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CVE-2026-98116

HIGH · CVSS 7.8 · Analyzed

Published: 2026-09-25 · Updated: 2026-10-28 · Source: NVD

Stored catalog record

Source record retrieved 2026-10-28T21:19:37.866740+00:00. Scheduled imports handle updates; this page does not assert that the provider was queried just now.

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Vulnerability overview

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 review priority

Assess exposure and vendor guidance

  • No higher-priority signal is available in the current stored evidence.

FIRST EPSS: 0.13% · percentile 2.3 · score date 2026-10-28.

EPSS estimates probability of exploitation in the next 30 days. It does not measure your exposure or prove exploitation. The elevated threshold is 10%; CISA KEV takes precedence. About FIRST EPSS ↗

Severity and scoring

CVSS score
7.8 · HIGH
CVSS version
3.1
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-416

CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.

Known exploitation and remediation

Not listed in the CISA catalog retrieved for this record. This does not establish that exploitation has not occurred.

Verify affected versions and patch availability in the vendor advisory before making changes.

Affected products and versions

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

    From (inclusive): 4.14.279

    Before (exclusive): 4.15

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

    From (inclusive): 4.19.243

    Before (exclusive): 4.20

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

    From (inclusive): 5.4.193

    Before (exclusive): 5.5

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

    From (inclusive): 5.10.109

    Before (exclusive): 5.11

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

    From (inclusive): 5.15.32

    Before (exclusive): 5.15.222

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

    From (inclusive): 5.16.18

    Through (inclusive): 5.17.1

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

    From (inclusive): 6.7

    Before (exclusive): 6.12.111

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

    From (inclusive): 6.13

    Before (exclusive): 6.18.53

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

    From (inclusive): 6.19

    Before (exclusive): 7.2.7

  • cpe:2.3:o:linux:linux_kernel:7.3:rc1:*:*:*:*:*:*

These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.

Advisories and references

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Read the official NVD record ↗

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