{"id":"CVE-2023-53501","state":"PUBLISHED","title":"iommu/amd/iommu_v2: Fix pasid_state refcount dec hit 0 warning on pasid unbind","description":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd/iommu_v2: Fix pasid_state refcount dec hit 0 warning on pasid unbind\n\nWhen unbinding pasid - a race condition exists vs outstanding page faults.\n\nTo prevent this, the pasid_state object contains a refcount.\n    * set to 1 on pasid bind\n    * incremented on each ppr notification start\n    * decremented on each ppr notification done\n    * decremented on pasid unbind\n\nSince refcount_dec assumes that refcount will never reach 0:\n  the current implementation causes the following to be invoked on\n  pasid unbind:\n        REFCOUNT_WARN(\"decrement hit 0; leaking memory\")\n\nFix this issue by changing refcount_dec to refcount_dec_and_test\nto explicitly handle refcount=1.","publishedAt":"2025-10-01T11:45:52.204Z","updatedAt":"2026-05-11T19:46:13.112Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8bc54824da4e8fcf0ed679cf09ac32f23d83254a","status":"affected","lessThan":"a50d60b8f2aff46dd7c7edb4a5835cdc4d432c22","versionType":"git"},{"version":"8bc54824da4e8fcf0ed679cf09ac32f23d83254a","status":"affected","lessThan":"13ed255248dfbbb7f23f9170c7a537fb9ca22c73","versionType":"git"},{"version":"8bc54824da4e8fcf0ed679cf09ac32f23d83254a","status":"affected","lessThan":"9ccc51be3126b25cfe9351dbffde946c925cc28a","versionType":"git"},{"version":"8bc54824da4e8fcf0ed679cf09ac32f23d83254a","status":"affected","lessThan":"98d86bf32187db27946ca817c2467a5f2f7aa02f","versionType":"git"},{"version":"8bc54824da4e8fcf0ed679cf09ac32f23d83254a","status":"affected","lessThan":"534103bcd52ca9c1fecbc70e717b4a538dc4ded8","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/amd/iommu_v2.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"5.15.132","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.53","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.4.16","status":"unaffected","lessThanOrEqual":"6.4.*","versionType":"semver"},{"version":"6.5.3","status":"unaffected","lessThanOrEqual":"6.5.*","versionType":"semver"},{"version":"6.6","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/amd/iommu_v2.c"]}],"references":["https://git.kernel.org/stable/c/a50d60b8f2aff46dd7c7edb4a5835cdc4d432c22","https://git.kernel.org/stable/c/13ed255248dfbbb7f23f9170c7a537fb9ca22c73","https://git.kernel.org/stable/c/9ccc51be3126b25cfe9351dbffde946c925cc28a","https://git.kernel.org/stable/c/98d86bf32187db27946ca817c2467a5f2f7aa02f","https://git.kernel.org/stable/c/534103bcd52ca9c1fecbc70e717b4a538dc4ded8"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/53xxx/CVE-2023-53501.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-53501","state":"PUBLISHED","datePublished":"2025-10-01T11:45:52.204Z","dateUpdated":"2026-05-11T19:46:13.112Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-10-01T11:39:39.404Z"},"containers":{"cna":{"title":"iommu/amd/iommu_v2: Fix pasid_state refcount dec hit 0 warning on pasid unbind","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd/iommu_v2: Fix pasid_state refcount dec hit 0 warning on pasid unbind\n\nWhen unbinding pasid - a race condition exists vs outstanding page faults.\n\nTo prevent this, the pasid_state object contains a refcount.\n    * set to 1 on pasid bind\n    * incremented on each ppr notification start\n    * decremented on each ppr notification done\n    * decremented on pasid unbind\n\nSince refcount_dec assumes that refcount will never reach 0:\n  the current implementation causes the following to be invoked on\n  pasid unbind:\n        REFCOUNT_WARN(\"decrement hit 0; leaking memory\")\n\nFix this issue by changing refcount_dec to refcount_dec_and_test\nto explicitly handle refcount=1."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8bc54824da4e8fcf0ed679cf09ac32f23d83254a","status":"affected","lessThan":"a50d60b8f2aff46dd7c7edb4a5835cdc4d432c22","versionType":"git"},{"version":"8bc54824da4e8fcf0ed679cf09ac32f23d83254a","status":"affected","lessThan":"13ed255248dfbbb7f23f9170c7a537fb9ca22c73","versionType":"git"},{"version":"8bc54824da4e8fcf0ed679cf09ac32f23d83254a","status":"affected","lessThan":"9ccc51be3126b25cfe9351dbffde946c925cc28a","versionType":"git"},{"version":"8bc54824da4e8fcf0ed679cf09ac32f23d83254a","status":"affected","lessThan":"98d86bf32187db27946ca817c2467a5f2f7aa02f","versionType":"git"},{"version":"8bc54824da4e8fcf0ed679cf09ac32f23d83254a","status":"affected","lessThan":"534103bcd52ca9c1fecbc70e717b4a538dc4ded8","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/amd/iommu_v2.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"5.15.132","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.53","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.4.16","status":"unaffected","lessThanOrEqual":"6.4.*","versionType":"semver"},{"version":"6.5.3","status":"unaffected","lessThanOrEqual":"6.5.*","versionType":"semver"},{"version":"6.6","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/iommu/amd/iommu_v2.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/a50d60b8f2aff46dd7c7edb4a5835cdc4d432c22"},{"url":"https://git.kernel.org/stable/c/13ed255248dfbbb7f23f9170c7a537fb9ca22c73"},{"url":"https://git.kernel.org/stable/c/9ccc51be3126b25cfe9351dbffde946c925cc28a"},{"url":"https://git.kernel.org/stable/c/98d86bf32187db27946ca817c2467a5f2f7aa02f"},{"url":"https://git.kernel.org/stable/c/534103bcd52ca9c1fecbc70e717b4a538dc4ded8"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:46:13.112Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"5.15.132"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.1.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.4.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.5.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.6"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}