CVE-2026-64029 (GCVE-0-2026-64029)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-07-20 13:42
VLAI
Title
ALSA: seq: Serialize UMP output teardown with event_input
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: seq: Serialize UMP output teardown with event_input seq_ump_process_event() borrows client->out_rfile.output without synchronizing with the first-open and last-close transition in seq_ump_client_open() and seq_ump_client_close(). The last output unuse can therefore drop opened[STR_OUT] to zero and release the rawmidi file while an in-flight event_input callback is still inside snd_rawmidi_kernel_write(). That leaves the rawmidi substream runtime exposed to teardown before the write path has taken its own buffer reference. Add a per-client rwlock for the event_input-visible output file. Publish a newly opened output file under the write side, and hold the read side from the output lookup through snd_rawmidi_kernel_write(). The last output close copies and clears the visible output file under the write side, then drops the lock and releases the saved rawmidi file. Use IRQ-safe rwlock guards because event_input can also be reached from atomic sequencer delivery. The buggy scenario involves two paths, with each column showing the order within that path: path A label: event_input path path B label: last unuse path 1. seq_ump_process_event() reads 1. seq_ump_client_close() client->out_rfile.output. drops opened[STR_OUT] to zero. 2. snd_rawmidi_kernel_write1() 2. snd_rawmidi_kernel_release() has not yet pinned runtime. closes the output file. 3. The writer continues using 3. close_substream() frees the borrowed substream. substream->runtime. This keeps the output substream and runtime alive for the full event_input write while keeping rawmidi release outside the rwlock. KASAN reproduced this as a slab-use-after-free in snd_rawmidi_kernel_write1(), with allocation through seq_ump_use()/snd_seq_port_connect() and free through seq_ump_unuse()/snd_seq_port_disconnect(). Validation reproduced this kernel report: KASAN slab-use-after-free in snd_rawmidi_kernel_write1+0x9d/0x400 RIP: 0033:0x7f5528af837f Read of size 8 Call trace: dump_stack_lvl+0x73/0xb0 (?:?) print_report+0xd1/0x650 (?:?) srso_alias_return_thunk+0x5/0xfbef5 (?:?) __virt_addr_valid+0x1a7/0x340 (?:?) kasan_complete_mode_report_info+0x64/0x200 (?:?) kasan_report+0xf7/0x130 (?:?) snd_rawmidi_kernel_write1+0x9d/0x400 (?:?) __asan_load8+0x82/0xb0 (?:?) update_stack_state+0x1ef/0x2d0 (?:?) snd_rawmidi_kernel_write+0x1a/0x20 (?:?) seq_ump_process_event+0xd4/0x120 (sound/core/seq/seq_ump_client.c:82) __snd_seq_deliver_single_event+0x8a/0xe0 (?:?) snd_seq_deliver_from_ump+0x2b2/0xd60 (?:?) lock_acquire+0x14e/0x2e0 (?:?) find_held_lock+0x31/0x90 (?:?) snd_seq_port_use_ptr+0xa6/0xe0 (?:?) __kasan_check_write+0x18/0x20 (?:?) do_raw_read_unlock+0x32/0xa0 (?:?) _raw_read_unlock+0x26/0x50 (?:?) snd_seq_deliver_single_event+0x45c/0x4b0 (?:?) snd_seq_deliver_event+0x10d/0x1b0 (?:?) snd_seq_client_enqueue_event+0x192/0x240 (?:?) snd_seq_write+0x2cd/0x450 (?:?) apparmor_file_permission+0x20/0x30 (?:?) security_file_permission+0x51/0x60 (?:?) vfs_write+0x1ce/0x850 (?:?) __fget_files+0x12b/0x220 (?:?) lock_release+0xc8/0x2a0 (?:?) __rcu_read_unlock+0x74/0x2d0 (?:?) __fget_files+0x135/0x220 (?:?) ksys_write+0x15a/0x180 (?:?) rcu_is_watching+0x24/0x60 (?:?) __x64_sys_write+0x46/0x60 (?:?) x64_sys_call+0x7d/0x20d0 (?:?) do_syscall_64+0xc1/0x360 (arch/x86/entry/syscall_64.c:87) entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 81fd444aa371261cd33f31d4ffd80faeeeab0cc9 , < 8ba1c4ddbb1c67d34bb440aecb9f5690ed3f64cb (git)
Affected: 81fd444aa371261cd33f31d4ffd80faeeeab0cc9 , < 0cb1ad795570167558530d6194297ac2396a1991 (git)
Affected: 81fd444aa371261cd33f31d4ffd80faeeeab0cc9 , < 3aab4a58d23fb22dac5b558bbe5df1a8dad00b4b (git)
Affected: 81fd444aa371261cd33f31d4ffd80faeeeab0cc9 , < ef46b616a4c219185bbf10ebcbacb571583fd0e4 (git)
Affected: 81fd444aa371261cd33f31d4ffd80faeeeab0cc9 , < 60a1969fae6209644698fca91c185d153674f631 (git)
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Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/core/seq/seq_ump_client.c"
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          "vendor": "Linux",
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              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
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        }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: seq: Serialize UMP output teardown with event_input\n\nseq_ump_process_event() borrows client-\u003eout_rfile.output without\nsynchronizing with the first-open and last-close transition in\nseq_ump_client_open() and seq_ump_client_close().\n\nThe last output unuse can therefore drop opened[STR_OUT] to zero and\nrelease the rawmidi file while an in-flight event_input callback is still\ninside snd_rawmidi_kernel_write(). That leaves the rawmidi substream\nruntime exposed to teardown before the write path has taken its own\nbuffer reference.\n\nAdd a per-client rwlock for the event_input-visible output file. Publish\na newly opened output file under the write side, and hold the read side\nfrom the output lookup through snd_rawmidi_kernel_write(). The last\noutput close copies and clears the visible output file under the write\nside, then drops the lock and releases the saved rawmidi file. Use\nIRQ-safe rwlock guards because event_input can also be reached from\natomic sequencer delivery.\n\nThe buggy scenario involves two paths, with each column showing the\norder within that path:\n\npath A label: event_input path         path B label: last unuse path\n1. seq_ump_process_event() reads       1. seq_ump_client_close()\n   client-\u003eout_rfile.output.              drops opened[STR_OUT] to zero.\n2. snd_rawmidi_kernel_write1()         2. snd_rawmidi_kernel_release()\n   has not yet pinned runtime.            closes the output file.\n3. The writer continues using          3. close_substream() frees\n   the borrowed substream.                substream-\u003eruntime.\n\nThis keeps the output substream and runtime alive for the full\nevent_input write while keeping rawmidi release outside the rwlock.\n\nKASAN reproduced this as a slab-use-after-free in\nsnd_rawmidi_kernel_write1(), with allocation through\nseq_ump_use()/snd_seq_port_connect() and free through\nseq_ump_unuse()/snd_seq_port_disconnect().\n\n\nValidation reproduced this kernel report:\nKASAN slab-use-after-free in snd_rawmidi_kernel_write1+0x9d/0x400\nRIP: 0033:0x7f5528af837f\nRead of size 8\nCall trace:\n  dump_stack_lvl+0x73/0xb0 (?:?)\n  print_report+0xd1/0x650 (?:?)\n  srso_alias_return_thunk+0x5/0xfbef5 (?:?)\n  __virt_addr_valid+0x1a7/0x340 (?:?)\n  kasan_complete_mode_report_info+0x64/0x200 (?:?)\n  kasan_report+0xf7/0x130 (?:?)\n  snd_rawmidi_kernel_write1+0x9d/0x400 (?:?)\n  __asan_load8+0x82/0xb0 (?:?)\n  update_stack_state+0x1ef/0x2d0 (?:?)\n  snd_rawmidi_kernel_write+0x1a/0x20 (?:?)\n  seq_ump_process_event+0xd4/0x120 (sound/core/seq/seq_ump_client.c:82)\n  __snd_seq_deliver_single_event+0x8a/0xe0 (?:?)\n  snd_seq_deliver_from_ump+0x2b2/0xd60 (?:?)\n  lock_acquire+0x14e/0x2e0 (?:?)\n  find_held_lock+0x31/0x90 (?:?)\n  snd_seq_port_use_ptr+0xa6/0xe0 (?:?)\n  __kasan_check_write+0x18/0x20 (?:?)\n  do_raw_read_unlock+0x32/0xa0 (?:?)\n  _raw_read_unlock+0x26/0x50 (?:?)\n  snd_seq_deliver_single_event+0x45c/0x4b0 (?:?)\n  snd_seq_deliver_event+0x10d/0x1b0 (?:?)\n  snd_seq_client_enqueue_event+0x192/0x240 (?:?)\n  snd_seq_write+0x2cd/0x450 (?:?)\n  apparmor_file_permission+0x20/0x30 (?:?)\n  security_file_permission+0x51/0x60 (?:?)\n  vfs_write+0x1ce/0x850 (?:?)\n  __fget_files+0x12b/0x220 (?:?)\n  lock_release+0xc8/0x2a0 (?:?)\n  __rcu_read_unlock+0x74/0x2d0 (?:?)\n  __fget_files+0x135/0x220 (?:?)\n  ksys_write+0x15a/0x180 (?:?)\n  rcu_is_watching+0x24/0x60 (?:?)\n  __x64_sys_write+0x46/0x60 (?:?)\n  x64_sys_call+0x7d/0x20d0 (?:?)\n  do_syscall_64+0xc1/0x360 (arch/x86/entry/syscall_64.c:87)\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-20T13:42:32.790Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8ba1c4ddbb1c67d34bb440aecb9f5690ed3f64cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/0cb1ad795570167558530d6194297ac2396a1991"
        },
        {
          "url": "https://git.kernel.org/stable/c/3aab4a58d23fb22dac5b558bbe5df1a8dad00b4b"
        },
        {
          "url": "https://git.kernel.org/stable/c/ef46b616a4c219185bbf10ebcbacb571583fd0e4"
        },
        {
          "url": "https://git.kernel.org/stable/c/60a1969fae6209644698fca91c185d153674f631"
        }
      ],
      "title": "ALSA: seq: Serialize UMP output teardown with event_input",
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64029",
    "datePublished": "2026-07-19T15:39:20.368Z",
    "dateReserved": "2026-07-19T07:54:57.028Z",
    "dateUpdated": "2026-07-20T13:42:32.790Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64029",
      "date": "2026-07-21",
      "epss": "0.00125",
      "percentile": "0.02592"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64029\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T16:17:42.997\",\"lastModified\":\"2026-07-20T15:17:03.700\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nALSA: seq: Serialize UMP output teardown with event_input\\n\\nseq_ump_process_event() borrows client-\u003eout_rfile.output without\\nsynchronizing with the first-open and last-close transition in\\nseq_ump_client_open() and seq_ump_client_close().\\n\\nThe last output unuse can therefore drop opened[STR_OUT] to zero and\\nrelease the rawmidi file while an in-flight event_input callback is still\\ninside snd_rawmidi_kernel_write(). That leaves the rawmidi substream\\nruntime exposed to teardown before the write path has taken its own\\nbuffer reference.\\n\\nAdd a per-client rwlock for the event_input-visible output file. Publish\\na newly opened output file under the write side, and hold the read side\\nfrom the output lookup through snd_rawmidi_kernel_write(). The last\\noutput close copies and clears the visible output file under the write\\nside, then drops the lock and releases the saved rawmidi file. Use\\nIRQ-safe rwlock guards because event_input can also be reached from\\natomic sequencer delivery.\\n\\nThe buggy scenario involves two paths, with each column showing the\\norder within that path:\\n\\npath A label: event_input path         path B label: last unuse path\\n1. seq_ump_process_event() reads       1. seq_ump_client_close()\\n   client-\u003eout_rfile.output.              drops opened[STR_OUT] to zero.\\n2. snd_rawmidi_kernel_write1()         2. snd_rawmidi_kernel_release()\\n   has not yet pinned runtime.            closes the output file.\\n3. The writer continues using          3. close_substream() frees\\n   the borrowed substream.                substream-\u003eruntime.\\n\\nThis keeps the output substream and runtime alive for the full\\nevent_input write while keeping rawmidi release outside the rwlock.\\n\\nKASAN reproduced this as a slab-use-after-free in\\nsnd_rawmidi_kernel_write1(), with allocation through\\nseq_ump_use()/snd_seq_port_connect() and free through\\nseq_ump_unuse()/snd_seq_port_disconnect().\\n\\n\\nValidation reproduced this kernel report:\\nKASAN slab-use-after-free in snd_rawmidi_kernel_write1+0x9d/0x400\\nRIP: 0033:0x7f5528af837f\\nRead of size 8\\nCall trace:\\n  dump_stack_lvl+0x73/0xb0 (?:?)\\n  print_report+0xd1/0x650 (?:?)\\n  srso_alias_return_thunk+0x5/0xfbef5 (?:?)\\n  __virt_addr_valid+0x1a7/0x340 (?:?)\\n  kasan_complete_mode_report_info+0x64/0x200 (?:?)\\n  kasan_report+0xf7/0x130 (?:?)\\n  snd_rawmidi_kernel_write1+0x9d/0x400 (?:?)\\n  __asan_load8+0x82/0xb0 (?:?)\\n  update_stack_state+0x1ef/0x2d0 (?:?)\\n  snd_rawmidi_kernel_write+0x1a/0x20 (?:?)\\n  seq_ump_process_event+0xd4/0x120 (sound/core/seq/seq_ump_client.c:82)\\n  __snd_seq_deliver_single_event+0x8a/0xe0 (?:?)\\n  snd_seq_deliver_from_ump+0x2b2/0xd60 (?:?)\\n  lock_acquire+0x14e/0x2e0 (?:?)\\n  find_held_lock+0x31/0x90 (?:?)\\n  snd_seq_port_use_ptr+0xa6/0xe0 (?:?)\\n  __kasan_check_write+0x18/0x20 (?:?)\\n  do_raw_read_unlock+0x32/0xa0 (?:?)\\n  _raw_read_unlock+0x26/0x50 (?:?)\\n  snd_seq_deliver_single_event+0x45c/0x4b0 (?:?)\\n  snd_seq_deliver_event+0x10d/0x1b0 (?:?)\\n  snd_seq_client_enqueue_event+0x192/0x240 (?:?)\\n  snd_seq_write+0x2cd/0x450 (?:?)\\n  apparmor_file_permission+0x20/0x30 (?:?)\\n  security_file_permission+0x51/0x60 (?:?)\\n  vfs_write+0x1ce/0x850 (?:?)\\n  __fget_files+0x12b/0x220 (?:?)\\n  lock_release+0xc8/0x2a0 (?:?)\\n  __rcu_read_unlock+0x74/0x2d0 (?:?)\\n  __fget_files+0x135/0x220 (?:?)\\n  ksys_write+0x15a/0x180 (?:?)\\n  rcu_is_watching+0x24/0x60 (?:?)\\n  __x64_sys_write+0x46/0x60 (?:?)\\n  x64_sys_call+0x7d/0x20d0 (?:?)\\n  do_syscall_64+0xc1/0x360 (arch/x86/entry/syscall_64.c:87)\\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"sound/core/seq/seq_ump_client.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"81fd444aa371261cd33f31d4ffd80faeeeab0cc9\",\"lessThan\":\"8ba1c4ddbb1c67d34bb440aecb9f5690ed3f64cb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"81fd444aa371261cd33f31d4ffd80faeeeab0cc9\",\"lessThan\":\"0cb1ad795570167558530d6194297ac2396a1991\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"81fd444aa371261cd33f31d4ffd80faeeeab0cc9\",\"lessThan\":\"3aab4a58d23fb22dac5b558bbe5df1a8dad00b4b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"81fd444aa371261cd33f31d4ffd80faeeeab0cc9\",\"lessThan\":\"ef46b616a4c219185bbf10ebcbacb571583fd0e4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"81fd444aa371261cd33f31d4ffd80faeeeab0cc9\",\"lessThan\":\"60a1969fae6209644698fca91c185d153674f631\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"sound/core/seq/seq_ump_client.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.5\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.5\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.142\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.92\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0cb1ad795570167558530d6194297ac2396a1991\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3aab4a58d23fb22dac5b558bbe5df1a8dad00b4b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/60a1969fae6209644698fca91c185d153674f631\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8ba1c4ddbb1c67d34bb440aecb9f5690ed3f64cb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ef46b616a4c219185bbf10ebcbacb571583fd0e4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.