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CVE-2026-74339

UnknownEPSS 0.17%

Last modified

CVE-2026-74339 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability
0.17%

7.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 14fe4f75fd5309d6b75f8e840ada88912b374207; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f29243c211928114f8b906e0a3fee77c236f14c8; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e0c3edd86414534cfd179fefe45b38c29c01ae7a; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 6b52211eba213c461f68922708a99d8190c1fcd5; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 74ac1ce1f4afdb3b80b6742fa28fb86c8c51d31b; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < c2ac9287e89916da684c2a548798351e63eb59ee; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 705dd6dcbc0ea87351c660c1a6443f85f1001c76
LinuxLinux2.6.12

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-74339?
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.
How severe is CVE-2026-74339?
Severity scoring for CVE-2026-74339 is pending analysis. The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-74339?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST