{"id":"CVE-2023-52492","state":"PUBLISHED","title":"dmaengine: fix NULL pointer in channel unregistration function","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: fix NULL pointer in channel unregistration function\n\n__dma_async_device_channel_register() can fail. In case of failure,\nchan->local is freed (with free_percpu()), and chan->local is nullified.\nWhen dma_async_device_unregister() is called (because of managed API or\nintentionally by DMA controller driver), channels are unconditionally\nunregistered, leading to this NULL pointer:\n[    1.318693] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000d0\n[...]\n[    1.484499] Call trace:\n[    1.486930]  device_del+0x40/0x394\n[    1.490314]  device_unregister+0x20/0x7c\n[    1.494220]  __dma_async_device_channel_unregister+0x68/0xc0\n\nLook at dma_async_device_register() function error path, channel device\nunregistration is done only if chan->local is not NULL.\n\nThen add the same condition at the beginning of\n__dma_async_device_channel_unregister() function, to avoid NULL pointer\nissue whatever the API used to reach this function.","publishedAt":"2024-02-29T15:52:10.499Z","updatedAt":"2026-05-11T19:28:23.034Z","severity":{"score":4.4,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d2fb0a0438384fee08a418025f743913020033ce","status":"affected","lessThan":"9de69732dde4e443c1c7f89acbbed2c45a6a8e17","versionType":"git"},{"version":"d2fb0a0438384fee08a418025f743913020033ce","status":"affected","lessThan":"047fce470412ab64cb7345f9ff5d06919078ad79","versionType":"git"},{"version":"d2fb0a0438384fee08a418025f743913020033ce","status":"affected","lessThan":"2ab32986a0b9e329eb7f8f04dd57cc127f797c08","versionType":"git"},{"version":"d2fb0a0438384fee08a418025f743913020033ce","status":"affected","lessThan":"7f0ccfad2031eddcc510caf4e57f2d4aa2d8a50b","versionType":"git"},{"version":"d2fb0a0438384fee08a418025f743913020033ce","status":"affected","lessThan":"9263fd2a63487c6d04cbb7b74a48fb12e1e352d0","versionType":"git"},{"version":"d2fb0a0438384fee08a418025f743913020033ce","status":"affected","lessThan":"f5c24d94512f1b288262beda4d3dcb9629222fc7","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/dmaengine.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.6","versionType":"semver"},{"version":"5.10.210","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.149","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.76","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.15","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.3","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/dmaengine.c"]}],"references":["https://git.kernel.org/stable/c/9de69732dde4e443c1c7f89acbbed2c45a6a8e17","https://git.kernel.org/stable/c/047fce470412ab64cb7345f9ff5d06919078ad79","https://git.kernel.org/stable/c/2ab32986a0b9e329eb7f8f04dd57cc127f797c08","https://git.kernel.org/stable/c/7f0ccfad2031eddcc510caf4e57f2d4aa2d8a50b","https://git.kernel.org/stable/c/9263fd2a63487c6d04cbb7b74a48fb12e1e352d0","https://git.kernel.org/stable/c/f5c24d94512f1b288262beda4d3dcb9629222fc7","https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/52xxx/CVE-2023-52492.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-52492","state":"PUBLISHED","datePublished":"2024-02-29T15:52:10.499Z","dateUpdated":"2026-05-11T19:28:23.034Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-02-20T12:30:33.304Z"},"containers":{"cna":{"title":"dmaengine: fix NULL pointer in channel unregistration function","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: fix NULL pointer in channel unregistration function\n\n__dma_async_device_channel_register() can fail. In case of failure,\nchan->local is freed (with free_percpu()), and chan->local is nullified.\nWhen dma_async_device_unregister() is called (because of managed API or\nintentionally by DMA controller driver), channels are unconditionally\nunregistered, leading to this NULL pointer:\n[    1.318693] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000d0\n[...]\n[    1.484499] Call trace:\n[    1.486930]  device_del+0x40/0x394\n[    1.490314]  device_unregister+0x20/0x7c\n[    1.494220]  __dma_async_device_channel_unregister+0x68/0xc0\n\nLook at dma_async_device_register() function error path, channel device\nunregistration is done only if chan->local is not NULL.\n\nThen add the same condition at the beginning of\n__dma_async_device_channel_unregister() function, to avoid NULL pointer\nissue whatever the API used to reach this function."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d2fb0a0438384fee08a418025f743913020033ce","status":"affected","lessThan":"9de69732dde4e443c1c7f89acbbed2c45a6a8e17","versionType":"git"},{"version":"d2fb0a0438384fee08a418025f743913020033ce","status":"affected","lessThan":"047fce470412ab64cb7345f9ff5d06919078ad79","versionType":"git"},{"version":"d2fb0a0438384fee08a418025f743913020033ce","status":"affected","lessThan":"2ab32986a0b9e329eb7f8f04dd57cc127f797c08","versionType":"git"},{"version":"d2fb0a0438384fee08a418025f743913020033ce","status":"affected","lessThan":"7f0ccfad2031eddcc510caf4e57f2d4aa2d8a50b","versionType":"git"},{"version":"d2fb0a0438384fee08a418025f743913020033ce","status":"affected","lessThan":"9263fd2a63487c6d04cbb7b74a48fb12e1e352d0","versionType":"git"},{"version":"d2fb0a0438384fee08a418025f743913020033ce","status":"affected","lessThan":"f5c24d94512f1b288262beda4d3dcb9629222fc7","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/dmaengine.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.6","versionType":"semver"},{"version":"5.10.210","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.149","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.76","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.15","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.3","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dma/dmaengine.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/9de69732dde4e443c1c7f89acbbed2c45a6a8e17"},{"url":"https://git.kernel.org/stable/c/047fce470412ab64cb7345f9ff5d06919078ad79"},{"url":"https://git.kernel.org/stable/c/2ab32986a0b9e329eb7f8f04dd57cc127f797c08"},{"url":"https://git.kernel.org/stable/c/7f0ccfad2031eddcc510caf4e57f2d4aa2d8a50b"},{"url":"https://git.kernel.org/stable/c/9263fd2a63487c6d04cbb7b74a48fb12e1e352d0"},{"url":"https://git.kernel.org/stable/c/f5c24d94512f1b288262beda4d3dcb9629222fc7"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:28:23.034Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.10.210"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.15.149"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.1.76"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.6.15"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.8"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA 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