{"cve":"CVE-2026-89515","nvd":{"published":"2026-09-11T20:19:34.040","modified":"2026-10-19T09:17:45.930","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: core: Fill in DMA padding bytes in scsi_alloc_sgtables()\n\nDuring fuzz testing, the following issue was discovered:\n\nBUG: KMSAN: uninit-value in __dma_map_sg_attrs+0x217/0x310\n __dma_map_sg_attrs+0x217/0x310\n dma_map_sg_attrs+0x4a/0x70\n ata_qc_issue+0x9f8/0x1420\n __ata_scsi_queuecmd+0x1657/0x1740\n ata_scsi_queuecmd+0x79a/0x920\n scsi_queue_rq+0x4472/0x4f40\n blk_mq_dispatch_rq_list+0x1cca/0x3ee0\n __blk_mq_sched_dispatch_requests+0x458/0x630\n blk_mq_sched_dispatch_requests+0x15b/0x340\n __blk_mq_run_hw_queue+0xe5/0x250\n __blk_mq_delay_run_hw_queue+0x138/0x780\n blk_mq_run_hw_queue+0x4bb/0x7e0\n blk_mq_sched_insert_request+0x2a7/0x4c0\n blk_execute_rq+0x497/0x8a0\n sg_io+0xbe0/0xe20\n scsi_ioctl+0x2b36/0x3c60\n sr_block_ioctl+0x319/0x440\n blkdev_ioctl+0x80f/0xd70\n __se_sys_ioctl+0x219/0x420\n __x64_sys_ioctl+0x93/0xe0\n x64_sys_call+0x1d6c/0x3ad0\n do_syscall_64+0x4c/0xa0\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n\nUninit was created at:\n __alloc_pages+0x5c0/0xc80\n alloc_pages+0xe0e/0x1050\n blk_rq_map_user_iov+0x2b77/0x6100\n blk_rq_map_user_io+0x2fa/0x4d0\n sg_io+0xad6/0xe20\n scsi_ioctl+0x2b36/0x3c60\n sr_block_ioctl+0x319/0x440\n blkdev_ioctl+0x80f/0xd70\n __se_sys_ioctl+0x219/0x420\n __x64_sys_ioctl+0x93/0xe0\n x64_sys_call+0x1d6c/0x3ad0\n do_syscall_64+0x4c/0xa0\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n\nBytes 14-15 of 16 are uninitialized\nMemory access of size 16 starts at ffff88800cbdb000\n\nWhen processing the last unaligned element of the scatterlist, it is\nsupplemented with missing bytes in the amount of pad_len.  These bytes\nremain uninitialized, which leads to a problem.\n\nExtend last_sg->length by pad_len first, then use sg_zero_buffer() to\nzero those pad_len bytes.  sg_zero_buffer() uses sg_miter internally,\nwhich correctly handles sg entries spanning multiple pages and padding\nthat crosses a page boundary.\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/1aa6df61cef1f47f503c3ccf60d08c4dd931fdc1","https://git.kernel.org/stable/c/28ed5343666ff424ce5e248fa1c5a402303b4aff","https://git.kernel.org/stable/c/626147717bea776b61ed3631d2c26283760c4cc4","https://git.kernel.org/stable/c/6da140ebdfdd6aa3773945f2c0ebba01d2ef33d8","https://git.kernel.org/stable/c/6fd1cce5018fdcc8d928e00a6a1dd2997d5b9409"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:53:43.293028046+00:00"},"epss":{"cve":"CVE-2026-89515","score":0.00177,"percentile":0.07149,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}