-64k-core 6.12.0-211.58.1.el10_2, kernel-rt-debug-core 6.12.0-211.58.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:70498
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.50.1.el9_8, kernel-rt-core 5.14.0-687.50.1.el9_8, kernel-rt-modules 5.14.0-687.50.1.el9_8, kernel-rt-debug-core 5.14.0-687.50.1.el9_8, kernel-rt-modules-core 5.14.0-687.50.1.el9_8, kernel-rt-debug-modules 5.14.0-687.50.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:70459
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.58.1.el10_2, kernel-rt-core 6.12.0-211.58.1.el10_2, kernel-rt-modules 6.12.0-211.58.1.el10_2, kernel-rt-debug-core 6.12.0-211.58.1.el10_2, kernel-rt-modules-core 6.12.0-211.58.1.el10_2, kernel-rt-debug-modules 6.12.0-211.58.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:70498
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-core 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-modules 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-debug-core 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-debug-modules 4.18.0-553.166.1.rt7.507.el8_10, kernel-rt-modules-extra 4.18.0-553.166.1.rt7.507.el8_10, +2 more
    fixed: vendor fix RHSA-2026:70403

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
partial
Assessed
2 d ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).

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.