cdrom: rearrange last_media_change check to avoid unintentional overflow

{
  "id": "640ecdd82af7d46d1f0123c361afecf483d4019d01bf5db06ed14374ab5266e6",
  "url": "https://osv.dev/vulnerability/CVE-2024-42136",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "cdrom: rearrange last_media_change check to avoid unintentional overflow",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: cdrom: rearrange last_media_change check to avoid unintentional overflow When running syzkaller with the newly reintroduced signed integer wrap sanitizer we encounter this splat: [ 366.015950] UBSAN: signed-integer-overflow in ../drivers/cdrom/cdrom.c:2361:33 [ 366.021089] -9223372036854775808 - 346321 cannot be represented in type '__s64' (aka 'long long') [ 366.025894] program syz-executor.4 is using a deprecated SCSI ioctl, please convert it to SG_IO [ 366.027502] CPU: 5 PID: 28472 Comm: syz-executor.7 Not tainted 6.8.0-rc2-00035-gb3ef86b5a957 #1 [ 366.027512] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 366.027518] Call Trace: [ 366.027523] [ 366.027533] dump_stack_lvl+0x93/0xd0 [ 366.027899] handle_overflow+0x171/0x1b0 [ 366.038787] ata1.00: invalid multi_count 32 ignored [ 366.043924] cdrom_ioctl+0x2c3f/0x2d10 [ 366.063932] ? __pm_runtime_resume+0xe6/0x130 [ 366.071923] sr_block_ioctl+0x15d/0x1d0 [ 366.074624] ? __pfx_sr_block_ioctl+0x10/0x10 [ 366.077642] blkdev_ioctl+0x419/0x500 [ 366.080231] ? __pfx_blkdev_ioctl+0x10/0x10 ... Historically, the signed integer overflow sanitizer did not work in the kernel due to its interaction with `-fwrapv` but this has since been changed [1] in the newest version of Clang. It was re-enabled in the kernel with Commit 557f8c582a9ba8ab (\"ubsan: Reintroduce signed overflow sanitizer\"). Let's rearrange the check to not p",
    "evidence": "osv:CVE-2024-42136",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.98",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.39",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.9.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2024-42136",
      "aliases": [
        "CVE-2024-42136"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "67f1e027c27054e641584655020a417eaac9cb3a"
                },
                {
                  "fixed": "0c97527e916054acc4a46ffb02842988acb2e92b"
                },
                {
                  "fixed": "3ee21e14c8c329168a0b66bab00ecd18f5d0dee3"
                },
                {
                  "fixed": "e809bc112712da8f7e15822674c6562da6cdf24c"
                },
                {
                  "fixed": "efb905aeb44b0e99c0e6b07865b1885ae0471ebf"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-42136.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.98"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.39"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.9.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-42136.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.370101371Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0c97527e916054acc4a46ffb02842988acb2e92b",
        "https://git.kernel.org/stable/c/3ee21e14c8c329168a0b66bab00ecd18f5d0dee3",
        "https://git.kernel.org/stable/c/e809bc112712da8f7e15822674c6562da6cdf24c",
        "https://git.kernel.org/stable/c/efb905aeb44b0e99c0e6b07865b1885ae0471ebf",
        "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/42xxx/CVE-2024-42136.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-42136",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/42xxx/CVE-2024-42136.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-42136",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 490831,
  "published_at": "2024-07-30T07:46:30.975+00:00"
}