CVE-2026-74339None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: ALSA: seq: Clear variable event pointer on read snd_seq_read() copies a queued variable-length event header to userspace before expanding the payload. Queued variable-…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
Last analysed / modified upstream
In the Linux kernel, the following vulnerability has been resolved:
ALSA: seq: Clear variable event pointer on read
snd_seq_read() copies a queued variable-length event header to userspace before expanding the payload. Queued variable-length events use SNDRV_SEQ_EXT_CHAINED internally, and data.ext.ptr points at the first extension cell.
The read side strips SNDRV_SEQ_EXT_* bits from data.ext.len before the copy, but it leaves data.ext.ptr untouched. A userspace sequencer client can therefore write a direct variable event to itself and read back the extension-cell kernel address from the returned header.
Clear the temporary header pointer before copy_to_user(). The original queued event remains unchanged and is still passed to snd_seq_expand_var_event(), so payload expansion keeps using the internal chain.
Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8a631e1aaa1ebbc9de916927fa01707244e18291Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 14fe4f75fd5309d6b75f8e840ada88912b374207Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f29243c211928114f8b906e0a3fee77c236f14c8Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e0c3edd86414534cfd179fefe45b38c29c01ae7aLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6b52211eba213c461f68922708a99d8190c1fcd5Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 74ac1ce1f4afdb3b80b6742fa28fb86c8c51d31bLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c2ac9287e89916da684c2a548798351e63eb59eeLinux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 705dd6dcbc0ea87351c660c1a6443f85f1001c76Linux 2.6.12Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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