CVE-2026-74339ALSA: seq: Clear variable event pointer on read
- —Not scoredno CVSS score yet
- 0.22%Exploitation in 30 daysEPSS · top 87% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.22% · top 87% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 8a631e1aaa1ebbc9de916927fa01707244e18291
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 14fe4f75fd5309d6b75f8e840ada88912b374207
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < f29243c211928114f8b906e0a3fee77c236f14c8
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < e0c3edd86414534cfd179fefe45b38c29c01ae7a
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 6b52211eba213c461f68922708a99d8190c1fcd5
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 74ac1ce1f4afdb3b80b6742fa28fb86c8c51d31b
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < c2ac9287e89916da684c2a548798351e63eb59ee
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 705dd6dcbc0ea87351c660c1a6443f85f1001c76
- affected 2.6.12
- unaffected < 2.6.12
- unaffected 5.10.273 – ≤ 5.10.*
- unaffected 5.15.212 – ≤ 5.15.*
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.97 – ≤ 6.12.*
- unaffected 6.18.40 – ≤ 6.18.*
- unaffected 7.1.5 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/8a631e1aaa1ebbc9de916927fa01707244e18291 (opens in a new tab)
- https://git.kernel.org/stable/c/14fe4f75fd5309d6b75f8e840ada88912b374207 (opens in a new tab)
- https://git.kernel.org/stable/c/f29243c211928114f8b906e0a3fee77c236f14c8 (opens in a new tab)
- https://git.kernel.org/stable/c/e0c3edd86414534cfd179fefe45b38c29c01ae7a (opens in a new tab)
- https://git.kernel.org/stable/c/6b52211eba213c461f68922708a99d8190c1fcd5 (opens in a new tab)
- https://git.kernel.org/stable/c/74ac1ce1f4afdb3b80b6742fa28fb86c8c51d31b (opens in a new tab)
- https://git.kernel.org/stable/c/c2ac9287e89916da684c2a548798351e63eb59ee (opens in a new tab)
- https://git.kernel.org/stable/c/705dd6dcbc0ea87351c660c1a6443f85f1001c76 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-59486 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-74339)Record last updated .