{"dataType":"CVE_RECORD","cveMetadata":{"cveId":"CVE-2024-35813","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-05-17T12:19:12.343Z","datePublished":"2024-05-17T13:23:18.902Z","dateUpdated":"2026-08-05T11:30:06.940Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:30:06.940Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: core: Avoid negative index with array access\n\nCommit 4d0c8d0aef63 (\"mmc: core: Use mrq.sbc in close-ended ffu\") assigns\nprev_idata = idatas[i - 1], but doesn't check that the iterator i is\ngreater than zero. Let's fix this by adding a check."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The bug is reached only via the MMC_IOC_CMD / MMC_IOC_MULTI_CMD ioctls on the local /dev/mmcblkN block device or the /dev/mmcblkNrpmb character device. There is no remote or adjacent-network path into drivers/mmc/core/block.c.\nAC:L - Triggering requires the uninitialized `flags` field (kmalloc'd throughout the affected range) to have MMC_BLK_IOC_SBC set on the first command, which the attacker controls by grooming the kmalloc-96/128 slab before the ioctl, and which can be retried in a tight loop at no cost. The subsequent `idatas[-1]` neighbor (an adjacent kmalloc-8 object or a live stack slot) is likewise attacker-influenceable via standard heap/stack spraying.\nPR:L - The RPMB character-device entry point (mmc_rpmb_ioctl → mmc_blk_ioctl_cmd/mmc_blk_ioctl_multi_cmd) performs no capable() check whatsoever — only DAC permissions on /dev/mmcblkNrpmb gate it — and on Android and embedded platforms that node is routinely opened by non-root system daemons, so an unprivileged-but-authorized local process suffices.\nUI:N - The attacker issues the ioctl directly from their own process; no victim action, mount, or file open by another user is needed.\nS:U - The out-of-bounds access and the resulting corruption are entirely within the kernel's own security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The negative index performs an out-of-bounds read of a pointer, and the resulting `prev_idata->ic.arg` dereference reads attacker-chosen kernel memory that is then emitted as the CMD23 argument; more broadly the memory corruption is leverageable for kernel information disclosure.\nI:H - `memcpy(&prev_idata->ic.response, sbc.resp, sizeof(sbc.resp))` performs a 16-byte write through the out-of-bounds-derived pointer, giving a write primitive at a heap-groomable address (or over live kernel pointers on the stack) that is exploitable for privilege escalation.\nA:H - Dereferencing the wild `idatas[-1]` pointer — read at `prev_idata->ic.arg` and write at `prev_idata->ic.response` — reliably produces a kernel oops/panic in the common case where the neighboring memory is not a valid object."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/mmc/core/block.c"],"versions":[{"version":"f49f9e802785291149bdc9c824414de4604226b4","lessThan":"b9a7339ae403035ffe7fc37cb034b36947910f68","status":"affected","versionType":"git"},{"version":"59020bf0999ff7da8aedcd00ef8f0d75d93b6d20","lessThan":"2b539c88940e22494da80a93ee1c5a28bbad10f6","status":"affected","versionType":"git"},{"version":"50b8b7a22e90bab9f1949b64a88ff17ab10913ec","lessThan":"81b8645feca08a54c7c4bf36e7b176f4983b2f28","status":"affected","versionType":"git"},{"version":"c4edcd134bb72b3b0acc884612d624e48c9d057f","lessThan":"ad9cc5e9e53ab94aa0c7ac65d43be7eb208dcb55","status":"affected","versionType":"git"},{"version":"1653a8102868264f3488c298a9f20af2add9a288","lessThan":"4466677dcabe2d70de6aa3d4bd4a4fafa94a71f2","status":"affected","versionType":"git"},{"version":"eed9119f8f8e8fbf225c08abdbb58597fba807e0","lessThan":"064db53f9023a2d5877a2d12de6bc27995f6ca56","status":"affected","versionType":"git"},{"version":"4d0c8d0aef6355660b6775d57ccd5d4ea2e15802","lessThan":"7d0e8a6147550aa058fa6ade8583ad252aa61304","status":"affected","versionType":"git"},{"version":"4d0c8d0aef6355660b6775d57ccd5d4ea2e15802","lessThan":"cf55a7acd1ed38afe43bba1c8a0935b51d1dc014","status":"affected","versionType":"git"},{"version":"5.4.269","lessThan":"5.4.274","status":"affected","versionType":"semver"},{"version":"5.10.210","lessThan":"5.10.215","status":"affected","versionType":"semver"},{"version":"5.15.149","lessThan":"5.15.154","status":"affected","versionType":"semver"},{"version":"6.1.76","lessThan":"6.1.84","status":"affected","versionType":"semver"},{"version":"6.6.15","lessThan":"6.6.24","status":"affected","versionType":"semver"},{"version":"6.7.3","lessThan":"6.7.12","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/mmc/core/block.c"],"versions":[{"version":"6.8","status":"affected"},{"version":"0","lessThan":"6.8","status":"unaffected","versionType":"semver"},{"version":"5.4.274","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.215","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.154","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.84","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.24","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.7.12","lessThanOrEqual":"6.7.*","status":"unaffected","versionType":"semver"},{"version":"6.8.3","lessThanOrEqual":"6.8.*","status":"unaffected","versionType":"semver"},{"version":"6.9","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.269","versionEndExcluding":"5.4.274"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.210","versionEndExcluding":"5.10.215"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.149","versionEndExcluding":"5.15.154"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.76","versionEndExcluding":"6.1.84"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.15","versionEndExcluding":"6.6.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7.3","versionEndExcluding":"6.7.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.8.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8","versionEndExcluding":"6.9"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/b9a7339ae403035ffe7fc37cb034b36947910f68"},{"url":"https://git.kernel.org/stable/c/2b539c88940e22494da80a93ee1c5a28bbad10f6"},{"url":"https://git.kernel.org/stable/c/81b8645feca08a54c7c4bf36e7b176f4983b2f28"},{"url":"https://git.kernel.org/stable/c/ad9cc5e9e53ab94aa0c7ac65d43be7eb208dcb55"},{"url":"https://git.kernel.org/stable/c/4466677dcabe2d70de6aa3d4bd4a4fafa94a71f2"},{"url":"https://git.kernel.org/stable/c/064db53f9023a2d5877a2d12de6bc27995f6ca56"},{"url":"https://git.kernel.org/stable/c/7d0e8a6147550aa058fa6ade8583ad252aa61304"},{"url":"https://git.kernel.org/stable/c/cf55a7acd1ed38afe43bba1c8a0935b51d1dc014"}],"title":"mmc: 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