Answer in brief
CVE-2026-23371 records a Unknown severity vulnerability in sched/deadline: Fix missing ENQUEUE_REPLENISH during PI de-boosting. 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 | >=2279f540ea7d05f22d2f0c4224319330228586bc <ce6253fe718811cceb3a0ae0dbf0a5941dea3eb6 || >=2279f540ea7d05f22d2f0c4224319330228586bc <65af3633caf195d397ec4c39f51ae7615bd5a627 || >=2279f540ea7d05f22d2f0c4224319330228586bc <0638bf16b7a73a2fe63624bd0d16d9fd904805c3 || >=2279f540ea7d05f22d2f0c4224319330228586bc <ba1c22924ddcc280672a2a06a9ca99ee3a1b92c3 || >=2279f540ea7d05f22d2f0c4224319330228586bc <d658686a1331db3bb108ca079d76deb3208ed949 || 3cc3d77dc541181f97f1dc96d2977ef8359fd760 || d2b65976bf1ae9d0d9dd5770cd01695559438309 || >=4.19.257 <4.20 || >=5.4.212 <5.5 | ce6253fe718811cceb3a0ae0dbf0a5941dea3eb6, 65af3633caf195d397ec4c39f51ae7615bd5a627, 0638bf16b7a73a2fe63624bd0d16d9fd904805c3, ba1c22924ddcc280672a2a06a9ca99ee3a1b92c3, d658686a1331db3bb108ca079d76deb3208ed949, 4.20, 5.5 |
| Linux/Linuxgeneric | 5.10 | Not reported |
Published upstream
Mar 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 21, 2026
In the Linux kernel, the following vulnerability has been resolved: sched/deadline: Fix missing ENQUEUE_REPLENISH during PI de-boosting Running stress-ng --schedpolicy 0 on an RT kernel on a big machine might lead to the following WARNINGs (edited). sched: DL de-boosted task PID 22725: REPLENISH flag missing WARNING: CPU: 93 PID: 0 at kernel/sched/deadline.c:239 dequeue_task_dl+0x15c/0x1f8 ... (running_bw underflow) Call trace: dequeue_task_dl+0x15c/0x1f8 (P) dequeue_task+0x80/0x168 deactivate_task+0x24/0x50 push_dl_task+0x264/0x2e0 dl_task_timer+0x1b0/0x228 __hrtimer_run_queues+0x188/0x378 hrtimer_interrupt+0xfc/0x260 ... The problem is that when a SCHED_DEADLINE task (lock holder) is changed to a lower priority class via sched_setscheduler(), it may fail to properly inherit the parameters of potential DEADLINE donors if it didn't already inherit them in the past (shorter deadline than donor's at that time). This might lead to bandwidth accounting corruption, as enqueue_task_dl() won't recognize the lock holder as boosted. The scenario occurs when: 1. A DEADLINE task (donor) blocks on a PI mutex held by another DEADLINE task (holder), but the holder doesn't inherit parameters (e.g., it already has a shorter deadline) 2. sched_setscheduler() changes the holder from DEADLINE to a lower class while still holding the mutex 3. The holder should now inherit DEADLINE parameters from the donor and be enqueued with ENQUEUE_REPLENISH, but this doesn't happen Fix the issue by introducing __setscheduler_dl_pi(), which detects when a DEADLINE (proper or boosted) task gets setscheduled to a lower priority class. In case, the function makes the task inherit DEADLINE parameters of the donoer (pi_se) and sets ENQUEUE_REPLENISH flag to ensure proper bandwidth accounting during the next enqueue operation.
Quoted source text, attributed separately from HOL analysis.