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TI-2026-47980 Aliases CVE-2026-68201GHSA-793q-4mv8-rvwh

ALSA: timer: drain a slave's callback before its master detaches it

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
Fixed

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: timer: drain a slave's callback before its master detaches it snd_timer_close_locked() drains the closing instance's own in-flight callback (IFLG_CALLBACK) before freeing it, but not its slaves'. When a master instance is closed, remove_slave_links() clears each slave's ->timer; the slave's own close then reads timer == NULL and takes the branch that skips the drain entirely (snd_timer_stop_slave() also no-ops on a NULL timer). So a slave whose callback is still running when the master is closed is freed underneath the live callback, leading to use-after-free. Drain the slaves too before remove_slave_links() severs them. snd_timer_stop() has already taken this instance off the active list, so no new slave callback can be queued. Take the slaves off the ack list so a pending one can't fire either, then wait for any that is already in flight.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00171 6th percentileScored 2026-11-07
Fix Fixed Linux (Linux): 6.12.101, 6.18.42, 7.1.6 +1Red Hat: 2 advisories

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
LinuxLinux6.12 and later6.12.101, 6.18.42, 7.1.6, 7.2Patch availableCNA
  • Linux VendorLinux Affected 6.12 and later Fixed in 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 6.12.101, 6.18.42, 7.1.6, 7.2

Red Hat 2 advisories

  • RHSA-2026:71232 Released 2026-09-24 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-687.51.1.el9_8, kernel-64k-debug-devel-matched-5.14.0-687.51.1.el9_8, kernel-64k-devel-5.14.0-687.51.1.el9_8 +12
    • Red Hat Enterprise Linux BaseOS (v. 9) kernel-5.14.0-687.51.1.el9_8, kernel-64k-5.14.0-687.51.1.el9_8, kernel-64k-core-5.14.0-687.51.1.el9_8 +28
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-687.51.1.el9_8, libperf-5.14.0-687.51.1.el9_8
    • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-687.51.1.el9_8, kernel-rt-64k-5.14.0-687.51.1.el9_8, kernel-rt-64k-core-5.14.0-687.51.1.el9_8 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-687.51.1.el9_8, kernel-rt-core-5.14.0-687.51.1.el9_8, kernel-rt-debug-5.14.0-687.51.1.el9_8 +9
  • RHSA-2026:71233 Released 2026-09-24 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) kernel-64k-debug-devel-6.12.0-211.59.1.el10_2, kernel-64k-debug-devel-matched-6.12.0-211.59.1.el10_2, kernel-64k-devel-6.12.0-211.59.1.el10_2 +12
    • Red Hat Enterprise Linux BaseOS (v. 10) kernel-6.12.0-211.59.1.el10_2, kernel-64k-6.12.0-211.59.1.el10_2, kernel-64k-core-6.12.0-211.59.1.el10_2 +29
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) kernel-tools-libs-devel-6.12.0-211.59.1.el10_2, libperf-6.12.0-211.59.1.el10_2
    • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt-6.12.0-211.59.1.el10_2, kernel-rt-64k-6.12.0-211.59.1.el10_2, kernel-rt-64k-core-6.12.0-211.59.1.el10_2 +21
    • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt-6.12.0-211.59.1.el10_2, kernel-rt-core-6.12.0-211.59.1.el10_2, kernel-rt-debug-6.12.0-211.59.1.el10_2 +9

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:71233
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:71232
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:71233
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:71232
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:71233
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:71232
Red Hat Enterprise Linux Real Time (v. 10)Fixed RHSA-2026:71233
Red Hat Enterprise Linux Real Time (v. 9)Fixed RHSA-2026:71232
Red Hat Enterprise Linux Real Time for NFV (v. 10)Fixed RHSA-2026:71233
Red Hat Enterprise Linux Real Time for NFV (v. 9)Fixed RHSA-2026:71232
Not affected: 4 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-68201
  2. 2026-10-03 Alias added: GHSA-793q-4mv8-rvwh
  3. 2026-10-16 CISA SSVC decision points changed
  4. 2026-10-20 Weakness changed · CISA ADP
  5. 2026-10-29 Affected versions changed · Red Hat

References

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-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