{"id":"CVE-2023-54020","summary":"dmaengine: sf-pdma: pdma_desc memory leak fix","details":"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    [\u003c00000000064a04f4\u003e] kmemleak_alloc+0x1e/0x28\n    [\u003c00000000018927a7\u003e] kmem_cache_alloc+0x11e/0x178\n    [\u003c000000002aea8d16\u003e] sf_pdma_prep_dma_memcpy+0x40/0x112\n\nAdd the missing kfree() to sf_pdma_free_desc(), and remove the redundant\nin_use flag.","modified":"2026-04-02T09:45:30.003844Z","published":"2025-12-24T10:55:50.583Z","related":["SUSE-SU-2026:0263-1","SUSE-SU-2026:0317-1","SUSE-SU-2026:0411-1","SUSE-SU-2026:0617-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54020.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/03fece43fa109beba7cc9948c02f5e2d1205d607"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8bd5040bd43f2b5ba3c898b09a3197a0c7ace126"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ad222c9af25e3f074c180e389b3477dce42afc4f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b02e07015a5ac7bbc029da931ae17914b8ae0339"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54020.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-54020"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5ab2782c944e324008ef5d658f2494a9f0e3c5ac"},{"fixed":"ad222c9af25e3f074c180e389b3477dce42afc4f"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc"},{"fixed":"03fece43fa109beba7cc9948c02f5e2d1205d607"},{"fixed":"8bd5040bd43f2b5ba3c898b09a3197a0c7ace126"},{"fixed":"b02e07015a5ac7bbc029da931ae17914b8ae0339"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"b9b4992f897be9b0b9e3a3b956cab6b75ccc3f11"},{"last_affected":"4c7350b1dd8a192af844de32fc99b9e34c876fda"},{"last_affected":"a93b3f1e11971a91b6441b6d47488f4492cc113f"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54020.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.99"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.16"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.0.0"},{"fixed":"6.2.3"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54020.json"}}],"schema_version":"1.7.5"}