CVE-2023-53501 (GCVE-0-2023-53501)

Vulnerability from cvelistv5 – Published: 2025-10-01 11:45 – Updated: 2026-05-11 19:46
VLAI?
Title
iommu/amd/iommu_v2: Fix pasid_state refcount dec hit 0 warning on pasid unbind
Summary
In the Linux kernel, the following vulnerability has been resolved: iommu/amd/iommu_v2: Fix pasid_state refcount dec hit 0 warning on pasid unbind When unbinding pasid - a race condition exists vs outstanding page faults. To prevent this, the pasid_state object contains a refcount. * set to 1 on pasid bind * incremented on each ppr notification start * decremented on each ppr notification done * decremented on pasid unbind Since refcount_dec assumes that refcount will never reach 0: the current implementation causes the following to be invoked on pasid unbind: REFCOUNT_WARN("decrement hit 0; leaking memory") Fix this issue by changing refcount_dec to refcount_dec_and_test to explicitly handle refcount=1.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8bc54824da4e8fcf0ed679cf09ac32f23d83254a , < a50d60b8f2aff46dd7c7edb4a5835cdc4d432c22 (git)
Affected: 8bc54824da4e8fcf0ed679cf09ac32f23d83254a , < 13ed255248dfbbb7f23f9170c7a537fb9ca22c73 (git)
Affected: 8bc54824da4e8fcf0ed679cf09ac32f23d83254a , < 9ccc51be3126b25cfe9351dbffde946c925cc28a (git)
Affected: 8bc54824da4e8fcf0ed679cf09ac32f23d83254a , < 98d86bf32187db27946ca817c2467a5f2f7aa02f (git)
Affected: 8bc54824da4e8fcf0ed679cf09ac32f23d83254a , < 534103bcd52ca9c1fecbc70e717b4a538dc4ded8 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.132 , ≤ 5.15.* (semver)
Unaffected: 6.1.53 , ≤ 6.1.* (semver)
Unaffected: 6.4.16 , ≤ 6.4.* (semver)
Unaffected: 6.5.3 , ≤ 6.5.* (semver)
Unaffected: 6.6 , ≤ * (original_commit_for_fix)
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.