{"id":"CVE-2021-47305","state":"PUBLISHED","title":"dma-buf/sync_file: Don't leak fences on merge failure","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndma-buf/sync_file: Don't leak fences on merge failure\n\nEach add_fence() call does a dma_fence_get() on the relevant fence.  In\nthe error path, we weren't calling dma_fence_put() so all those fences\ngot leaked.  Also, in the krealloc_array failure case, we weren't\nfreeing the fences array.  Instead, ensure that i and fences are always\nzero-initialized and dma_fence_put() all the fences and kfree(fences) on\nevery error path.","publishedAt":"2024-05-21T14:35:25.345Z","updatedAt":"2026-05-11T13:51:55.194Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a02b9dc90d844cc7df7b63264e7920cc425052d9","status":"affected","lessThan":"19f51c2529339280d2c8c6427cd3e21ddf1ac3f8","versionType":"git"},{"version":"a02b9dc90d844cc7df7b63264e7920cc425052d9","status":"affected","lessThan":"e0355a0ad31a1d677b2a4514206de4902bd550e8","versionType":"git"},{"version":"a02b9dc90d844cc7df7b63264e7920cc425052d9","status":"affected","lessThan":"41f45e91c92c8480242ea448d54e28c753b13902","versionType":"git"},{"version":"a02b9dc90d844cc7df7b63264e7920cc425052d9","status":"affected","lessThan":"0d514185ae792d3a1903c8e1a83899aa996705ce","versionType":"git"},{"version":"a02b9dc90d844cc7df7b63264e7920cc425052d9","status":"affected","lessThan":"19edcd97727aae9362444a859a24d99a8730cb27","versionType":"git"},{"version":"a02b9dc90d844cc7df7b63264e7920cc425052d9","status":"affected","lessThan":"ffe000217c5068c5da07ccb1c0f8cce7ad767435","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma-buf/sync_file.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.9","versionType":"semver"},{"version":"4.14.241","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.199","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.135","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.53","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.13.5","status":"unaffected","lessThanOrEqual":"5.13.*","versionType":"semver"},{"version":"5.14","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma-buf/sync_file.c"]}],"references":["https://git.kernel.org/stable/c/19f51c2529339280d2c8c6427cd3e21ddf1ac3f8","https://git.kernel.org/stable/c/e0355a0ad31a1d677b2a4514206de4902bd550e8","https://git.kernel.org/stable/c/41f45e91c92c8480242ea448d54e28c753b13902","https://git.kernel.org/stable/c/0d514185ae792d3a1903c8e1a83899aa996705ce","https://git.kernel.org/stable/c/19edcd97727aae9362444a859a24d99a8730cb27","https://git.kernel.org/stable/c/ffe000217c5068c5da07ccb1c0f8cce7ad767435"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47305.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47305","state":"PUBLISHED","datePublished":"2024-05-21T14:35:25.345Z","dateUpdated":"2026-05-11T13:51:55.194Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-21T13:27:52.133Z"},"containers":{"cna":{"title":"dma-buf/sync_file: Don't leak fences on merge failure","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndma-buf/sync_file: Don't leak fences on merge failure\n\nEach add_fence() call does a dma_fence_get() on the relevant fence.  In\nthe error path, we weren't calling dma_fence_put() so all those fences\ngot leaked.  Also, in the krealloc_array failure case, we weren't\nfreeing the fences array.  Instead, ensure that i and fences are always\nzero-initialized and dma_fence_put() all the fences and kfree(fences) on\nevery error path."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a02b9dc90d844cc7df7b63264e7920cc425052d9","status":"affected","lessThan":"19f51c2529339280d2c8c6427cd3e21ddf1ac3f8","versionType":"git"},{"version":"a02b9dc90d844cc7df7b63264e7920cc425052d9","status":"affected","lessThan":"e0355a0ad31a1d677b2a4514206de4902bd550e8","versionType":"git"},{"version":"a02b9dc90d844cc7df7b63264e7920cc425052d9","status":"affected","lessThan":"41f45e91c92c8480242ea448d54e28c753b13902","versionType":"git"},{"version":"a02b9dc90d844cc7df7b63264e7920cc425052d9","status":"affected","lessThan":"0d514185ae792d3a1903c8e1a83899aa996705ce","versionType":"git"},{"version":"a02b9dc90d844cc7df7b63264e7920cc425052d9","status":"affected","lessThan":"19edcd97727aae9362444a859a24d99a8730cb27","versionType":"git"},{"version":"a02b9dc90d844cc7df7b63264e7920cc425052d9","status":"affected","lessThan":"ffe000217c5068c5da07ccb1c0f8cce7ad767435","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma-buf/sync_file.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.9","versionType":"semver"},{"version":"4.14.241","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.199","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.135","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.53","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.13.5","status":"unaffected","lessThanOrEqual":"5.13.*","versionType":"semver"},{"version":"5.14","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma-buf/sync_file.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/19f51c2529339280d2c8c6427cd3e21ddf1ac3f8"},{"url":"https://git.kernel.org/stable/c/e0355a0ad31a1d677b2a4514206de4902bd550e8"},{"url":"https://git.kernel.org/stable/c/41f45e91c92c8480242ea448d54e28c753b13902"},{"url":"https://git.kernel.org/stable/c/0d514185ae792d3a1903c8e1a83899aa996705ce"},{"url":"https://git.kernel.org/stable/c/19edcd97727aae9362444a859a24d99a8730cb27"},{"url":"https://git.kernel.org/stable/c/ffe000217c5068c5da07ccb1c0f8cce7ad767435"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T13:51:55.194Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"4.14.241"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"4.19.199"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"5.4.135"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"5.10.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"5.13.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9","versionEndExcluding":"5.14"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2024-06-17T17:37:39.251165Z","id":"CVE-2021-47305","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-06-17T17:39:09.946Z"}},{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/19f51c2529339280d2c8c6427cd3e21ddf1ac3f8","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/e0355a0ad31a1d677b2a4514206de4902bd550e8","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/41f45e91c92c8480242ea448d54e28c753b13902","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/0d514185ae792d3a1903c8e1a83899aa996705ce","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/19edcd97727aae9362444a859a24d99a8730cb27","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/ffe000217c5068c5da07ccb1c0f8cce7ad767435","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-04T05:32:08.577Z"}}]}}}