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TI-2026-47981 Aliases CVE-2026-68202GHSA-62fv-xj62-4r9q

ALSA: seq: close a re-opened queue timer in the destructor

Priority LOW 35CWE-416Published · 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: 16 fixed, 5 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: seq: close a re-opened queue timer in the destructor queue_delete() closes the queue timer, then frees it. snd_seq_timer_close() clears q->timer->timeri. snd_use_lock_sync() then drains borrowers, and snd_seq_timer_delete() frees q->timer. A borrower can re-open the timer inside that window. A SET_QUEUE_CLIENT that took a queueptr() use_lock reference before the queue was unlinked runs snd_seq_timer_open() after the close. Open refuses re-open only while timeri is set, and the close just cleared it, so it re-opens timeri. snd_seq_timer_delete() does not close that instance. Its snd_seq_timer_stop() is a no-op, because running was cleared first. So it frees q->timer with the instance still live. The queue is freed next. The instance stays on the global timer with callback_data pointing at the freed queue. A non-owner START on the unlocked queue arms it. The next tick derefs the freed queue in snd_seq_timer_interrupt(). Reachable by an unprivileged user with access to /dev/snd/seq. No CAP and no queue ownership required. Close any lingering instance in the destructor. There, ->timeri can no longer change: the queue is unlinked and all use_lock borrowers have drained, so no snd_seq_queue_use() can re-open it. Close it before clearing q->timer. snd_timer_close() waits for any in-flight snd_seq_timer_interrupt() to finish, and that callback still reads q->timer (via snd_seq_check_queue()), so q->timer must stay valid until it drains.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00177 7th percentileScored 2026-11-07
Fix Partial Linux (Linux): 5.10.266, 5.15.217, 6.1.183 +5Red Hat: 4 advisoriesRed Hat: 16 fixed, 5 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
LinuxLinux2.6.12 and later5.10.266, 5.15.217, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6, 7.2Patch availableCNA
  • Linux VendorLinux Affected 2.6.12 and later Fixed in 5.10.266, 5.15.217, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6, 7.2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*——Linux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions — — ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 5.10.266, 5.15.217, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6, 7.2

Red Hat 4 advisories

  • RHSA-2026:88477 Released 2026-10-23 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • 10Base-SMTV kernel-modules-internal-6.12.0-211.68.1.el10_2
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.68.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.68.1.el10_2, kernel-64k-devel-6.12.0-211.68.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.68.1.el10_2, kernel-64k-6.12.0-211.68.1.el10_2, kernel-64k-core-6.12.0-211.68.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.68.1.el10_2, libperf-6.12.0-211.68.1.el10_2
    • Red Hat Enterprise Linux Hidden (v. 10) kernel-modules-internal-6.12.0-211.68.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.68.1.el10_2, kernel-rt-64k-6.12.0-211.68.1.el10_2, kernel-rt-64k-core-6.12.0-211.68.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.68.1.el10_2, kernel-rt-core-6.12.0-211.68.1.el10_2, kernel-rt-debug-6.12.0-211.68.1.el10_2 +9
  • RHSA-2026:87805 Released 2026-10-22 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.60.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.60.1.el9_8, kernel-64k-devel-5.14.0-687.60.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.60.1.el9_8, kernel-64k-5.14.0-687.60.1.el9_8, kernel-64k-core-5.14.0-687.60.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.60.1.el9_8, libperf-5.14.0-687.60.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.60.1.el9_8, kernel-rt-64k-5.14.0-687.60.1.el9_8, kernel-rt-64k-core-5.14.0-687.60.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.60.1.el9_8, kernel-rt-core-5.14.0-687.60.1.el9_8, kernel-rt-debug-5.14.0-687.60.1.el9_8 +9
  • RHSA-2026:87375 Released 2026-10-21 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.177.1.el8_10, kernel-4.18.0-553.177.1.el8_10, kernel-abi-stablelists-4.18.0-553.177.1.el8_10 +19
    • Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.177.1.el8_10
Show 1 more Red Hat advisories
  • RHSA-2026:87374 Released 2026-10-21 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.177.1.rt7.518.el8_10, kernel-rt-core-4.18.0-553.177.1.rt7.518.el8_10, kernel-rt-debug-4.18.0-553.177.1.rt7.518.el8_10 +9
    • Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.177.1.rt7.518.el8_10, kernel-rt-core-4.18.0-553.177.1.rt7.518.el8_10, kernel-rt-debug-4.18.0-553.177.1.rt7.518.el8_10 +7

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 6Affected—
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat Enterprise Linux 9AffectedNo fix yet
Red Hat OpenShift Container Platform 4AffectedNo fix yet: Fix deferred
Red Hat OpenShift Container Platform 5AffectedNo fix yet: Fix deferred
10Base-SMTVFixed RHSA-2026:88477
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:88477
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:87805
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:88477
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:87375
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:87805
Red Hat Enterprise Linux CRB (v. 8)Fixed RHSA-2026:87375
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:88477
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:87805
Red Hat Enterprise Linux Hidden (v. 10)Fixed RHSA-2026:88477
Red Hat Enterprise Linux NFV (v. 8)Fixed RHSA-2026:87374
Red Hat Enterprise Linux RT (v. 8)Fixed RHSA-2026:87374
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:88477
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:87805
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:88477
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:87805
Not affected: 2 products
  • Red Hat Enterprise Linux for NVIDIA 26
  • Red Hat OpenShift Container Platform 4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-68202
  2. 2026-10-03 Alias added: GHSA-62fv-xj62-4r9q
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-20 Weakness changed · CISA ADP
  5. 2026-10-22 Fix available: RHSA-2026:87374 · Red Hat
  6. 2026-10-22 Fix available: RHSA-2026:87375 · Red Hat
  7. 2026-10-23 Fix available: RHSA-2026:87805 · Red Hat
  8. 2026-10-23 Fix available: RHSA-2026:88477 · Red Hat
  9. 2026-10-23 Fix available: 10Base-SMTV, Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream (v. 9) +13 · Red Hat
  10. 2026-10-30 Affected versions changed · Red Hat

References

Other 8

  • 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-2021-02452 Incorrect authorization in Ubuntu linux kernel 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
See all 21741 →

Sources

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