{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80748", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.790Z", "datePublished": "2026-09-03T08:26:29.532Z", "dateUpdated": "2026-09-04T04:58:28.127Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-04T04:58:28.127Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: loongson2: Fix sg iteration in data reorder functions\n\nIn ls2k0500_mmc_reorder_cmd_data() and ls2k2000_mmc_reorder_cmd_data(),\nthe for_each_sg() macro already iterates over the scatterlist entries,\nwith 'sg' pointing to the current entry. However, the code incorrectly\nuses '&sg[i]' and 'sg_dma_len(&sg[i])' inside the loop, which treats\n'sg' as an array base and indexes it again, leading to access of\nwrong sg entries (or out-of-bounds if the list is not an array)."}], "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 flaw is in the Loongson-2K MMC host driver reached via local block I/O and MMC ioctls (SD writes trigger SD_APP_SEND_NUM_WR_BLKS; card init issues SD_SWITCH/SCR), not via any network protocol; it affects LoongArch desktops, kiosks, and embedded systems with SD/eMMC slots.\nAC:L - An attacker with SD-backed storage access can reliably drive the post-DMA reorder path on every qualifying transfer; the double-indexed for_each_sg bug deterministically accesses wrong scatterlist entries whenever sg_len exceeds one, without races or uncontrollable memory layout.\nPR:L - Any unprivileged local user writing to an SD-backed filesystem or opening the mmc block device can trigger the vulnerable reorder functions; no CAP_SYS_ADMIN, init-namespace root, or user-namespace capability is required.\nUI:N - Exploitation requires only the attacker's own writes, MMC_IOC_CMD ioctl sequences, or kernel auto-enumeration after SD insertion; no separate victim mount, login, or cooperative action is needed.\nS:U - Scatterlist mis-indexing corrupts kernel heap memory within the host kernel security boundary; this is standard local privilege-escalation impact, not VM escape, IOMMU bypass, or cross-container authority change.\nC:H - sg_virt(&sg[i]) on a mis-advanced pointer reads from wrong or out-of-bounds scatterlist entries, exposing adjacent kernel memory; out-of-bounds reads are rated High and can leak pointers usable for further exploitation.\nI:H - The reorder loop writes bitrev8x4/cpu_to_be32-transformed values through the mis-indexed scatterlist pointer, performing out-of-bounds kernel memory writes that can corrupt adjacent objects and enable arbitrary code execution.\nA:H - Corrupting adjacent kernel structures via the out-of-bounds scatterlist write can cause immediate kernel oops or panic; memory corruption bugs in interrupt context are rated High availability impact even when not fully weaponized."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/mmc/host/loongson2-mmc.c"], "versions": [{"version": "2115772014bdac368317e997ed15016cf2792665", "lessThan": "8f7f7a6d5aed8f346a1c936fba02033c73a337dc", "status": "affected", "versionType": "git"}, {"version": "2115772014bdac368317e997ed15016cf2792665", "lessThan": "db368164383c46f256ed8152a41ae9300e615028", "status": "affected", "versionType": "git"}, {"version": "2115772014bdac368317e997ed15016cf2792665", "lessThan": "00179ed9fbe07799676e2cb63c4e7f0e7cd80a5c", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/mmc/host/loongson2-mmc.c"], "versions": [{"version": "6.17", "status": "affected"}, {"version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.46", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.10", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "6.17", "versionEndExcluding": "6.18.46"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.1.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8f7f7a6d5aed8f346a1c936fba02033c73a337dc"}, {"url": "https://git.kernel.org/stable/c/db368164383c46f256ed8152a41ae9300e615028"}, {"url": "https://git.kernel.org/stable/c/00179ed9fbe07799676e2cb63c4e7f0e7cd80a5c"}], "title": "mmc: loongson2: Fix sg iteration in data reorder functions", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/mmc/host/loongson2-mmc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "8f7f7a6d5aed8f346a1c936fba02033c73a337dc", "status": "affected", "version": "2115772014bdac368317e997ed15016cf2792665", "versionType": "git"}, {"lessThan": "db368164383c46f256ed8152a41ae9300e615028", "status": "affected", "version": "2115772014bdac368317e997ed15016cf2792665", "versionType": "git"}, {"lessThan": "00179ed9fbe07799676e2cb63c4e7f0e7cd80a5c", "status": "affected", "version": "2115772014bdac368317e997ed15016cf2792665", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/mmc/host/loongson2-mmc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.17"}, {"lessThan": "6.17", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.46", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "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\nmmc: loongson2: Fix sg iteration in data reorder functions\n\nIn ls2k0500_mmc_reorder_cmd_data() and ls2k2000_mmc_reorder_cmd_data(),\nthe for_each_sg() macro already iterates over the scatterlist entries,\nwith 'sg' pointing to the current entry. However, the code incorrectly\nuses '&sg[i]' and 'sg_dma_len(&sg[i])' inside the loop, which treats\n'sg' as an array base and indexes it again, leading to access of\nwrong sg entries (or out-of-bounds if the list is not an array)."}], "id": "CVE-2026-80748", "lastModified": "2026-09-04T05:17:14.773", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-03T13:06:14.410", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/00179ed9fbe07799676e2cb63c4e7f0e7cd80a5c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8f7f7a6d5aed8f346a1c936fba02033c73a337dc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/db368164383c46f256ed8152a41ae9300e615028"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}