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            "url": "https://git.kernel.org/stable/c/16198eef11c1929374381d7f6271b4bf6aa44615"
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              "content": {
                "id": "CVE-2024-41026",
                "options": [
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                "timestamp": "2024-09-10T16:24:09.083090Z",
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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    "cna": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/mmc/host/davinci_mmc.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: davinci_mmc: Prevent transmitted data size from exceeding sgm\u0027s length\n\nNo check is done on the size of the data to be transmiited. This causes\na kernel panic when this size exceeds the sg_miter\u0027s length.\n\nLimit the number of transmitted bytes to sgm-\u003elength."
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "lang": "en",
              "value": "AV:L - The vulnerable PIO path is reached through local device I/O \u2014 `MMC_IOC_CMD`/`MMC_IOC_MULTI_CMD` on the mmcblk block device or the RPMB character device \u2014 with no network or physical component required. No remote or adjacent-network protocol touches this driver.\nAC:L - The attacker deterministically selects `blksz`/`blocks` so that `blocks*blksz` is not a multiple of `rw_threshold`, which forces the PIO fallback in `mmc_davinci_prepare_data()` and makes the unclamped 32-byte priming transfer overrun a smaller scatterlist chunk on the first attempt. There is no race, no memory-layout guess, and no condition outside the attacker\u0027s control.\nPR:L - `mmc_rpmb_ioctl()` dispatches `MMC_IOC_CMD` into `mmc_blk_ioctl_cmd()` without any `capable()` check, so any user holding an open descriptor to `/dev/mmcblk*rpmb` \u2014 routinely group-accessible on embedded and Android-class deployments of this SoC family \u2014 can drive arbitrary `blksz`/`blocks` transfers. No administrative capability is needed on that path.\nUI:N - The attacker issues the ioctl directly against an already-present card; no victim action, card insertion, or mount is required.\nS:U - The out-of-bounds access corrupts and discloses kernel heap memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - In the write direction the driver reads far past the end of the kmalloc\u0027d/kmapped buffer and streams that kernel memory into the MMC data register, and the underflowed `bytes_left`/`__remaining` turn this into an effectively unbounded sequential read of kernel memory (data landing inside the programmed transfer window is persisted to attacker-controlled card storage and read back). This is not a bounded few-byte leak.\nI:H - The same missing clamp in the read direction writes card-supplied bytes past the destination chunk, and once `sg_miter`\u0027s `__remaining`/`__offset` and `host-\u003ebytes_left` underflow the driver writes attacker-influenced data far beyond the mapped page \u2014 an out-of-bounds heap write suitable for corrupting adjacent slab objects.\nA:H - The commit message states outright that exceeding the sg_miter length causes a kernel panic; the underflowed `host-\u003ebytes_left` also drives a multi-gigabyte copy loop in hard IRQ context that faults off the end of the mapping, giving a reliable oops/lockup."
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/c561c4ecce712f94b442db5960e281f13b28df2e"
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        {
          "url": "https://git.kernel.org/stable/c/16198eef11c1929374381d7f6271b4bf6aa44615"
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      ],
      "title": "mmc: davinci_mmc: Prevent transmitted data size from exceeding sgm\u0027s length",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-41026",
    "datePublished": "2024-07-29T14:31:43.056Z",
    "dateReserved": "2024-07-12T12:17:45.616Z",
    "dateUpdated": "2026-08-05T11:34:48.544Z",
    "state": "PUBLISHED"
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