{"id":"CVE-2023-53513","state":"PUBLISHED","title":"nbd: fix incomplete validation of ioctl arg","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: fix incomplete validation of ioctl arg\n\nWe tested and found an alarm caused by nbd_ioctl arg without verification.\nThe UBSAN warning calltrace like below:\n\nUBSAN: Undefined behaviour in fs/buffer.c:1709:35\nsigned integer overflow:\n-9223372036854775808 - 1 cannot be represented in type 'long long int'\nCPU: 3 PID: 2523 Comm: syz-executor.0 Not tainted 4.19.90 #1\nHardware name: linux,dummy-virt (DT)\nCall trace:\n dump_backtrace+0x0/0x3f0 arch/arm64/kernel/time.c:78\n show_stack+0x28/0x38 arch/arm64/kernel/traps.c:158\n __dump_stack lib/dump_stack.c:77 [inline]\n dump_stack+0x170/0x1dc lib/dump_stack.c:118\n ubsan_epilogue+0x18/0xb4 lib/ubsan.c:161\n handle_overflow+0x188/0x1dc lib/ubsan.c:192\n __ubsan_handle_sub_overflow+0x34/0x44 lib/ubsan.c:206\n __block_write_full_page+0x94c/0xa20 fs/buffer.c:1709\n block_write_full_page+0x1f0/0x280 fs/buffer.c:2934\n blkdev_writepage+0x34/0x40 fs/block_dev.c:607\n __writepage+0x68/0xe8 mm/page-writeback.c:2305\n write_cache_pages+0x44c/0xc70 mm/page-writeback.c:2240\n generic_writepages+0xdc/0x148 mm/page-writeback.c:2329\n blkdev_writepages+0x2c/0x38 fs/block_dev.c:2114\n do_writepages+0xd4/0x250 mm/page-writeback.c:2344\n\nThe reason for triggering this warning is __block_write_full_page()\n-> i_size_read(inode) - 1 overflow.\ninode->i_size is assigned in __nbd_ioctl() -> nbd_set_size() -> bytesize.\nWe think it is necessary to limit the size of arg to prevent errors.\n\nMoreover, __nbd_ioctl() -> nbd_add_socket(), arg will be cast to int.\nAssuming the value of arg is 0x80000000000000001) (on a 64-bit machine),\nit will become 1 after the coercion, which will return unexpected results.\n\nFix it by adding checks to prevent passing in too large numbers.","publishedAt":"2025-10-01T11:46:01.717Z","updatedAt":"2026-06-11T18:44:23.322Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b9c495bb6d8edc719fd23af2ac67de8303cfc1e8","status":"affected","lessThan":"52851d0c3354b397c11d31dfeb8b2a2fc85a0002","versionType":"git"},{"version":"b9c495bb6d8edc719fd23af2ac67de8303cfc1e8","status":"affected","lessThan":"fab766c8a1aff715bce7075aab40e780266f8e1a","versionType":"git"},{"version":"b9c495bb6d8edc719fd23af2ac67de8303cfc1e8","status":"affected","lessThan":"ffb75ffaa68723276365d0f9d00b03362b750657","versionType":"git"},{"version":"b9c495bb6d8edc719fd23af2ac67de8303cfc1e8","status":"affected","lessThan":"55793ea54d77719a071b1ccc05a05056e3b5e009","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/nbd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.1","versionType":"semver"},{"version":"5.15.113","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.30","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.3.4","status":"unaffected","lessThanOrEqual":"6.3.*","versionType":"semver"},{"version":"6.4","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/nbd.c"]}],"references":["https://git.kernel.org/stable/c/52851d0c3354b397c11d31dfeb8b2a2fc85a0002","https://git.kernel.org/stable/c/fab766c8a1aff715bce7075aab40e780266f8e1a","https://git.kernel.org/stable/c/ffb75ffaa68723276365d0f9d00b03362b750657","https://git.kernel.org/stable/c/55793ea54d77719a071b1ccc05a05056e3b5e009"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/53xxx/CVE-2023-53513.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-53513","state":"PUBLISHED","datePublished":"2025-10-01T11:46:01.717Z","dateUpdated":"2026-06-11T18:44:23.322Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-10-01T11:39:39.406Z"},"containers":{"cna":{"title":"nbd: fix incomplete validation of ioctl arg","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: fix incomplete validation of ioctl arg\n\nWe tested and found an alarm caused by nbd_ioctl arg without verification.\nThe UBSAN warning calltrace like below:\n\nUBSAN: Undefined behaviour in fs/buffer.c:1709:35\nsigned integer overflow:\n-9223372036854775808 - 1 cannot be represented in type 'long long int'\nCPU: 3 PID: 2523 Comm: syz-executor.0 Not tainted 4.19.90 #1\nHardware name: linux,dummy-virt (DT)\nCall trace:\n dump_backtrace+0x0/0x3f0 arch/arm64/kernel/time.c:78\n show_stack+0x28/0x38 arch/arm64/kernel/traps.c:158\n __dump_stack lib/dump_stack.c:77 [inline]\n dump_stack+0x170/0x1dc lib/dump_stack.c:118\n ubsan_epilogue+0x18/0xb4 lib/ubsan.c:161\n handle_overflow+0x188/0x1dc lib/ubsan.c:192\n __ubsan_handle_sub_overflow+0x34/0x44 lib/ubsan.c:206\n __block_write_full_page+0x94c/0xa20 fs/buffer.c:1709\n block_write_full_page+0x1f0/0x280 fs/buffer.c:2934\n blkdev_writepage+0x34/0x40 fs/block_dev.c:607\n __writepage+0x68/0xe8 mm/page-writeback.c:2305\n write_cache_pages+0x44c/0xc70 mm/page-writeback.c:2240\n generic_writepages+0xdc/0x148 mm/page-writeback.c:2329\n blkdev_writepages+0x2c/0x38 fs/block_dev.c:2114\n do_writepages+0xd4/0x250 mm/page-writeback.c:2344\n\nThe reason for triggering this warning is __block_write_full_page()\n-> i_size_read(inode) - 1 overflow.\ninode->i_size is assigned in __nbd_ioctl() -> nbd_set_size() -> bytesize.\nWe think it is necessary to limit the size of arg to prevent errors.\n\nMoreover, __nbd_ioctl() -> nbd_add_socket(), arg will be cast to int.\nAssuming the value of arg is 0x80000000000000001) (on a 64-bit machine),\nit will become 1 after the coercion, which will return unexpected results.\n\nFix it by adding checks to prevent passing in too large numbers."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b9c495bb6d8edc719fd23af2ac67de8303cfc1e8","status":"affected","lessThan":"52851d0c3354b397c11d31dfeb8b2a2fc85a0002","versionType":"git"},{"version":"b9c495bb6d8edc719fd23af2ac67de8303cfc1e8","status":"affected","lessThan":"fab766c8a1aff715bce7075aab40e780266f8e1a","versionType":"git"},{"version":"b9c495bb6d8edc719fd23af2ac67de8303cfc1e8","status":"affected","lessThan":"ffb75ffaa68723276365d0f9d00b03362b750657","versionType":"git"},{"version":"b9c495bb6d8edc719fd23af2ac67de8303cfc1e8","status":"affected","lessThan":"55793ea54d77719a071b1ccc05a05056e3b5e009","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/nbd.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.1","versionType":"semver"},{"version":"5.15.113","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.30","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.3.4","status":"unaffected","lessThanOrEqual":"6.3.*","versionType":"semver"},{"version":"6.4","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/block/nbd.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/52851d0c3354b397c11d31dfeb8b2a2fc85a0002"},{"url":"https://git.kernel.org/stable/c/fab766c8a1aff715bce7075aab40e780266f8e1a"},{"url":"https://git.kernel.org/stable/c/ffb75ffaa68723276365d0f9d00b03362b750657"},{"url":"https://git.kernel.org/stable/c/55793ea54d77719a071b1ccc05a05056e3b5e009"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:46:25.690Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"5.15.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"6.1.30"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"6.3.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.1","versionEndExcluding":"6.4"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2023-53513","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-06-10T20:42:26.842536Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-11T18:44:23.322Z"}}]}}}