Answer in brief
CVE-2026-98521 records a Unknown severity vulnerability in drm/i915: fix incorrect RCU teardown order. 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 | >=912ff2ebd695c582ca4cebf833ad73a378a99f23 <4d4ca84213327da1f84ef7af3946dea6b14c5d88 || >=912ff2ebd695c582ca4cebf833ad73a378a99f23 <c53db9cc245219af6b528ca022a17ebfa91d80ba || >=912ff2ebd695c582ca4cebf833ad73a378a99f23 <b12e041aedcf9fa77c6002a49f07eb20d0521b86 || >=912ff2ebd695c582ca4cebf833ad73a378a99f23 <cc890d3f1b15bf6481dc7270fba0b4fbba572813 || >=912ff2ebd695c582ca4cebf833ad73a378a99f23 <2dd0190e397ec6468095fd3e80e79276a7361449 || >=912ff2ebd695c582ca4cebf833ad73a378a99f23 <d2da6696e0c4e60414706e607029d0bb0330c67e | 4d4ca84213327da1f84ef7af3946dea6b14c5d88, c53db9cc245219af6b528ca022a17ebfa91d80ba, b12e041aedcf9fa77c6002a49f07eb20d0521b86, cc890d3f1b15bf6481dc7270fba0b4fbba572813, 2dd0190e397ec6468095fd3e80e79276a7361449, d2da6696e0c4e60414706e607029d0bb0330c67e |
| Linux/Linuxgeneric | 5.17 | Not reported |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
In the Linux kernel, the following vulnerability has been resolved: drm/i915: fix incorrect RCU teardown order i915_gem_busy_ioctl uses dma_resv_for_each_fence_unlocked() to iterate over the fences in an GEM object without holding a reference but only the RCU read side lock. What can happen here is that the GEM object is destroyed concurrently while i915_gem_busy_ioctl is still running. This won't free the GEM objects memory, but still drops all the dma_fence references. Now when dma_resv_for_each_fence_unlocked() sees a destroyed dma_fence it assumes that a new fence list was installed and re-starts the loop. But in the case of a destroyed GEM object a new fence list is never installed, only the old one freed and therefore the iteration never finishes resulting in an endless loop. The solution is to drop the fence references only after the RCU grace period. The fixes tag is not necessary the patch introducing the problem, but the one making it so worse that we need to address it. This problem was pointed out by Sashiko-bot. (cherry picked from commit 5113479556025093bf8133bb2dcaa33be2d50921)
Quoted source text, attributed separately from HOL analysis.