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high 7.8

CVE-2026-98116 json

ALSA: pcm: Serialize PCM mmap with buffer reallocation to fix page UAF

published last mo. modified 14d ago also EUVD-2026-86947

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 2%
public exploits
0
none known

Summary

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

ALSA: pcm: Serialize PCM mmap with buffer reallocation to fix page UAF

snd_pcm_hw_params() and snd_pcm_hw_free() guard buffer reallocation with an mmap_count check performed under the PCM stream lock, but the lock is released long before the buffer is actually freed: snd_pcm_sync_stop(), constraint refinement and do_free_pages() all happen in between. snd_pcm_mmap_data(), on the other hand, takes no lock at all: it validates against the old buffer's state and dma_bytes, remaps its pages into the VMA, and only then increments mmap_count.

A concurrent mmap() can therefore slip in between the check and the free. remap_pfn_range() installs writable PTEs for the old buffer's pages without taking page references, and the subsequent do_free_pages() returns those pages to the page allocator while the VMA still maps them. This leaves a stale, writable mapping of freed pages: a page-level use-after-free that can be leveraged for local privilege escalation.

Make snd_pcm_mmap_data() participate in the buffer-access scheme introduced for hw_params/hw_free: acquire runtime->buffer_accessing before validating and remapping, and release it afterwards. Buffer reallocation already fails with -EBUSY while accessors are active, and the mmap side now fails with -EBUSY while a reallocation is in progress, so the validate/remap sequence and the check/free sequence can no longer interleave.

A reproducer that turns this race into a stale writable mapping of the freed DMA buffer pages is available on request.

Patch / fix

  • Linux Linux 4.15, 4.20, 5.5, 5.11, 5.15.222, 5.17, 5.18, 6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.2.7, 7.3
  • linux Debian 12 6.1.190-1
  • linux Debian 13 6.12.111-1
  • linux Debian 14 7.2.7-1
  • linux-6.12 Debian 12 6.12.111-1~deb12u1

debian advisories DEBIAN-CVE-2026-98116

  • linux Ubuntu 22.04 LTS 5.15.0-202.212
  • linux Ubuntu 24.04 LTS 6.8.0-149.149
  • linux Ubuntu 26.04 LTS 7.0.0-42.42
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1119.126
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1069.74
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1016.17
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1120.130
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1073.81

ubuntu advisories UBUNTU-CVE-2026-98116

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-source Linux Micro 6.0 6.4.0-159998.55.1
  • kernel-default Linux Micro 6.0 6.4.0-159998.55.1
  • kernel-kvmsmall Linux Micro 6.0 6.4.0-159998.55.1
  • kernel-default-base Linux Micro 6.0 6.4.0-159998.55.1.159998.21.42
  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.90.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.90.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.90.1
  • kernel-source SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 6.4.0-150700.53.90.1

suse advisories SUSE-SU-2026:5121-1SUSE-SU-2026:24550-1SUSE-SU-2026:5091-1

  • kernel-source openSUSE Tumbleweed 7.2.9-1.1

opensuse advisories openSUSE-SU-2026:12074-1

  • kernel Azure Linux 3.0 6.6.158.1-1

azure linux advisories AZL-104598

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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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-2026-98116 updated cvss 7.8

kernel: ALSA: pcm: Serialize PCM mmap with buffer reallocation to fix page UAF

  • 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 Red Hat Enterprise Linux 10 kernel
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-741.22.1.el9_9, perf 5.14.0-741.22.1.el9_9, rtla 5.14.0-741.22.1.el9_9, python3-perf 5.14.0-741.22.1.el9_9, kernel-devel-matched 5.14.0-741.22.1.el9_9, kernel-64k-devel-matched 5.14.0-741.22.1.el9_9, +7 more
    fixed: vendor fix RHSA-2026:99135
  • Red Hat Enterprise Linux AppStream EUS (v.9.8) rv 5.14.0-687.67.1.el9_8, perf 5.14.0-687.67.1.el9_8, rtla 5.14.0-687.67.1.el9_8, python3-perf 5.14.0-687.67.1.el9_8, kernel-devel-matched 5.14.0-687.67.1.el9_8, kernel-64k-devel-matched 5.14.0-687.67.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:99148
  • Red Hat Enterprise Linux AppStream EUS (v.10.2) rv 6.12.0-211.75.1.el10_2, perf 6.12.0-211.75.1.el10_2, rtla 6.12.0-211.75.1.el10_2, python3-perf 6.12.0-211.75.1.el10_2, kernel-devel-matched 6.12.0-211.75.1.el10_2, kernel-64k-devel-matched 6.12.0-211.75.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:99139
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.185.1.el8_10, kernel 4.18.0-553.185.1.el8_10, bpftool 4.18.0-553.185.1.el8_10, kernel-core 4.18.0-553.185.1.el8_10, kernel-tools 4.18.0-553.185.1.el8_10, python3-perf 4.18.0-553.185.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:98099
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-741.22.1.el9_9, kernel-64k 5.14.0-741.22.1.el9_9, kernel-core 5.14.0-741.22.1.el9_9, kernel-tools 5.14.0-741.22.1.el9_9, kernel-modules 5.14.0-741.22.1.el9_9, kernel-64k-core 5.14.0-741.22.1.el9_9, +27 more
    fixed: vendor fix RHSA-2026:99135
  • Red Hat Enterprise Linux BaseOS EUS (v.9.8) kernel 5.14.0-687.67.1.el9_8, kernel-64k 5.14.0-687.67.1.el9_8, kernel-core 5.14.0-687.67.1.el9_8, kernel-tools 5.14.0-687.67.1.el9_8, kernel-modules 5.14.0-687.67.1.el9_8, kernel-64k-core 5.14.0-687.67.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:99148
  • Red Hat Enterprise Linux BaseOS EUS (v.10.2) kernel 6.12.0-211.75.1.el10_2, kernel-64k 6.12.0-211.75.1.el10_2, kernel-core 6.12.0-211.75.1.el10_2, kernel-tools 6.12.0-211.75.1.el10_2, kernel-modules 6.12.0-211.75.1.el10_2, kernel-64k-core 6.12.0-211.75.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:99139
show 13 more
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-741.22.1.el9_9, kernel-debuginfo-common-s390x 5.14.0-741.22.1.el9_9, kernel-debuginfo-common-x86_64 5.14.0-741.22.1.el9_9, kernel-debuginfo-common-aarch64 5.14.0-741.22.1.el9_9, kernel-debuginfo-common-ppc64le 5.14.0-741.22.1.el9_9
    fixed: vendor fix RHSA-2026:99135
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v.9.8) libperf 5.14.0-687.67.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.67.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.67.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.67.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.67.1.el9_8
    fixed: vendor fix RHSA-2026:99148
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v.10.2) libperf 6.12.0-211.75.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.75.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.75.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.75.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.75.1.el10_2
    fixed: vendor fix RHSA-2026:99139
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.185.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.185.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.185.1.el8_10
    fixed: vendor fix RHSA-2026:98099
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.185.1.rt7.526.el8_10, kernel-rt-kvm 4.18.0-553.185.1.rt7.526.el8_10, kernel-rt-core 4.18.0-553.185.1.rt7.526.el8_10, kernel-rt-modules 4.18.0-553.185.1.rt7.526.el8_10, kernel-rt-debug-kvm 4.18.0-553.185.1.rt7.526.el8_10, kernel-rt-debug-core 4.18.0-553.185.1.rt7.526.el8_10, +4 more
    fixed: vendor fix RHSA-2026:98100
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-741.22.1.el9_9, kernel-rt-64k 5.14.0-741.22.1.el9_9, kernel-rt-core 5.14.0-741.22.1.el9_9, kernel-rt-modules 5.14.0-741.22.1.el9_9, kernel-rt-64k-core 5.14.0-741.22.1.el9_9, kernel-rt-debug-core 5.14.0-741.22.1.el9_9, +14 more
    fixed: vendor fix RHSA-2026:99135
  • Red Hat Enterprise Linux Real Time EUS (v.9.8) kernel-rt 5.14.0-687.67.1.el9_8, kernel-rt-64k 5.14.0-687.67.1.el9_8, kernel-rt-core 5.14.0-687.67.1.el9_8, kernel-rt-modules 5.14.0-687.67.1.el9_8, kernel-rt-64k-core 5.14.0-687.67.1.el9_8, kernel-rt-debug-core 5.14.0-687.67.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:99148
  • Red Hat Enterprise Linux Real Time EUS (v.10.2) kernel-rt 6.12.0-211.75.1.el10_2, kernel-rt-64k 6.12.0-211.75.1.el10_2, kernel-rt-core 6.12.0-211.75.1.el10_2, kernel-rt-modules 6.12.0-211.75.1.el10_2, kernel-rt-64k-core 6.12.0-211.75.1.el10_2, kernel-rt-debug-core 6.12.0-211.75.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:99139
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-741.22.1.el9_9, kernel-rt-core 5.14.0-741.22.1.el9_9, kernel-rt-modules 5.14.0-741.22.1.el9_9, kernel-rt-debug-core 5.14.0-741.22.1.el9_9, kernel-rt-modules-core 5.14.0-741.22.1.el9_9, kernel-rt-debug-modules 5.14.0-741.22.1.el9_9, +5 more
    fixed: vendor fix RHSA-2026:99135
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.8) kernel-rt 5.14.0-687.67.1.el9_8, kernel-rt-core 5.14.0-687.67.1.el9_8, kernel-rt-modules 5.14.0-687.67.1.el9_8, kernel-rt-debug-core 5.14.0-687.67.1.el9_8, kernel-rt-modules-core 5.14.0-687.67.1.el9_8, kernel-rt-debug-modules 5.14.0-687.67.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:99148
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.10.2) kernel-rt 6.12.0-211.75.1.el10_2, kernel-rt-core 6.12.0-211.75.1.el10_2, kernel-rt-modules 6.12.0-211.75.1.el10_2, kernel-rt-debug-core 6.12.0-211.75.1.el10_2, kernel-rt-modules-core 6.12.0-211.75.1.el10_2, kernel-rt-debug-modules 6.12.0-211.75.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:99139
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.185.1.rt7.526.el8_10, kernel-rt-core 4.18.0-553.185.1.rt7.526.el8_10, kernel-rt-modules 4.18.0-553.185.1.rt7.526.el8_10, kernel-rt-debug-core 4.18.0-553.185.1.rt7.526.el8_10, kernel-rt-debug-modules 4.18.0-553.185.1.rt7.526.el8_10, kernel-rt-modules-extra 4.18.0-553.185.1.rt7.526.el8_10, +2 more
    fixed: vendor fix RHSA-2026:98100
  • 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
    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

Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-11).

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
Technology feeds

References

Sources

Fencer Intel 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.