{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-57893","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-01-11T14:45:42.028Z","datePublished":"2025-01-15T13:05:45.550Z","dateUpdated":"2026-08-05T11:46:47.660Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:46:47.660Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: seq: oss: Fix races at processing SysEx messages\n\nOSS sequencer handles the SysEx messages split in 6 bytes packets, and\nALSA sequencer OSS layer tries to combine those.  It stores the data\nin the internal buffer and this access is racy as of now, which may\nlead to the out-of-bounds access.\n\nAs a temporary band-aid fix, introduce a mutex for serializing the\nprocess of the SysEx message packets."}],"metrics":[{"cvssV3_1":{"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"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable code is reached only through write() on the OSS sequencer character device /dev/sequencer or /dev/music, which requires local access to the machine. There is no remote or network path into snd_seq_oss_synth_sysex().\nAC:L - The attacker owns both sides of the race — two threads (or a concurrent SNDCTL_SEQ_RESET ioctl) hammering write() on the same file descriptor — and can retry the tight loop indefinitely until the unserialized dest/len window is hit. No condition outside the attacker's control is required.\nPR:L - Neither odev_open() nor the write path performs any capability check; only the device file permissions apply, and desktop udev/logind grant the logged-in unprivileged user access to /dev/sequencer and /dev/snd/seq (audio group / uaccess ACL). The attacker can even self-provision the required MIDI device by creating a MIDI_GENERIC sequencer port as an unprivileged user.\nUI:N - The attacker triggers the race entirely from its own threads via open/write/ioctl; no victim action, no file to be opened by another user, and no administrator step is involved.\nS:U - The corruption stays inside the kernel's own heap and security authority — a standard local kernel memory-safety bug with no VM, IOMMU, or sandbox boundary crossed.\nC:H - The race yields slab out-of-bounds access on a kmalloc'd object and, via the concurrent kfree() of info->sysex in the reset path, use-after-free access to freed heap memory; such heap corruption/UAF primitives are leverageable for kernel memory disclosure, and the SysEx event is dispatched with a racily-read length/pointer to a buffer the attacker can read back through the sequencer.\nI:H - This is an out-of-bounds heap *write* of fully attacker-chosen bytes past the 136-byte seq_oss_synth_sysex object (extendable further via chained lost-update races on the unlocked len++), plus a potential UAF write, which is the classic basis for heap grooming and control-flow hijack leading to privilege escalation.\nA:H - The out-of-bounds/use-after-free write reliably produces slab corruption and KASAN/SLUB-redzone-detected faults, and an unprivileged local user can repeat it in a loop to panic or destabilize the kernel."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/core/seq/oss/seq_oss_synth.c"],"versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"cff1de87ed14fc0f2332213d2367100e7ad0753a","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"d2392b79d8af3714ea8878b71c66dc49d3110f44","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"9d382112b36382aa65aad765f189ebde9926c101","status":"affected","versionType":"git"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"0179488ca992d79908b8e26b9213f1554fc5bacc","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/core/seq/oss/seq_oss_synth.c"],"versions":[{"version":"2.6.12","status":"affected"},{"version":"0","lessThan":"2.6.12","status":"unaffected","versionType":"semver"},{"version":"6.1.124","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.70","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.9","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.13","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.1.124"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.6.70"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.12.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.12","versionEndExcluding":"6.13"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/cff1de87ed14fc0f2332213d2367100e7ad0753a"},{"url":"https://git.kernel.org/stable/c/d2392b79d8af3714ea8878b71c66dc49d3110f44"},{"url":"https://git.kernel.org/stable/c/9d382112b36382aa65aad765f189ebde9926c101"},{"url":"https://git.kernel.org/stable/c/0179488ca992d79908b8e26b9213f1554fc5bacc"}],"title":"ALSA: seq: oss: Fix races at processing SysEx messages","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2025-11-03T20:55:07.270Z"}}]}}