{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-26768", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.173Z", "datePublished": "2024-04-03T17:00:50.135Z", "dateUpdated": "2026-08-05T11:27:07.626Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:27:07.626Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: Change acpi_core_pic[NR_CPUS] to acpi_core_pic[MAX_CORE_PIC]\n\nWith default config, the value of NR_CPUS is 64. When HW platform has\nmore then 64 cpus, system will crash on these platforms. MAX_CORE_PIC\nis the maximum cpu number in MADT table (max physical number) which can\nexceed the supported maximum cpu number (NR_CPUS, max logical number),\nbut kernel should not crash. Kernel should boot cpus with NR_CPUS, let\nthe remainder cpus stay in BIOS.\n\nThe potential crash reason is that the array acpi_core_pic[NR_CPUS] can\nbe overflowed when parsing MADT table, and it is obvious that CORE_PIC\nshould be corresponding to physical core rather than logical core, so it\nis better to define the array as acpi_core_pic[MAX_CORE_PIC].\n\nWith the patch, system can boot up 64 vcpus with qemu parameter -smp 128,\notherwise system will crash with the following message.\n\n[ 0.000000] CPU 0 Unable to handle kernel paging request at virtual address 0000420000004259, era == 90000000037a5f0c, ra == 90000000037a46ec\n[ 0.000000] Oops[#1]:\n[ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 6.8.0-rc2+ #192\n[ 0.000000] Hardware name: QEMU QEMU Virtual Machine, BIOS unknown 2/2/2022\n[ 0.000000] pc 90000000037a5f0c ra 90000000037a46ec tp 9000000003c90000 sp 9000000003c93d60\n[ 0.000000] a0 0000000000000019 a1 9000000003d93bc0 a2 0000000000000000 a3 9000000003c93bd8\n[ 0.000000] a4 9000000003c93a74 a5 9000000083c93a67 a6 9000000003c938f0 a7 0000000000000005\n[ 0.000000] t0 0000420000004201 t1 0000000000000000 t2 0000000000000001 t3 0000000000000001\n[ 0.000000] t4 0000000000000003 t5 0000000000000000 t6 0000000000000030 t7 0000000000000063\n[ 0.000000] t8 0000000000000014 u0 ffffffffffffffff s9 0000000000000000 s0 9000000003caee98\n[ 0.000000] s1 90000000041b0480 s2 9000000003c93da0 s3 9000000003c93d98 s4 9000000003c93d90\n[ 0.000000] s5 9000000003caa000 s6 000000000a7fd000 s7 000000000f556b60 s8 000000000e0a4330\n[ 0.000000] ra: 90000000037a46ec platform_init+0x214/0x250\n[ 0.000000] ERA: 90000000037a5f0c efi_runtime_init+0x30/0x94\n[ 0.000000] CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=CC DACM=CC -WE)\n[ 0.000000] PRMD: 00000000 (PPLV0 -PIE -PWE)\n[ 0.000000] EUEN: 00000000 (-FPE -SXE -ASXE -BTE)\n[ 0.000000] ECFG: 00070800 (LIE=11 VS=7)\n[ 0.000000] ESTAT: 00010000 [PIL] (IS= ECode=1 EsubCode=0)\n[ 0.000000] BADV: 0000420000004259\n[ 0.000000] PRID: 0014c010 (Loongson-64bit, Loongson-3A5000)\n[ 0.000000] Modules linked in:\n[ 0.000000] Process swapper (pid: 0, threadinfo=(____ptrval____), task=(____ptrval____))\n[ 0.000000] Stack : 9000000003c93a14 9000000003800898 90000000041844f8 90000000037a46ec\n[ 0.000000] 000000000a7fd000 0000000008290000 0000000000000000 0000000000000000\n[ 0.000000] 0000000000000000 0000000000000000 00000000019d8000 000000000f556b60\n[ 0.000000] 000000000a7fd000 000000000f556b08 9000000003ca7700 9000000003800000\n[ 0.000000] 9000000003c93e50 9000000003800898 9000000003800108 90000000037a484c\n[ 0.000000] 000000000e0a4330 000000000f556b60 000000000a7fd000 000000000f556b08\n[ 0.000000] 9000000003ca7700 9000000004184000 0000000000200000 000000000e02b018\n[ 0.000000] 000000000a7fd000 90000000037a0790 9000000003800108 0000000000000000\n[ 0.000000] 0000000000000000 000000000e0a4330 000000000f556b60 000000000a7fd000\n[ 0.000000] 000000000f556b08 000000000eaae298 000000000eaa5040 0000000000200000\n[ 0.000000] ...\n[ 0.000000] Call Trace:\n[ 0.000000] [<90000000037a5f0c>] efi_runtime_init+0x30/0x94\n[ 0.000000] [<90000000037a46ec>] platform_init+0x214/0x250\n[ 0.000000] [<90000000037a484c>] setup_arch+0x124/0x45c\n[ 0.000000] [<90000000037a0790>] start_kernel+0x90/0x670\n[ 0.000000] [<900000000378b0d8>] kernel_entry+0xd8/0xdc" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.2, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The overflow is reached only from `__init` MADT parsing during `setup_arch()`, with input supplied by platform firmware, the hypervisor's VM configuration, or a root-supplied initrd ACPI table override — all of which require local control of the machine's boot environment rather than physical presence.\nAC:L - The out-of-bounds store is deterministic — any MADT `Core PIC` entry with `core_id >= NR_CPUS` reliably writes past `acpi_core_pic[]`, with no race to win and no memory layout the attacker cannot already influence.\nPR:H - This is pre-userspace code, so no unprivileged or namespace-based path exists; supplying the MADT requires firmware control, hypervisor/VM-configuration control, or real root to plant an initrd table override (itself blocked under kernel lockdown).\nUI:N - Once the crafted or oversized MADT is in place the corruption occurs automatically on the next boot, with no action required from any other user.\nS:U - The out-of-bounds write corrupts kernel `.bss` within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed by the overflow itself.\nC:H - Writing a 20-byte structure at an unvalidated `u32`-scaled offset corrupts arbitrary adjacent kernel globals, and such memory corruption of early-boot state (EFI/`loongson_sysconf` structures, pointers used later by the kernel) is leverageable to disclose kernel memory.\nI:H - This is a direct out-of-bounds write of attacker/firmware-controlled contents at an attacker-influenced index, giving a powerful write primitive over kernel data — per guidance, OOB writes score High.\nA:H - The documented result is a kernel Oops in `efi_runtime_init` during `start_kernel()`, rendering the system unbootable — a complete availability loss." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/loongarch/include/asm/acpi.h", "arch/loongarch/kernel/acpi.c" ], "versions": [ { "version": "fa96b57c149061f71a70bd6582d995f6424fbbf4", "lessThan": "88e189bd16e5889e44a41b3309558ebab78b9280", "status": "affected", "versionType": "git" }, { "version": "fa96b57c149061f71a70bd6582d995f6424fbbf4", "lessThan": "0f6810e39898af2d2cabd9313e4dbc945fb5dfdd", "status": "affected", "versionType": "git" }, { "version": "fa96b57c149061f71a70bd6582d995f6424fbbf4", "lessThan": "4551b30525cf3d2f026b92401ffe241eb04dfebe", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/loongarch/include/asm/acpi.h", "arch/loongarch/kernel/acpi.c" ], "versions": [ { "version": "5.19", "status": "affected" }, { "version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.19", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.7", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "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": "5.19", "versionEndExcluding": "6.6.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.7.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/88e189bd16e5889e44a41b3309558ebab78b9280" }, { "url": "https://git.kernel.org/stable/c/0f6810e39898af2d2cabd9313e4dbc945fb5dfdd" }, { "url": "https://git.kernel.org/stable/c/4551b30525cf3d2f026b92401ffe241eb04dfebe" } ], "title": "LoongArch: Change acpi_core_pic[NR_CPUS] to acpi_core_pic[MAX_CORE_PIC]", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-120", "lang": "en", "description": "CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "CHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2024-04-03T19:30:26.181836Z", "id": "CVE-2024-26768", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-11-07T19:36:27.034Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:14:13.501Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/88e189bd16e5889e44a41b3309558ebab78b9280", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/0f6810e39898af2d2cabd9313e4dbc945fb5dfdd", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/4551b30525cf3d2f026b92401ffe241eb04dfebe", "tags": [ "x_transferred" ] } ] } ] } }