CVE-2026-64029 (GCVE-0-2026-64029)
Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-08-05 12:38
VLAI
EPSS
VEX
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)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
81fd444aa371261cd33f31d4ffd80faeeeab0cc9 , < 8ba1c4ddbb1c67d34bb440aecb9f5690ed3f64cb
(git)
Affected: 81fd444aa371261cd33f31d4ffd80faeeeab0cc9 , < 0cb1ad795570167558530d6194297ac2396a1991 (git) Affected: 81fd444aa371261cd33f31d4ffd80faeeeab0cc9 , < 3aab4a58d23fb22dac5b558bbe5df1a8dad00b4b (git) Affected: 81fd444aa371261cd33f31d4ffd80faeeeab0cc9 , < ef46b616a4c219185bbf10ebcbacb571583fd0e4 (git) Affected: 81fd444aa371261cd33f31d4ffd80faeeeab0cc9 , < 60a1969fae6209644698fca91c185d153674f631 (git) |
guessed | |
| 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) |
guessed |
{
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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"
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{
"lang": "en",
"value": "AV:L - Exploitation requires local access via the ALSA sequencer device node (/dev/snd/seq) using write(2) and port-subscription ioctls; there is no network, Bluetooth, or physical-device attack surface on the vulnerable code path.\nAC:L - The race is between concurrent UMP event delivery and the last output-port unsubscribe/close path, and a local attacker can control both sides with parallel threads (flood write() while repeatedly subscribing/unsubscribing to the UMP port).\nPR:L - Any local unprivileged user who can open /dev/snd/seq (typically membership in the audio group on desktop/workstation systems where UMP MIDI hardware is present) can create sequencer clients, subscribe to UMP kernel ports, and trigger the bug without real root or init-namespace capabilities.\nUI:N - Exploitation is fully attacker-driven through sequencer writes and subscription management; no victim interaction such as opening files, mounting filesystems, or plugging in devices is required beyond the UMP endpoint already being present on the system.\nS:U - Impact is confined to kernel memory corruption and potential local privilege escalation within the same kernel security boundary; this is not a VM escape, sandbox escape, or cross-authority boundary bypass.\nC:H - KASAN confirmed a slab use-after-free on freed substream runtime metadata in snd_rawmidi_kernel_write1(); UAF on kernel heap objects enables controlled reallocation and arbitrary kernel memory disclosure primitives.\nI:H - The UAF occurs inside snd_rawmidi_kernel_write1(), which performs memcpy() into runtime-\u003ebuffer using attacker-supplied UMP event payload, providing a plausible path to arbitrary kernel memory corruption and code execution beyond a simple crash.\nA:H - The confirmed KASAN slab-use-after-free in kernel write path causes kernel oops/panic; even without full exploitation, the bug reliably threatens system availability through kernel crash."
}
]
}
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"title": "ALSA: seq: Serialize UMP output teardown with event_input",
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"cveId": "CVE-2026-64029",
"datePublished": "2026-07-19T15:39:20.368Z",
"dateReserved": "2026-07-19T07:54:57.028Z",
"dateUpdated": "2026-08-05T12:38:23.130Z",
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{
"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 (?:?)"
}
],
"id": "CVE-2026-64029",
"lastModified": "2026-07-30T14:59:47.950",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-07-19T16:17:42.997",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"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"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Awaiting Analysis"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-09-17T15:01:33+00:00",
"cve": "CVE-2026-64029",
"id": "CVE-2026-64029",
"initial_release_date": "2026-07-19T00:00:00+00:00",
"product_status:fixed": "612",
"product_status:known_affected": "22",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ALSA: seq: Serialize UMP output teardown with event_input",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64029.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-19T01:51:54Z",
"cve": "CVE-2026-64029",
"id": "CVE-2026-64029",
"initial_release_date": "2026-07-21T13:01:12Z",
"product_status:first_fixed": "31",
"product_status:known_affected": "424",
"product_status:known_not_affected": "309",
"product_status:recommended": "190",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-64029",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64029.json",
"version": "11"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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