drm/i915: fix incorrect RCU teardown order
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)
CVE-2026-98521
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-98521
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "912ff2ebd695c582ca4cebf833ad73a378a99f23",
"lessThan": "4d4ca84213327da1f84ef7af3946dea6b14c5d88",
"versionType": "git"
},
{
"status": "affected",
"version": "912ff2ebd695c582ca4cebf833ad73a378a99f23",
"lessThan": "c53db9cc245219af6b528ca022a17ebfa91d80ba",
"versionType": "git"
},
{
"status": "affected",
"version": "912ff2ebd695c582ca4cebf833ad73a378a99f23",
"lessThan": "b12e041aedcf9fa77c6002a49f07eb20d0521b86",
"versionType": "git"
},
{
"status": "affected",
"version": "912ff2ebd695c582ca4cebf833ad73a378a99f23",
"lessThan": "cc890d3f1b15bf6481dc7270fba0b4fbba572813",
"versionType": "git"
},
{
"status": "affected",
"version": "912ff2ebd695c582ca4cebf833ad73a378a99f23",
"lessThan": "2dd0190e397ec6468095fd3e80e79276a7361449",
"versionType": "git"
},
{
"status": "affected",
"version": "912ff2ebd695c582ca4cebf833ad73a378a99f23",
"lessThan": "d2da6696e0c4e60414706e607029d0bb0330c67e",
"versionType": "git"
}
],
"programFiles": [
"drivers/gpu/drm/i915/gem/i915_gem_object.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.17"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.17",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.55",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/gpu/drm/i915/gem/i915_gem_object.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98521
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38549 · Revision 1
- Added to Heist Feed
- Publisher date