CVE-2026-89515

CVE CVE-2026-89515EUVD EUVD-2026-76421Published 2026-09-11T19:43:59.000ZLast changed 2026-09-14T12:00:39.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: scsi: core: Fill in DMA padding bytes in scsi_alloc_sgtables() During fuzz testing, the following issue was discovered: BUG: KMSAN: uninit-value in __dma_map_sg_attrs+0x217/0x310 __dma_map_sg_attrs+0x217/0x310 dma_map_sg_attrs+0x4a/0x70 ata_qc_issue+0x9f8/0x1420 __ata_scsi_queuecmd+0x1657/0x1740 ata_scsi_queuecmd+0x79a/0x920 scsi_queue_rq+0x4472/0x4f40 blk_mq_dispatch_rq_list+0x1cca/0x3ee0 __blk_mq_sched_dispatch_requests+0x458/0x630 blk_mq_sched_dispatch_requests+0x15b/0x340 __blk_mq_run_hw_queue+0xe5/0x250 __blk_mq_delay_run_hw_queue+0x138/0x780 blk_mq_run_hw_queue+0x4bb/0x7e0 blk_mq_sched_insert_request+0x2a7/0x4c0 blk_execute_rq+0x497/0x8a0 sg_io+0xbe0/0xe20 scsi_ioctl+0x2b36/0x3c60 sr_block_ioctl+0x319/0x440 blkdev_ioctl+0x80f/0xd70 __se_sys_ioctl+0x219/0x420 __x64_sys_ioctl+0x93/0xe0 x64_sys_call+0x1d6c/0x3ad0 do_syscall_64+0x4c/0xa0 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 Uninit was created at: __alloc_pages+0x5c0/0xc80 alloc_pages+0xe0e/0x1050 blk_rq_map_user_iov+0x2b77/0x6100 blk_rq_map_user_io+0x2fa/0x4d0 sg_io+0xad6/0xe20 scsi_ioctl+0x2b36/0x3c60 sr_block_ioctl+0x319/0x440 blkdev_ioctl+0x80f/0xd70 __se_sys_ioctl+0x219/0x420 __x64_sys_ioctl+0x93/0xe0 x64_sys_call+0x1d6c/0x3ad0 do_syscall_64+0x4c/0xa0 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 Bytes 14-15 of 16 are uninitialized Memory access of size 16 starts at ffff88800cbdb000 When processing the last unaligned element of the scatterlist, it is supplemented with missing bytes in the amount of pad_len. These bytes remain uninitialized, which leads to a problem. Extend last_sg->length by pad_len first, then use sg_zero_buffer() to zero those pad_len bytes. sg_zero_buffer() uses sg_miter internally, which correctly handles sg entries spanning multiple pages and padding that crosses a page boundary. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux patch: 5.10.270; patch: 7.3-rc1; 40b01b9bbdf51ae543a04744283bf2d56c4a6afa <626147717bea776b61ed3631d2c26283760c4cc4; 40b01b9bbdf51ae543a04744283bf2d56c4a6afa <28ed5343666ff424ce5e248fa1c5a402303b4aff; patch: 0; 40b01b9bbdf51ae543a04744283bf2d56c4a6afa <6fd1cce5018fdcc8d928e00a6a1dd2997d5b9409; 2.6.25; patch: 6.6.157; 40b01b9bbdf51ae543a04744283bf2d56c4a6afa <a4353ec7742bdf87dcdde5875270feb3a1982a51; patch: 7.2.4; 40b01b9bbdf51ae543a04744283bf2d56c4a6afa <1aa6df61cef1f47f503c3ccf60d08c4dd931fdc1; patch: 6.1.188; patch: 6.12.109; 40b01b9bbdf51ae543a04744283bf2d56c4a6afa <e7143c3f4e5c0a7986733c6f27009274bf6c4264; patch: 6.18.50; 40b01b9bbdf51ae543a04744283bf2d56c4a6afa <6da140ebdfdd6aa3773945f2c0ebba01d2ef33d8; 40b01b9bbdf51ae543a04744283bf2d56c4a6afa <fd2cbe08c6ccba7fc1ddb830653a93bb7e2d833c; patch: 5.15.221

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

Patchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.