{"id":"CVE-2023-54020","state":"PUBLISHED","title":"dmaengine: sf-pdma: pdma_desc memory leak fix","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: sf-pdma: pdma_desc memory leak fix\n\nCommit b2cc5c465c2c (\"dmaengine: sf-pdma: Add multithread support for a\nDMA channel\") changed sf_pdma_prep_dma_memcpy() to unconditionally\nallocate a new sf_pdma_desc each time it is called.\n\nThe driver previously recycled descs, by checking the in_use flag, only\nallocating additional descs if the existing one was in use. This logic\nwas removed in commit b2cc5c465c2c (\"dmaengine: sf-pdma: Add multithread\nsupport for a DMA channel\"), but sf_pdma_free_desc() was not changed to\nhandle the new behaviour.\n\nAs a result, each time sf_pdma_prep_dma_memcpy() is called, the previous\ndescriptor is leaked, over time leading to memory starvation:\n\n  unreferenced object 0xffffffe008447300 (size 192):\n  comm \"irq/39-mchp_dsc\", pid 343, jiffies 4294906910 (age 981.200s)\n  hex dump (first 32 bytes):\n    00 00 00 ff 00 00 00 00 b8 c1 00 00 00 00 00 00  ................\n    00 00 70 08 10 00 00 00 00 00 00 c0 00 00 00 00  ..p.............\n  backtrace:\n    [<00000000064a04f4>] kmemleak_alloc+0x1e/0x28\n    [<00000000018927a7>] kmem_cache_alloc+0x11e/0x178\n    [<000000002aea8d16>] sf_pdma_prep_dma_memcpy+0x40/0x112\n\nAdd the missing kfree() to sf_pdma_free_desc(), and remove the redundant\nin_use flag.","publishedAt":"2025-12-24T10:55:50.583Z","updatedAt":"2026-05-23T15:31:58.250Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5ab2782c944e324008ef5d658f2494a9f0e3c5ac","status":"affected","lessThan":"ad222c9af25e3f074c180e389b3477dce42afc4f","versionType":"git"},{"version":"b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc","status":"affected","lessThan":"03fece43fa109beba7cc9948c02f5e2d1205d607","versionType":"git"},{"version":"b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc","status":"affected","lessThan":"8bd5040bd43f2b5ba3c898b09a3197a0c7ace126","versionType":"git"},{"version":"b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc","status":"affected","lessThan":"b02e07015a5ac7bbc029da931ae17914b8ae0339","versionType":"git"},{"version":"b9b4992f897be9b0b9e3a3b956cab6b75ccc3f11","status":"affected","versionType":"git"},{"version":"4c7350b1dd8a192af844de32fc99b9e34c876fda","status":"affected","versionType":"git"},{"version":"a93b3f1e11971a91b6441b6d47488f4492cc113f","status":"affected","versionType":"git"},{"version":"5.15.61","status":"affected","lessThan":"5.15.99","versionType":"semver"},{"version":"5.10.137","status":"affected","lessThan":"5.11","versionType":"semver"},{"version":"5.18.18","status":"affected","lessThan":"5.19","versionType":"semver"},{"version":"5.19.2","status":"affected","lessThan":"5.20","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/sf-pdma/sf-pdma.c","drivers/dma/sf-pdma/sf-pdma.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"5.15.99","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.16","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2.3","status":"unaffected","lessThanOrEqual":"6.2.*","versionType":"semver"},{"version":"6.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/sf-pdma/sf-pdma.c","drivers/dma/sf-pdma/sf-pdma.h"]}],"references":["https://git.kernel.org/stable/c/ad222c9af25e3f074c180e389b3477dce42afc4f","https://git.kernel.org/stable/c/03fece43fa109beba7cc9948c02f5e2d1205d607","https://git.kernel.org/stable/c/8bd5040bd43f2b5ba3c898b09a3197a0c7ace126","https://git.kernel.org/stable/c/b02e07015a5ac7bbc029da931ae17914b8ae0339"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:42.242Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/54xxx/CVE-2023-54020.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-54020","state":"PUBLISHED","datePublished":"2025-12-24T10:55:50.583Z","dateUpdated":"2026-05-23T15:31:58.250Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-24T10:53:46.179Z"},"containers":{"cna":{"title":"dmaengine: sf-pdma: pdma_desc memory leak fix","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: sf-pdma: pdma_desc memory leak fix\n\nCommit b2cc5c465c2c (\"dmaengine: sf-pdma: Add multithread support for a\nDMA channel\") changed sf_pdma_prep_dma_memcpy() to unconditionally\nallocate a new sf_pdma_desc each time it is called.\n\nThe driver previously recycled descs, by checking the in_use flag, only\nallocating additional descs if the existing one was in use. This logic\nwas removed in commit b2cc5c465c2c (\"dmaengine: sf-pdma: Add multithread\nsupport for a DMA channel\"), but sf_pdma_free_desc() was not changed to\nhandle the new behaviour.\n\nAs a result, each time sf_pdma_prep_dma_memcpy() is called, the previous\ndescriptor is leaked, over time leading to memory starvation:\n\n  unreferenced object 0xffffffe008447300 (size 192):\n  comm \"irq/39-mchp_dsc\", pid 343, jiffies 4294906910 (age 981.200s)\n  hex dump (first 32 bytes):\n    00 00 00 ff 00 00 00 00 b8 c1 00 00 00 00 00 00  ................\n    00 00 70 08 10 00 00 00 00 00 00 c0 00 00 00 00  ..p.............\n  backtrace:\n    [<00000000064a04f4>] kmemleak_alloc+0x1e/0x28\n    [<00000000018927a7>] kmem_cache_alloc+0x11e/0x178\n    [<000000002aea8d16>] sf_pdma_prep_dma_memcpy+0x40/0x112\n\nAdd the missing kfree() to sf_pdma_free_desc(), and remove the redundant\nin_use flag."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"5ab2782c944e324008ef5d658f2494a9f0e3c5ac","status":"affected","lessThan":"ad222c9af25e3f074c180e389b3477dce42afc4f","versionType":"git"},{"version":"b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc","status":"affected","lessThan":"03fece43fa109beba7cc9948c02f5e2d1205d607","versionType":"git"},{"version":"b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc","status":"affected","lessThan":"8bd5040bd43f2b5ba3c898b09a3197a0c7ace126","versionType":"git"},{"version":"b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc","status":"affected","lessThan":"b02e07015a5ac7bbc029da931ae17914b8ae0339","versionType":"git"},{"version":"b9b4992f897be9b0b9e3a3b956cab6b75ccc3f11","status":"affected","versionType":"git"},{"version":"4c7350b1dd8a192af844de32fc99b9e34c876fda","status":"affected","versionType":"git"},{"version":"a93b3f1e11971a91b6441b6d47488f4492cc113f","status":"affected","versionType":"git"},{"version":"5.15.61","status":"affected","lessThan":"5.15.99","versionType":"semver"},{"version":"5.10.137","status":"affected","lessThan":"5.11","versionType":"semver"},{"version":"5.18.18","status":"affected","lessThan":"5.19","versionType":"semver"},{"version":"5.19.2","status":"affected","lessThan":"5.20","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/sf-pdma/sf-pdma.c","drivers/dma/sf-pdma/sf-pdma.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"5.15.99","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.16","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2.3","status":"unaffected","lessThanOrEqual":"6.2.*","versionType":"semver"},{"version":"6.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/sf-pdma/sf-pdma.c","drivers/dma/sf-pdma/sf-pdma.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/ad222c9af25e3f074c180e389b3477dce42afc4f"},{"url":"https://git.kernel.org/stable/c/03fece43fa109beba7cc9948c02f5e2d1205d607"},{"url":"https://git.kernel.org/stable/c/8bd5040bd43f2b5ba3c898b09a3197a0c7ace126"},{"url":"https://git.kernel.org/stable/c/b02e07015a5ac7bbc029da931ae17914b8ae0339"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-23T15:31:58.250Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.61","versionEndExcluding":"5.15.99"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.1.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.2.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.137"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.18.18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}