{ "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: core: Avoid negative index with array access", 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