Answer in brief
CVE-2026-74339 records a Unknown severity vulnerability in ALSA: seq: Clear variable event pointer on read. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-74339 records a Unknown severity vulnerability in ALSA: seq: Clear variable event pointer on read. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <14fe4f75fd5309d6b75f8e840ada88912b374207 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f29243c211928114f8b906e0a3fee77c236f14c8 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e0c3edd86414534cfd179fefe45b38c29c01ae7a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6b52211eba213c461f68922708a99d8190c1fcd5 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <74ac1ce1f4afdb3b80b6742fa28fb86c8c51d31b || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c2ac9287e89916da684c2a548798351e63eb59ee || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <705dd6dcbc0ea87351c660c1a6443f85f1001c76 | 14fe4f75fd5309d6b75f8e840ada88912b374207, f29243c211928114f8b906e0a3fee77c236f14c8, e0c3edd86414534cfd179fefe45b38c29c01ae7a, 6b52211eba213c461f68922708a99d8190c1fcd5, 74ac1ce1f4afdb3b80b6742fa28fb86c8c51d31b, c2ac9287e89916da684c2a548798351e63eb59ee, 705dd6dcbc0ea87351c660c1a6443f85f1001c76 |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <14fe4f75fd5309d6b75f8e840ada88912b374207 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f29243c211928114f8b906e0a3fee77c236f14c8 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e0c3edd86414534cfd179fefe45b38c29c01ae7a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6b52211eba213c461f68922708a99d8190c1fcd5 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <74ac1ce1f4afdb3b80b6742fa28fb86c8c51d31b || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c2ac9287e89916da684c2a548798351e63eb59ee || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <705dd6dcbc0ea87351c660c1a6443f85f1001c76 | 14fe4f75fd5309d6b75f8e840ada88912b374207, f29243c211928114f8b906e0a3fee77c236f14c8, e0c3edd86414534cfd179fefe45b38c29c01ae7a, 6b52211eba213c461f68922708a99d8190c1fcd5, 74ac1ce1f4afdb3b80b6742fa28fb86c8c51d31b, c2ac9287e89916da684c2a548798351e63eb59ee, 705dd6dcbc0ea87351c660c1a6443f85f1001c76 |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.