CVE-2026-53193: ALSA: timer: Forcibly close timer instances at closing

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• linux linux kernel6.12 and later · before 6.12.94
• linux linux kernel6.13 and later · before 6.18.36
• linux linux kernel6.19 and later · before 7.0.13
• linux linux kernel7.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

• Linux Linux

  • 6.12affected
  • 37745918e0e7575bc40f38da93a99b9fa6406224 and later · before 586b219a22b1032b28b8bd356b963276c5e5bf53affected · git
  • 37745918e0e7575bc40f38da93a99b9fa6406224 and later · before f46093dd22969037beb1fce2e043f3236be41c92affected · git
  • 37745918e0e7575bc40f38da93a99b9fa6406224 and later · before 60e73ab87b84bbd6bd7ddd1d16019a3a3705ab8faffected · git
  • 37745918e0e7575bc40f38da93a99b9fa6406224 and later · before da3039e91d1f835874ed6e9a33ea19ee80c2cb92affected · git
  • before 6.12not affected · semver
  • 6.12.94 and later · up to and including 6.12.*not affected · semver
  • 6.18.36 and later · up to and including 6.18.*not affected · semver
  • 7.0.13 and later · up to and including 7.0.*not affected · semver
  • 7.1 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Other highest-scoring records for the same primary product.

• CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
  90Now
• CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
  89Now
• CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
  85Now

Published before and after this one in the same product

• ← EarlierCVE-2026-53191Jun 25, 2026 · io_uring/net: inherit IORING_CQE_F_BUF_MORE across bundle recv retries
  31Monitor
• ← EarlierCVE-2026-53192Jun 25, 2026 · ALSA: timer: Fix UAF at snd_timer_user_params()
  31Monitor
• Later →CVE-2026-53194Jun 25, 2026 · USB: serial: kl5kusb105: fix bulk-out buffer overflow
  31Monitor

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1free(dev->buf);2/* ... another thread is still running ... */3process(dev->buf);

1lock(&dev->lock);2free(dev->buf);3dev->buf = NULL;4unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.