{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-74388 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-74388 is a high-severity use after free vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-74388 and fix it if it is affected.\n\nWhat it is: CVE-2026-74388 is a high-severity use after free vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-74388 in the wild and no public exploit code.\n\nAffected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-74388/ (Markdown: https://insights.sbomify.com/CVE-2026-74388/index.md)","id":"CVE-2026-74388","markdown":"https://insights.sbomify.com/CVE-2026-74388/index.md","name":"CVE-2026-74388","record":{"aliases":["BELL-CVE-2026-74388","DEBIAN-CVE-2026-74388","GHSA-qr2g-fp68-m7q5","UBUNTU-CVE-2026-74388"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["code_execution","privilege_escalation"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel ALSA","requires_auth":"low_privilege","summary":"A use-after-free in the Linux kernel ALSA OSS sequencer allows local attackers to execute arbitrary code or escalate privileges via concurrent port closure.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":7.8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: seq: oss: Fix UAF at handling events with embedded SysEx data\n\nThe OSS sequencer processes the input MIDI bytes into a sequencer\nevent to be dispatched later (in snd_seq_oss_midi_putc() called from\nsnd_seq_oss_process_event()).  When it's a SysEx data, the event\nrecord contains data.ext.ptr pointer to the original SysEx bytes, and\nthe referred data is copied into the pool afterwards at dispatching.\nThe problem is that, if the sequencer port gets closed concurrently\nbefore the dispatch, the OSS sequencer core also releases the\nresources (in snd_seq_oss_midi_check_exit_port()), while the pending\nevent may hold a stale pointer, eventually leading to a UAF at a later\ndispatch.\n\nFortunately, there is already a refcounting mechanism (snd_use_lock_t)\nfor the OSS MIDI device access, and for addressing the issue above, we\njust need to extend the refcount until the event gets dispatched.\n\nThis patch extends snd_seq_oss_process_event() to give back the\nrefcount object, which is in turn released after calling the sequencer\ndispatcher with the given event in the caller side.\n\nAccording to the original report, KASAN report as below:\n\nKASAN slab-use-after-free in snd_seq_event_dup+0x40c/0x470\nRIP: 0033:0x7f2cb66a6340\nRead of size 6\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_seq_event_dup+0x40c/0x470 (?:?)\n  kasan_check_range+0x10c/0x1c0 (?:?)\n  __asan_memcpy+0x27/0x70 (?:?)\n  snd_seq_event_dup+0x9/0x470 (?:?)\n  snd_seq_client_enqueue_event+0x139/0x240 (?:?)\n  _raw_spin_unlock_irqrestore+0x4b/0x60 (?:?)\n  snd_seq_kernel_client_enqueue+0x102/0x120 (?:?)\n  snd_seq_oss_write+0x416/0x4e0 (?:?)\n  apparmor_file_permission+0x20/0x30 (?:?)\n  odev_write+0x3b/0x60 (?:?)\n  vfs_write+0x1ce/0x850 (?:?)\n  lock_release+0xc8/0x2a0 (?:?)\n  __kasan_check_write+0x18/0x20 (?:?)\n  __mutex_unlock_slowpath+0x129/0x510 (?:?)\n  ksys_write+0xe1/0x180 (?:?)\n  mutex_unlock+0x16/0x20 (?:?)\n  odev_ioctl+0x65/0xc0 (?:?)\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 (?:?)","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"ALSA: seq: oss: Fix UAF at handling events with embedded SysEx data","id":"CVE-2026-74388","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"use_after_free","year":"2026"},"n_packages":0,"n_references":5,"next":{"headline":"RDMA/hns: Fix log flood after cmd_mbox failure","id":"CVE-2026-74389"},"packages":[],"prev":{"headline":"ALSA: seq: midi: Serialize output teardown with event_input","id":"CVE-2026-74387"},"products":["Linux"],"published":"2026-08-15","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-21","vendors":["Linux"]},"summary":"A use-after-free in the Linux kernel ALSA OSS sequencer allows local attackers to execute arbitrary code or escalate privileges via concurrent port closure.","url":"https://insights.sbomify.com/CVE-2026-74388/"}