Answer in brief
CVE-2026-74261 records a Unknown severity vulnerability in ALSA: seq: avoid stale FIFO cells during resize. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), 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), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=2d7d54002e396c180db0c800c1046f0a3c471597 <98a965cb1e767b54b6bbd831b6cea26f521a8f51 || >=2d7d54002e396c180db0c800c1046f0a3c471597 <1c4c35fb68d520241f7d9f1c356b5e2370fd8364 || >=2d7d54002e396c180db0c800c1046f0a3c471597 <e546128291f8d688dcb931827e2efd2aa6c0734d || df7a2d0af9f7ab73cf22a7b62bbc0bad93a02110 || 28e0ebdd57cd3287ac821068364b74c70af3861c || d4b8e8a32d74052fe292618ae19f794944ddc673 || e91325f27c4d98d1088e9e86b3ab475f752eeb80 || 9ebfed203c0d93449a074c5c2fd5bb3e58518f0d || 3492352e1f34673708fa7409b4b1d97545aa2f1c || a90d7447e4a154ad26e3b9e09a0878680be49339 || 74a2c1ff88a4e0960623d17f7db56ac5a60bb0cf || c36ef6467420f8982e6d4d6f93d0634a85a5ee45 || >=3.2.91 <3.3 || >=3.10.107 <3.11 || >=3.12.73 <3.13 || >=3.16.46 <3.17 || >=3.18.50 <3.19 || >=4.1.40 <4.2 || >=4.4.60 <4.5 || >=4.9.21 <4.10 || >=4.10.9 <4.11 | 98a965cb1e767b54b6bbd831b6cea26f521a8f51, 1c4c35fb68d520241f7d9f1c356b5e2370fd8364, e546128291f8d688dcb931827e2efd2aa6c0734d, 3.3, 3.11, 3.13, 3.17, 3.19, 4.2, 4.5, 4.10, 4.11 |
| Linux/Linuxgeneric | 4.11 | Not reported |
| Linux/Linuxgeneric | >=2d7d54002e396c180db0c800c1046f0a3c471597 <ae429220c7f9747579bc4682c574585230e971cc || >=2d7d54002e396c180db0c800c1046f0a3c471597 <dcf784abee6df2f5c47e36a1d9e400065993bc04 || >=2d7d54002e396c180db0c800c1046f0a3c471597 <98a965cb1e767b54b6bbd831b6cea26f521a8f51 || >=2d7d54002e396c180db0c800c1046f0a3c471597 <1c4c35fb68d520241f7d9f1c356b5e2370fd8364 || >=2d7d54002e396c180db0c800c1046f0a3c471597 <e546128291f8d688dcb931827e2efd2aa6c0734d || df7a2d0af9f7ab73cf22a7b62bbc0bad93a02110 || 28e0ebdd57cd3287ac821068364b74c70af3861c || d4b8e8a32d74052fe292618ae19f794944ddc673 || e91325f27c4d98d1088e9e86b3ab475f752eeb80 || 9ebfed203c0d93449a074c5c2fd5bb3e58518f0d || 3492352e1f34673708fa7409b4b1d97545aa2f1c || a90d7447e4a154ad26e3b9e09a0878680be49339 || 74a2c1ff88a4e0960623d17f7db56ac5a60bb0cf || c36ef6467420f8982e6d4d6f93d0634a85a5ee45 || >=3.2.91 <3.3 || >=3.10.107 <3.11 || >=3.12.73 <3.13 || >=3.16.46 <3.17 || >=3.18.50 <3.19 || >=4.1.40 <4.2 || >=4.4.60 <4.5 || >=4.9.21 <4.10 || >=4.10.9 <4.11 | ae429220c7f9747579bc4682c574585230e971cc, dcf784abee6df2f5c47e36a1d9e400065993bc04, 98a965cb1e767b54b6bbd831b6cea26f521a8f51, 1c4c35fb68d520241f7d9f1c356b5e2370fd8364, e546128291f8d688dcb931827e2efd2aa6c0734d, 3.3, 3.11, 3.13, 3.17, 3.19, 4.2, 4.5, 4.10, 4.11 |
| Linux/Linuxgeneric | >=2d7d54002e396c180db0c800c1046f0a3c471597 <8bb506ffb848e3de1496a4cf23a2fd694da2a7d2 || >=2d7d54002e396c180db0c800c1046f0a3c471597 <ae429220c7f9747579bc4682c574585230e971cc || >=2d7d54002e396c180db0c800c1046f0a3c471597 <dcf784abee6df2f5c47e36a1d9e400065993bc04 || >=2d7d54002e396c180db0c800c1046f0a3c471597 <98a965cb1e767b54b6bbd831b6cea26f521a8f51 || >=2d7d54002e396c180db0c800c1046f0a3c471597 <1c4c35fb68d520241f7d9f1c356b5e2370fd8364 || >=2d7d54002e396c180db0c800c1046f0a3c471597 <e546128291f8d688dcb931827e2efd2aa6c0734d || df7a2d0af9f7ab73cf22a7b62bbc0bad93a02110 || 28e0ebdd57cd3287ac821068364b74c70af3861c || d4b8e8a32d74052fe292618ae19f794944ddc673 || e91325f27c4d98d1088e9e86b3ab475f752eeb80 || 9ebfed203c0d93449a074c5c2fd5bb3e58518f0d || 3492352e1f34673708fa7409b4b1d97545aa2f1c || a90d7447e4a154ad26e3b9e09a0878680be49339 || 74a2c1ff88a4e0960623d17f7db56ac5a60bb0cf || c36ef6467420f8982e6d4d6f93d0634a85a5ee45 || >=3.2.91 <3.3 || >=3.10.107 <3.11 || >=3.12.73 <3.13 || >=3.16.46 <3.17 || >=3.18.50 <3.19 || >=4.1.40 <4.2 || >=4.4.60 <4.5 || >=4.9.21 <4.10 || >=4.10.9 <4.11 | 8bb506ffb848e3de1496a4cf23a2fd694da2a7d2, ae429220c7f9747579bc4682c574585230e971cc, dcf784abee6df2f5c47e36a1d9e400065993bc04, 98a965cb1e767b54b6bbd831b6cea26f521a8f51, 1c4c35fb68d520241f7d9f1c356b5e2370fd8364, e546128291f8d688dcb931827e2efd2aa6c0734d, 3.3, 3.11, 3.13, 3.17, 3.19, 4.2, 4.5, 4.10, 4.11 |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 30, 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: avoid stale FIFO cells during resize snd_seq_fifo_resize() still needs to publish the replacement pool before it waits for FIFO users. A blocking snd_seq_read() holds f->use_lock while it sleeps, so concurrent senders must be able to queue to the new pool and wake that reader instead of failing against a closing old pool. However, snd_seq_fifo_event_in() duplicates an event before it takes f->lock, and snd_seq_read() can dequeue a cell and later call snd_seq_fifo_cell_putback() if copy_to_user() or snd_seq_expand_var_event() fails. If resize swaps f->pool and detaches oldhead in between, either path can relink an old-pool cell after the snapshot. That stale cell sits outside the drained oldhead list, keeps oldpool->counter elevated, and can leave snd_seq_pool_delete() waiting for the retired pool to drain. Keep the existing swap-before-wait ordering in snd_seq_fifo_resize(), but reject stale cells before any FIFO relink. Revalidate event-in cells under f->lock and retry them against the published replacement pool, and free stale putback cells instead of linking them back into the FIFO. The buggy scenario involves two paths, with each column showing the order within that path: resize path: relink path: 1. Allocate newpool. 1. Take f->use_lock. 2. Swap f->pool to newpool and 2. Duplicate or dequeue an old-pool detach oldhead. cell before oldpool closes. 3. Mark oldpool closing and 3. Reach a later relink point after wait for FIFO users. resize published newpool. 4. Free oldhead and delete 4. Relink the old-pool cell after oldpool. resize detached oldhead. 5. Drop f->use_lock. The reproducer reports a resize ioctl blocked in the expected pool teardown path: signal: resize iteration=98 target_pool=4 exceeded 250ms (elapsed=251ms) diagnostic: resize_tid=651 wchan=snd_seq_pool_done diagnostic: resize_tid=651 stack= snd_seq_pool_done+0x5b/0x140 snd_seq_pool_delete+0x7a/0x90 snd_seq_fifo_resize+0x193/0x1e0 snd_seq_ioctl_set_client_pool+0x214/0x260 snd_seq_ioctl+0x119/0x540 __x64_sys_ioctl+0xd1/0x120 do_syscall_64+0xbb/0x2f0 entry_SYSCALL_64_after_hwframe+0x77/0x7f A second run with larger pools hit the same target path: signal: resize iteration=32 target_pool=64 exceeded 250ms (elapsed=251ms) diagnostic: resize_tid=663 wchan=snd_seq_pool_done diagnostic: resize_tid=663 stack= snd_seq_pool_done+0x5b/0x140 snd_seq_pool_delete+0x7a/0x90 snd_seq_fifo_resize+0x193/0x1e0 snd_seq_ioctl_set_client_pool+0x214/0x260 snd_seq_ioctl+0x119/0x540 __x64_sys_ioctl+0xd1/0x120 do_syscall_64+0xbb/0x2f0 entry_SYSCALL_64_after_hwframe+0x77/0x7f
Quoted source text, attributed separately from HOL analysis.