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FKIE_CVE-2026-89515

Vulnerability from fkie_nvd - Published: 2026-09-11 20:19 - Updated: 2026-09-14 13:19
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1aa6df61cef1f47f503c3ccf60d08c4dd931fdc1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/28ed5343666ff424ce5e248fa1c5a402303b4aff
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/626147717bea776b61ed3631d2c26283760c4cc4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6da140ebdfdd6aa3773945f2c0ebba01d2ef33d8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6fd1cce5018fdcc8d928e00a6a1dd2997d5b9409
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a4353ec7742bdf87dcdde5875270feb3a1982a51
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e7143c3f4e5c0a7986733c6f27009274bf6c4264
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fd2cbe08c6ccba7fc1ddb830653a93bb7e2d833c
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/scsi_lib.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1aa6df61cef1f47f503c3ccf60d08c4dd931fdc1",
              "status": "affected",
              "version": "40b01b9bbdf51ae543a04744283bf2d56c4a6afa",
              "versionType": "git"
            },
            {
              "lessThan": "6da140ebdfdd6aa3773945f2c0ebba01d2ef33d8",
              "status": "affected",
              "version": "40b01b9bbdf51ae543a04744283bf2d56c4a6afa",
              "versionType": "git"
            },
            {
              "lessThan": "fd2cbe08c6ccba7fc1ddb830653a93bb7e2d833c",
              "status": "affected",
              "version": "40b01b9bbdf51ae543a04744283bf2d56c4a6afa",
              "versionType": "git"
            },
            {
              "lessThan": "28ed5343666ff424ce5e248fa1c5a402303b4aff",
              "status": "affected",
              "version": "40b01b9bbdf51ae543a04744283bf2d56c4a6afa",
              "versionType": "git"
            },
            {
              "lessThan": "a4353ec7742bdf87dcdde5875270feb3a1982a51",
              "status": "affected",
              "version": "40b01b9bbdf51ae543a04744283bf2d56c4a6afa",
              "versionType": "git"
            },
            {
              "lessThan": "e7143c3f4e5c0a7986733c6f27009274bf6c4264",
              "status": "affected",
              "version": "40b01b9bbdf51ae543a04744283bf2d56c4a6afa",
              "versionType": "git"
            },
            {
              "lessThan": "6fd1cce5018fdcc8d928e00a6a1dd2997d5b9409",
              "status": "affected",
              "version": "40b01b9bbdf51ae543a04744283bf2d56c4a6afa",
              "versionType": "git"
            },
            {
              "lessThan": "626147717bea776b61ed3631d2c26283760c4cc4",
              "status": "affected",
              "version": "40b01b9bbdf51ae543a04744283bf2d56c4a6afa",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/scsi_lib.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.25"
            },
            {
              "lessThan": "2.6.25",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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-\u003elength 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."
    }
  ],
  "id": "CVE-2026-89515",
  "lastModified": "2026-09-14T13:19:07.970",
  "metrics": {},
  "published": "2026-09-11T20:19:34.040",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1aa6df61cef1f47f503c3ccf60d08c4dd931fdc1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/28ed5343666ff424ce5e248fa1c5a402303b4aff"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/626147717bea776b61ed3631d2c26283760c4cc4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6da140ebdfdd6aa3773945f2c0ebba01d2ef33d8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6fd1cce5018fdcc8d928e00a6a1dd2997d5b9409"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a4353ec7742bdf87dcdde5875270feb3a1982a51"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e7143c3f4e5c0a7986733c6f27009274bf6c4264"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fd2cbe08c6ccba7fc1ddb830653a93bb7e2d833c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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