Read the docs
TI-2026-18628 Aliases CVE-2026-23191GHSA-x3gh-q355-f5px

ALSA: aloop: Fix racy access at PCM trigger

Priority LOW 35CWE-362Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 42 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

In the Linux kernel, the following vulnerability has been resolved: ALSA: aloop: Fix racy access at PCM trigger The PCM trigger callback of aloop driver tries to check the PCM state and stop the stream of the tied substream in the corresponding cable. Since both check and stop operations are performed outside the cable lock, this may result in UAF when a program attempts to trigger frequently while opening/closing the tied stream, as spotted by fuzzers. For addressing the UAF, this patch changes two things: - It covers the most of code in loopback_check_format() with cable->lock spinlock, and add the proper NULL checks. This avoids already some racy accesses. - In addition, now we try to check the state of the capture PCM stream that may be stopped in this function, which was the major pain point leading to UAF.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00133 2nd percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.270, 5.15.221, 6.1.188 +4Red Hat: 15 advisoriesRed Hat: 42 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux2.6.37 and later5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.70, 6.18.10, 6.19Patch availableCNA
  • Linux VendorLinux Affected 2.6.37 and later Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.70, 6.18.10, 6.19 Patch available CNA

CPE configurations NVD · 9

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*2.6.37 to before 6.12.70; 6.13 to before 6.18.10VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*6.19 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*6.19 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*6.19 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*6.19 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*6.19 rc5VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*6.19 rc6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*6.19 rc7VulnerableLinux
cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*6.19 rc8VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 2.6.37 to before 6.12.70; 6.13 to before 6.18.10 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:* Versions 6.19 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:* Versions 6.19 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:* Versions 6.19 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:* Versions 6.19 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:* Versions 6.19 rc5 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:* Versions 6.19 rc6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:* Versions 6.19 rc7 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:* Versions 6.19 rc8 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.70, 6.18.10, 6.19

Red Hat 15 advisories

  • RHSA-2026:34094 Released 2026-07-01 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) kernel-tools-libs-devel-5.14.0-570.125.1.el9_6, libperf-5.14.0-570.125.1.el9_6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) kernel-64k-debug-devel-5.14.0-570.125.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.125.1.el9_6, kernel-64k-devel-5.14.0-570.125.1.el9_6 +12
    • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel-5.14.0-570.125.1.el9_6, kernel-64k-5.14.0-570.125.1.el9_6, kernel-64k-core-5.14.0-570.125.1.el9_6 +28
    • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt-5.14.0-570.125.1.el9_6, kernel-rt-64k-5.14.0-570.125.1.el9_6, kernel-rt-64k-core-5.14.0-570.125.1.el9_6 +21
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6) kernel-rt-5.14.0-570.125.1.el9_6, kernel-rt-core-5.14.0-570.125.1.el9_6, kernel-rt-debug-5.14.0-570.125.1.el9_6 +11
  • RHSA-2026:26535 Released 2026-06-17 · Red Hat rating Critical
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.194.1.el8_4, kernel-4.18.0-305.194.1.el8_4, kernel-abi-stablelists-4.18.0-305.194.1.el8_4 +14
    • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.194.1.el8_4, kernel-4.18.0-305.194.1.el8_4, kernel-abi-stablelists-4.18.0-305.194.1.el8_4 +14
  • RHSA-2026:19521 Released 2026-05-20 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bpftool-4.18.0-477.143.1.el8_8, kernel-4.18.0-477.143.1.el8_8, kernel-abi-stablelists-4.18.0-477.143.1.el8_8 +14
    • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bpftool-4.18.0-477.143.1.el8_8, kernel-4.18.0-477.143.1.el8_8, kernel-abi-stablelists-4.18.0-477.143.1.el8_8 +14
Show 12 more Red Hat advisories
  • RHSA-2026:14925 Released 2026-05-07 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux Server (v. 7 ELS) bpftool-3.10.0-1160.149.1.el7, kernel-3.10.0-1160.149.1.el7, kernel-abi-whitelists-3.10.0-1160.149.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7 ELS) kernel-debug-devel-3.10.0-1160.149.1.el7, kernel-tools-libs-devel-3.10.0-1160.149.1.el7
  • RHSA-2026:14869 Released 2026-05-07 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt-3.10.0-1160.149.1.rt56.1301.el7, kernel-rt-debug-3.10.0-1160.149.1.rt56.1301.el7, kernel-rt-debug-devel-3.10.0-1160.149.1.rt56.1301.el7 +4
  • RHSA-2026:14301 Released 2026-05-06 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.169.1.rt14.454.el9_2, kernel-rt-core-5.14.0-284.169.1.rt14.454.el9_2, kernel-rt-debug-5.14.0-284.169.1.rt14.454.el9_2 +9
    • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt-5.14.0-284.169.1.rt14.454.el9_2, kernel-rt-core-5.14.0-284.169.1.rt14.454.el9_2, kernel-rt-debug-5.14.0-284.169.1.rt14.454.el9_2 +11
  • RHSA-2026:14230 Released 2026-05-06 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.191.1.el8_6, kernel-4.18.0-372.191.1.el8_6, kernel-abi-stablelists-4.18.0-372.191.1.el8_6 +14
    • Red Hat Enterprise Linux BaseOS E4S (v.8.6) bpftool-4.18.0-372.191.1.el8_6, kernel-4.18.0-372.191.1.el8_6, kernel-abi-stablelists-4.18.0-372.191.1.el8_6 +19
    • Red Hat Enterprise Linux BaseOS TUS (v.8.6) bpftool-4.18.0-372.191.1.el8_6, kernel-4.18.0-372.191.1.el8_6, kernel-abi-stablelists-4.18.0-372.191.1.el8_6 +14
  • RHSA-2026:14137 Released 2026-05-06 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt-5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-core-5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-debug-5.14.0-70.178.1.rt21.250.el9_0 +9
    • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt-5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-core-5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-debug-5.14.0-70.178.1.rt21.250.el9_0 +7
  • RHSA-2026:13932 Released 2026-05-06 · Red Hat rating Important
    kernel security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) kernel-tools-libs-devel-5.14.0-427.124.1.el9_4, libperf-5.14.0-427.124.1.el9_4
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) kernel-64k-debug-devel-5.14.0-427.124.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.124.1.el9_4, kernel-64k-devel-5.14.0-427.124.1.el9_4 +11
    • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool-7.3.0-427.124.1.el9_4, kernel-5.14.0-427.124.1.el9_4, kernel-64k-5.14.0-427.124.1.el9_4 +29
    • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt-5.14.0-427.124.1.el9_4, kernel-rt-core-5.14.0-427.124.1.el9_4, kernel-rt-debug-5.14.0-427.124.1.el9_4 +9
    • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) kernel-rt-5.14.0-427.124.1.el9_4, kernel-rt-core-5.14.0-427.124.1.el9_4, kernel-rt-debug-5.14.0-427.124.1.el9_4 +11
  • RHSA-2026:13936 Released 2026-05-06 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) kernel-debug-devel-5.14.0-70.178.1.el9_0, kernel-debug-devel-matched-5.14.0-70.178.1.el9_0, kernel-devel-5.14.0-70.178.1.el9_0 +5
    • Red Hat Enterprise Linux BaseOS E4S (v.9.0) bpftool-5.14.0-70.178.1.el9_0, kernel-5.14.0-70.178.1.el9_0, kernel-abi-stablelists-5.14.0-70.178.1.el9_0 +14
  • RHSA-2026:13734 Released 2026-05-05 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) kernel-64k-debug-devel-5.14.0-284.169.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.169.1.el9_2, kernel-64k-devel-5.14.0-284.169.1.el9_2 +10
    • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool-7.0.0-284.169.1.el9_2, kernel-5.14.0-284.169.1.el9_2, kernel-64k-5.14.0-284.169.1.el9_2 +29
  • RHSA-2026:9131 Released 2026-04-20 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.120.1.el8_10, kernel-4.18.0-553.120.1.el8_10, kernel-abi-stablelists-4.18.0-553.120.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.120.1.el8_10
  • RHSA-2026:9135 Released 2026-04-20 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.120.1.rt7.461.el8_10, kernel-rt-core-4.18.0-553.120.1.rt7.461.el8_10, kernel-rt-debug-4.18.0-553.120.1.rt7.461.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.120.1.rt7.461.el8_10, kernel-rt-core-4.18.0-553.120.1.rt7.461.el8_10, kernel-rt-debug-4.18.0-553.120.1.rt7.461.el8_10 +7
  • RHSA-2026:6632 Released 2026-04-06 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-124.49.1.el10_1, kernel-64k-debug-devel-matched-6.12.0-124.49.1.el10_1, kernel-64k-devel-6.12.0-124.49.1.el10_1 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-124.49.1.el10_1, kernel-64k-6.12.0-124.49.1.el10_1, kernel-64k-core-6.12.0-124.49.1.el10_1 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-124.49.1.el10_1, libperf-6.12.0-124.49.1.el10_1
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-124.49.1.el10_1, kernel-rt-64k-6.12.0-124.49.1.el10_1, kernel-rt-64k-core-6.12.0-124.49.1.el10_1 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-124.49.1.el10_1, kernel-rt-core-6.12.0-124.49.1.el10_1, kernel-rt-debug-6.12.0-124.49.1.el10_1 +9
  • RHSA-2026:6153 Released 2026-03-30 · Red Hat rating Moderate
    kernel security update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-611.45.1.el9_7, kernel-64k-debug-devel-matched-5.14.0-611.45.1.el9_7, kernel-64k-devel-5.14.0-611.45.1.el9_7 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-611.45.1.el9_7, kernel-64k-5.14.0-611.45.1.el9_7, kernel-64k-core-5.14.0-611.45.1.el9_7 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-611.45.1.el9_7, libperf-5.14.0-611.45.1.el9_7
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-611.45.1.el9_7, kernel-rt-64k-5.14.0-611.45.1.el9_7, kernel-rt-64k-core-5.14.0-611.45.1.el9_7 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-611.45.1.el9_7, kernel-rt-core-5.14.0-611.45.1.el9_7, kernel-rt-debug-5.14.0-611.45.1.el9_7 +9

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2026:13932
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:34094
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:6632
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:6153
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2026:13936
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:13734
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:13932
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:34094
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:6632
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:9131
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:6153
Red Hat Enterprise Linux BaseOS AUS (v.8.4)Fixed RHSA-2026:26535
Red Hat Enterprise Linux BaseOS AUS (v.8.6)Fixed RHSA-2026:14230
Red Hat Enterprise Linux BaseOS E4S (v.8.6)Fixed RHSA-2026:14230
Red Hat Enterprise Linux BaseOS E4S (v.8.8)Fixed RHSA-2026:19521
Red Hat Enterprise Linux BaseOS E4S (v.9.0)Fixed RHSA-2026:13936
Red Hat Enterprise Linux BaseOS E4S (v.9.2)Fixed RHSA-2026:13734
Red Hat Enterprise Linux BaseOS EUS (v.9.4)Fixed RHSA-2026:13932
Red Hat Enterprise Linux BaseOS EUS (v.9.6)Fixed RHSA-2026:34094
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)Fixed RHSA-2026:26535
Red Hat Enterprise Linux BaseOS TUS (v.8.6)Fixed RHSA-2026:14230
Red Hat Enterprise Linux BaseOS TUS (v.8.8)Fixed RHSA-2026:19521
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:9131
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:6632
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:6153
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:9135
Red Hat Enterprise Linux NFV E4S (v.9.0)Fixed RHSA-2026:14137
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:9135
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:6632
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:6153
Red Hat Enterprise Linux Real Time E4S (v.9.0)Fixed RHSA-2026:14137
Red Hat Enterprise Linux Real Time E4S (v.9.2)Fixed RHSA-2026:14301
Red Hat Enterprise Linux Real Time EUS (v.9.4)Fixed RHSA-2026:13932
Red Hat Enterprise Linux Real Time EUS (v.9.6)Fixed RHSA-2026:34094
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:6632
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:6153
Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)Fixed RHSA-2026:14301
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4)Fixed RHSA-2026:13932
Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)Fixed RHSA-2026:34094
Red Hat Enterprise Linux Server (v. 7 ELS)Fixed RHSA-2026:14925
Red Hat Enterprise Linux Server Optional (v. 7 ELS)Fixed RHSA-2026:14925
Red Hat Enterprise Linux for Real Time (v. 7 ELS)Fixed RHSA-2026:14869
Not affected: 1 product
  • Red Hat Enterprise Linux 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-23191
  2. 2026-10-03 Alias added: GHSA-x3gh-q355-f5px
  3. 2026-10-19 Weakness changed · CISA ADP

References

Patch 3

Other 4

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences