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CVE-2026-46250 (GCVE-0-2026-46250)

Vulnerability from cvelistv5 – Published: 2026-06-03 15:49 – Updated: 2026-08-05 12:30
VLAI
Title
MIPS: Work around LLVM bug when gp is used as global register variable
Summary
In the Linux kernel, the following vulnerability has been resolved: MIPS: Work around LLVM bug when gp is used as global register variable On MIPS, __current_thread_info is defined as global register variable locating in $gp, and is simply assigned with new address during kernel relocation. This however is broken with LLVM, which always restores $gp if it finds $gp is clobbered in any form, including when intentionally through a global register variable. This is against GCC's documentation[1], which requires a callee-saved register used as global register variable not to be restored if it's clobbered. As a result, $gp will continue to point to the unrelocated kernel after the epilog of relocate_kernel(), leading to an early crash in init_idle, [ 0.000000] CPU 0 Unable to handle kernel paging request at virtual address 0000000000000000, epc == ffffffff81afada8, ra == ffffffff81afad90 [ 0.000000] Oops[#1]: [ 0.000000] CPU: 0 UID: 0 PID: 0 Comm: swapper Tainted: G W 6.19.0-rc5-00262-gd3eeb99bbc99-dirty #188 VOLUNTARY [ 0.000000] Tainted: [W]=WARN [ 0.000000] Hardware name: loongson,loongson64v-4core-virtio [ 0.000000] $ 0 : 0000000000000000 0000000000000000 0000000000000001 0000000000000000 [ 0.000000] $ 4 : ffffffff80b80ec0 ffffffff80b53d48 0000000000000000 00000000000f4240 [ 0.000000] $ 8 : 0000000000000100 ffffffff81d82f80 ffffffff81d82f80 0000000000000001 [ 0.000000] $12 : 0000000000000000 ffffffff81776f58 00000000000005da 0000000000000002 [ 0.000000] $16 : ffffffff80b80e40 0000000000000000 ffffffff80b81614 9800000005dfbe80 [ 0.000000] $20 : 00000000540000e0 ffffffff81980000 0000000000000000 ffffffff80f81c80 [ 0.000000] $24 : 0000000000000a26 ffffffff8114fb90 [ 0.000000] $28 : ffffffff80b50000 ffffffff80b53d40 0000000000000000 ffffffff81afad90 [ 0.000000] Hi : 0000000000000000 [ 0.000000] Lo : 0000000000000000 [ 0.000000] epc : ffffffff81afada8 init_idle+0x130/0x270 [ 0.000000] ra : ffffffff81afad90 init_idle+0x118/0x270 [ 0.000000] Status: 540000e2 KX SX UX KERNEL EXL [ 0.000000] Cause : 00000008 (ExcCode 02) [ 0.000000] BadVA : 0000000000000000 [ 0.000000] PrId : 00006305 (ICT Loongson-3) [ 0.000000] Process swapper (pid: 0, threadinfo=(____ptrval____), task=(____ptrval____), tls=0000000000000000) [ 0.000000] Stack : 9800000005dfbf00 ffffffff8178e950 0000000000000000 0000000000000000 [ 0.000000] 0000000000000000 ffffffff81970000 000000000000003f ffffffff810a6528 [ 0.000000] 0000000000000001 9800000005dfbe80 9800000005dfbf00 ffffffff81980000 [ 0.000000] ffffffff810a6450 ffffffff81afb6c0 0000000000000000 ffffffff810a2258 [ 0.000000] ffffffff81d82ec8 ffffffff8198d010 ffffffff81b67e80 ffffffff8197dd98 [ 0.000000] ffffffff81d81c80 ffffffff81930000 0000000000000040 0000000000000000 [ 0.000000] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 0.000000] 0000000000000000 000000000000009e ffffffff9fc01000 0000000000000000 [ 0.000000] 0000000000000000 0000000000000000 0000000000000000 0000000000000000 [ 0.000000] 0000000000000000 ffffffff81ae86dc ffffffff81b3c741 0000000000000002 [ 0.000000] ... [ 0.000000] Call Trace: [ 0.000000] [<ffffffff81afada8>] init_idle+0x130/0x270 [ 0.000000] [<ffffffff81afb6c0>] sched_init+0x5c8/0x6c0 [ 0.000000] [<ffffffff81ae86dc>] start_kernel+0x27c/0x7a8 This bug has been reported to LLVM[2] and affects version from (at least) 18 to 21. Let's work around this by using inline assembly to assign $gp before a fix is widely available.
Severity
7.3 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 279b991b24d2439fbe9d2f093988b9c8aed2603d , < 05bff9b0ae095b2420cfebb4a96759a09334bec6 (git)
Affected: 279b991b24d2439fbe9d2f093988b9c8aed2603d , < 1fe3b402b1e97a1718df3be0a1d3eee20133e735 (git)
Affected: 279b991b24d2439fbe9d2f093988b9c8aed2603d , < 4dc65b40fb80c2020efbf139b9a38d30f9a37b92 (git)
Affected: 279b991b24d2439fbe9d2f093988b9c8aed2603d , < c0155dee51b9f5f48aaf5c71cae005eb0e36521f (git)
Affected: 279b991b24d2439fbe9d2f093988b9c8aed2603d , < e3a6498a63394218561065a9a7a597a204f52f6a (git)
Affected: 279b991b24d2439fbe9d2f093988b9c8aed2603d , < 561834f6d6f52b8a1791331e94b2aac753491d2a (git)
Affected: 279b991b24d2439fbe9d2f093988b9c8aed2603d , < 9bc3b0ae5203aba650297fdf3e1e774125e423f2 (git)
Affected: 279b991b24d2439fbe9d2f093988b9c8aed2603d , < 30bfc2d6a1132a89a5f1c3b96c59cf3e4d076ea3 (git)
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Linux Linux Affected: 4.7
Unaffected: 0 , < 4.7 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/mips/kernel/relocate.c"
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          "defaultStatus": "affected",
          "product": "Linux",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.7"
            },
            {
              "lessThan": "4.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.252",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.202",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.165",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.128",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.252",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.202",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.165",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.128",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.75",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.14",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.4",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nMIPS: Work around LLVM bug when gp is used as global register variable\n\nOn MIPS, __current_thread_info is defined as global register variable\nlocating in $gp, and is simply assigned with new address during kernel\nrelocation.\n\nThis however is broken with LLVM, which always restores $gp if it finds\n$gp is clobbered in any form, including when intentionally through a\nglobal register variable. This is against GCC\u0027s documentation[1], which\nrequires a callee-saved register used as global register variable not to\nbe restored if it\u0027s clobbered.\n\nAs a result, $gp will continue to point to the unrelocated kernel after\nthe epilog of relocate_kernel(), leading to an early crash in init_idle,\n\n[    0.000000] CPU 0 Unable to handle kernel paging request at virtual address 0000000000000000, epc == ffffffff81afada8, ra == ffffffff81afad90\n[    0.000000] Oops[#1]:\n[    0.000000] CPU: 0 UID: 0 PID: 0 Comm: swapper Tainted: G        W           6.19.0-rc5-00262-gd3eeb99bbc99-dirty #188 VOLUNTARY\n[    0.000000] Tainted: [W]=WARN\n[    0.000000] Hardware name: loongson,loongson64v-4core-virtio\n[    0.000000] $ 0   : 0000000000000000 0000000000000000 0000000000000001 0000000000000000\n[    0.000000] $ 4   : ffffffff80b80ec0 ffffffff80b53d48 0000000000000000 00000000000f4240\n[    0.000000] $ 8   : 0000000000000100 ffffffff81d82f80 ffffffff81d82f80 0000000000000001\n[    0.000000] $12   : 0000000000000000 ffffffff81776f58 00000000000005da 0000000000000002\n[    0.000000] $16   : ffffffff80b80e40 0000000000000000 ffffffff80b81614 9800000005dfbe80\n[    0.000000] $20   : 00000000540000e0 ffffffff81980000 0000000000000000 ffffffff80f81c80\n[    0.000000] $24   : 0000000000000a26 ffffffff8114fb90\n[    0.000000] $28   : ffffffff80b50000 ffffffff80b53d40 0000000000000000 ffffffff81afad90\n[    0.000000] Hi    : 0000000000000000\n[    0.000000] Lo    : 0000000000000000\n[    0.000000] epc   : ffffffff81afada8 init_idle+0x130/0x270\n[    0.000000] ra    : ffffffff81afad90 init_idle+0x118/0x270\n[    0.000000] Status: 540000e2\tKX SX UX KERNEL EXL\n[    0.000000] Cause : 00000008 (ExcCode 02)\n[    0.000000] BadVA : 0000000000000000\n[    0.000000] PrId  : 00006305 (ICT Loongson-3)\n[    0.000000] Process swapper (pid: 0, threadinfo=(____ptrval____), task=(____ptrval____), tls=0000000000000000)\n[    0.000000] Stack : 9800000005dfbf00 ffffffff8178e950 0000000000000000 0000000000000000\n[    0.000000]         0000000000000000 ffffffff81970000 000000000000003f ffffffff810a6528\n[    0.000000]         0000000000000001 9800000005dfbe80 9800000005dfbf00 ffffffff81980000\n[    0.000000]         ffffffff810a6450 ffffffff81afb6c0 0000000000000000 ffffffff810a2258\n[    0.000000]         ffffffff81d82ec8 ffffffff8198d010 ffffffff81b67e80 ffffffff8197dd98\n[    0.000000]         ffffffff81d81c80 ffffffff81930000 0000000000000040 0000000000000000\n[    0.000000]         0000000000000000 0000000000000000 0000000000000000 0000000000000000\n[    0.000000]         0000000000000000 000000000000009e ffffffff9fc01000 0000000000000000\n[    0.000000]         0000000000000000 0000000000000000 0000000000000000 0000000000000000\n[    0.000000]         0000000000000000 ffffffff81ae86dc ffffffff81b3c741 0000000000000002\n[    0.000000]         ...\n[    0.000000] Call Trace:\n[    0.000000] [\u003cffffffff81afada8\u003e] init_idle+0x130/0x270\n[    0.000000] [\u003cffffffff81afb6c0\u003e] sched_init+0x5c8/0x6c0\n[    0.000000] [\u003cffffffff81ae86dc\u003e] start_kernel+0x27c/0x7a8\n\nThis bug has been reported to LLVM[2] and affects version from (at\nleast) 18 to 21. Let\u0027s work around this by using inline assembly to\nassign $gp before a fix is widely available."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code runs only during early boot in `relocate_kernel()` (`arch/mips/kernel/head.S` \u2192 `arch/mips/kernel/relocate.c`), before any network stack or syscall interface exists; the only way to reach it is to boot or reboot the MIPS system locally.\nAC:L - When the kernel is built with LLVM/Clang, `CONFIG_RELOCATABLE`, and KASLR relocation (`offset != 0`), LLVM deterministically restores `$gp` in the `relocate_kernel()` epilog, causing a reliable crash in `init_idle()` on every affected boot without races or attacker-uncontrollable timing.\nPR:N - Execution occurs in the pre-authentication boot path (PID 0 swapper during `start_kernel()` \u2192 `sched_init()` \u2192 `init_idle()`), before any user login or privilege checks; no attacker credentials are required at the time the bug triggers.\nUI:N - No victim user action is required beyond normal system power-on or reboot; the fault occurs automatically during kernel initialization on affected builds.\nS:U - Impact is confined to kernel boot failure on the same machine; there is no crossing of security boundaries such as VM escape, sandbox escape, or IOMMU bypass.\nC:L - The stale `$gp`/`__current_thread_info` causes `current` to resolve from the unrelocated `init_thread_union`, leading to dereferences of invalid kernel memory and limited kernel-address information exposure in the oops before the paging fault at address 0.\nI:L - Before the fatal fault, `init_idle()` performs writes through the mis-resolved `current` pointer (e.g., task state and scheduler fields), enabling limited unintended modification of kernel structures even though the immediate outcome is a crash rather than controlled code execution.\nA:H - The bug produces a kernel oops during early boot in `init_idle()` with \"Unable to handle kernel paging request at virtual address 0000000000000000\", preventing the system from completing initialization and rendering it unavailable."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:30:44.867Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/05bff9b0ae095b2420cfebb4a96759a09334bec6"
        },
        {
          "url": "https://git.kernel.org/stable/c/1fe3b402b1e97a1718df3be0a1d3eee20133e735"
        },
        {
          "url": "https://git.kernel.org/stable/c/4dc65b40fb80c2020efbf139b9a38d30f9a37b92"
        },
        {
          "url": "https://git.kernel.org/stable/c/c0155dee51b9f5f48aaf5c71cae005eb0e36521f"
        },
        {
          "url": "https://git.kernel.org/stable/c/e3a6498a63394218561065a9a7a597a204f52f6a"
        },
        {
          "url": "https://git.kernel.org/stable/c/561834f6d6f52b8a1791331e94b2aac753491d2a"
        },
        {
          "url": "https://git.kernel.org/stable/c/9bc3b0ae5203aba650297fdf3e1e774125e423f2"
        },
        {
          "url": "https://git.kernel.org/stable/c/30bfc2d6a1132a89a5f1c3b96c59cf3e4d076ea3"
        }
      ],
      "title": "MIPS: Work around LLVM bug when gp is used as global register variable",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46250",
    "datePublished": "2026-06-03T15:49:46.390Z",
    "dateReserved": "2026-05-13T15:03:33.107Z",
    "dateUpdated": "2026-08-05T12:30:44.867Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-46250",
      "date": "2026-09-16",
      "epss": "0.00128",
      "percentile": "0.02827"
    },
    "microsoft_vex": {
      "current_release_date": "2026-06-09T01:44:59.000Z",
      "cve": "CVE-2026-46250",
      "id": "msrc_CVE-2026-46250",
      "initial_release_date": "2026-06-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "MIPS: Work around LLVM bug when gp is used as global register variable",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46250.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-46250\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-03T18:16:25.400\",\"lastModified\":\"2026-07-22T20:10:00.127\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nMIPS: Work around LLVM bug when gp is used as global register variable\\n\\nOn MIPS, __current_thread_info is defined as global register variable\\nlocating in $gp, and is simply assigned with new address during kernel\\nrelocation.\\n\\nThis however is broken with LLVM, which always restores $gp if it finds\\n$gp is clobbered in any form, including when intentionally through a\\nglobal register variable. This is against GCC\u0027s documentation[1], which\\nrequires a callee-saved register used as global register variable not to\\nbe restored if it\u0027s clobbered.\\n\\nAs a result, $gp will continue to point to the unrelocated kernel after\\nthe epilog of relocate_kernel(), leading to an early crash in init_idle,\\n\\n[    0.000000] CPU 0 Unable to handle kernel paging request at virtual address 0000000000000000, epc == ffffffff81afada8, ra == ffffffff81afad90\\n[    0.000000] Oops[#1]:\\n[    0.000000] CPU: 0 UID: 0 PID: 0 Comm: swapper Tainted: G        W           6.19.0-rc5-00262-gd3eeb99bbc99-dirty #188 VOLUNTARY\\n[    0.000000] Tainted: [W]=WARN\\n[    0.000000] Hardware name: loongson,loongson64v-4core-virtio\\n[    0.000000] $ 0   : 0000000000000000 0000000000000000 0000000000000001 0000000000000000\\n[    0.000000] $ 4   : ffffffff80b80ec0 ffffffff80b53d48 0000000000000000 00000000000f4240\\n[    0.000000] $ 8   : 0000000000000100 ffffffff81d82f80 ffffffff81d82f80 0000000000000001\\n[    0.000000] $12   : 0000000000000000 ffffffff81776f58 00000000000005da 0000000000000002\\n[    0.000000] $16   : ffffffff80b80e40 0000000000000000 ffffffff80b81614 9800000005dfbe80\\n[    0.000000] $20   : 00000000540000e0 ffffffff81980000 0000000000000000 ffffffff80f81c80\\n[    0.000000] $24   : 0000000000000a26 ffffffff8114fb90\\n[    0.000000] $28   : ffffffff80b50000 ffffffff80b53d40 0000000000000000 ffffffff81afad90\\n[    0.000000] Hi    : 0000000000000000\\n[    0.000000] Lo    : 0000000000000000\\n[    0.000000] epc   : ffffffff81afada8 init_idle+0x130/0x270\\n[    0.000000] ra    : ffffffff81afad90 init_idle+0x118/0x270\\n[    0.000000] Status: 540000e2\\tKX SX UX KERNEL EXL\\n[    0.000000] Cause : 00000008 (ExcCode 02)\\n[    0.000000] BadVA : 0000000000000000\\n[    0.000000] PrId  : 00006305 (ICT Loongson-3)\\n[    0.000000] Process swapper (pid: 0, threadinfo=(____ptrval____), task=(____ptrval____), tls=0000000000000000)\\n[    0.000000] Stack : 9800000005dfbf00 ffffffff8178e950 0000000000000000 0000000000000000\\n[    0.000000]         0000000000000000 ffffffff81970000 000000000000003f ffffffff810a6528\\n[    0.000000]         0000000000000001 9800000005dfbe80 9800000005dfbf00 ffffffff81980000\\n[    0.000000]         ffffffff810a6450 ffffffff81afb6c0 0000000000000000 ffffffff810a2258\\n[    0.000000]         ffffffff81d82ec8 ffffffff8198d010 ffffffff81b67e80 ffffffff8197dd98\\n[    0.000000]         ffffffff81d81c80 ffffffff81930000 0000000000000040 0000000000000000\\n[    0.000000]         0000000000000000 0000000000000000 0000000000000000 0000000000000000\\n[    0.000000]         0000000000000000 000000000000009e ffffffff9fc01000 0000000000000000\\n[    0.000000]         0000000000000000 0000000000000000 0000000000000000 0000000000000000\\n[    0.000000]         0000000000000000 ffffffff81ae86dc ffffffff81b3c741 0000000000000002\\n[    0.000000]         ...\\n[    0.000000] Call Trace:\\n[    0.000000] [\u003cffffffff81afada8\u003e] init_idle+0x130/0x270\\n[    0.000000] [\u003cffffffff81afb6c0\u003e] sched_init+0x5c8/0x6c0\\n[    0.000000] [\u003cffffffff81ae86dc\u003e] start_kernel+0x27c/0x7a8\\n\\nThis bug has been reported to LLVM[2] and affects version from (at\\nleast) 18 to 21. Let\u0027s work around this by using inline assembly to\\nassign $gp before a fix is widely available.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\nMIPS: Soluci\u00f3n alternativa para el error de LLVM cuando gp se usa como variable de registro global\\n\\nEn MIPS, __current_thread_info se define como una variable de registro global ubicada en $gp, y simplemente se le asigna una nueva direcci\u00f3n durante la reubicaci\u00f3n del kernel.\\n\\nEsto, sin embargo, se rompe con LLVM, que siempre restaura $gp si encuentra que $gp ha sido sobrescrito de alguna forma, incluso cuando es intencionalmente a trav\u00e9s de una variable de registro global. Esto va en contra de la documentaci\u00f3n de GCC[1], que requiere que un registro guardado por la funci\u00f3n llamada, utilizado como variable de registro global, no sea restaurado si ha sido sobrescrito.\\n\\nComo resultado, $gp continuar\u00e1 apuntando al kernel no reubicado despu\u00e9s del ep\u00edlogo de relocate_kernel(), lo que lleva a un fallo temprano en init_idle,\\n\\n[    0.000000] CPU 0 No se puede manejar la solicitud de paginaci\u00f3n del kernel en la direcci\u00f3n virtual 0000000000000000, epc == ffffffff81afada8, ra == ffffffff81afad90\\n[    0.000000] Oops[#1]:\\n[    0.000000] CPU: 0 UID: 0 PID: 0 Comm: swapper Tainted: G        W           6.19.0-rc5-00262-gd3eeb99bbc99-dirty #188 VOLUNTARY\\n[    0.000000] Tainted: [W]=WARN\\n[    0.000000] Nombre del hardware: loongson,loongson64v-4core-virtio\\n[    0.000000] $ 0   : 0000000000000000 0000000000000000 0000000000000001 0000000000000000\\n[    0.000000] $ 4   : ffffffff80b80ec0 ffffffff80b53d48 0000000000000000 00000000000f4240\\n[    0.000000] $ 8   : 0000000000000100 ffffffff81d82f80 ffffffff81d82f80 0000000000000001\\n[    0.000000] $12   : 0000000000000000 ffffffff81776f58 00000000000005da 0000000000000002\\n[    0.000000] $16   : ffffffff80b80e40 0000000000000000 ffffffff80b81614 9800000005dfbe80\\n[    0.000000] $20   : 00000000540000e0 ffffffff81980000 0000000000000000 ffffffff80f81c80\\n[    0.000000] $24   : 0000000000000a26 ffffffff8114fb90\\n[    0.000000] $28   : ffffffff80b50000 ffffffff80b53d40 0000000000000000 ffffffff81afad90\\n[    0.000000] Hi    : 0000000000000000\\n[    0.000000] Lo    : 0000000000000000\\n[    0.000000] epc   : ffffffff81afada8 init_idle+0x130/0x270\\n[    0.000000] ra    : ffffffff81afad90 init_idle+0x118/0x270\\n[    0.000000] Status: 540000e2\\tKX SX UX KERNEL EXL\\n[    0.000000] Cause : 00000008 (ExcCode 02)\\n[    0.000000] BadVA : 0000000000000000\\n[    0.000000] PrId  : 00006305 (ICT Loongson-3)\\n[    0.000000] Proceso swapper (pid: 0, threadinfo=(____ptrval____), task=(____ptrval____), tls=0000000000000000)\\n[    0.000000] Pila : 9800000005dfbf00 ffffffff8178e950 0000000000000000 0000000000000000\\n[    0.000000]         0000000000000000 ffffffff81970000 000000000000003f ffffffff810a6528\\n[    0.000000]         0000000000000001 9800000005dfbe80 9800000005dfbf00 ffffffff81980000\\n[    0.000000]         ffffffff810a6450 ffffffff81afb6c0 0000000000000000 ffffffff810a2258\\n[    0.000000]         ffffffff81d82ec8 ffffffff8198d010 ffffffff81b67e80 ffffffff8197dd98\\n[    0.000000]         ffffffff81d81c80 ffffffff81930000 0000000000000040 0000000000000000\\n[    0.000000]         0000000000000000 0000000000000000 0000000000000000 0000000000000000\\n[    0.000000]         0000000000000000 000000000000009e ffffffff9fc01000 0000000000000000\\n[    0.000000]         0000000000000000 0000000000000000 0000000000000000 0000000000000000\\n[    0.000000]         0000000000000000 ffffffff81ae86dc ffffffff81b3c741 0000000000000002\\n[    0.000000]         ...\\n[    0.000000] Rastro de llamadas:\\n[    0.000000] [\u003cffffffff81afada8\u003e] init_idle+0x130/0x270\\n[    0.000000] [\u003cffffffff81afb6c0\u003e] sched_init+0x5c8/0x6c0\\n[    0.000000] [\u003cffffffff81ae86dc\u003e] start_kernel+0x27c/0x7a8\\n\\nEste error ha sido reportado a LLVM[2] y afecta a las versiones desde (al menos) la 18 hasta la 21. Evitemos esto usando ensamblador en l\u00ednea para asignar $gp antes de que una soluci\u00f3n est\u00e9 ampliamente disponible.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/mips/kernel/relocate.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"279b991b24d2439fbe9d2f093988b9c8aed2603d\",\"lessThan\":\"05bff9b0ae095b2420cfebb4a96759a09334bec6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"279b991b24d2439fbe9d2f093988b9c8aed2603d\",\"lessThan\":\"1fe3b402b1e97a1718df3be0a1d3eee20133e735\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"279b991b24d2439fbe9d2f093988b9c8aed2603d\",\"lessThan\":\"4dc65b40fb80c2020efbf139b9a38d30f9a37b92\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"279b991b24d2439fbe9d2f093988b9c8aed2603d\",\"lessThan\":\"c0155dee51b9f5f48aaf5c71cae005eb0e36521f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"279b991b24d2439fbe9d2f093988b9c8aed2603d\",\"lessThan\":\"e3a6498a63394218561065a9a7a597a204f52f6a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"279b991b24d2439fbe9d2f093988b9c8aed2603d\",\"lessThan\":\"561834f6d6f52b8a1791331e94b2aac753491d2a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"279b991b24d2439fbe9d2f093988b9c8aed2603d\",\"lessThan\":\"9bc3b0ae5203aba650297fdf3e1e774125e423f2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"279b991b24d2439fbe9d2f093988b9c8aed2603d\",\"lessThan\":\"30bfc2d6a1132a89a5f1c3b96c59cf3e4d076ea3\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/mips/kernel/relocate.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.252\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.202\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.165\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.128\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.75\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.14\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.4\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H\",\"baseScore\":7.3,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.5,\"impactScore\":4.7}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.7\",\"versionEndExcluding\":\"5.10.252\",\"matchCriteriaId\":\"4A3B5D01-BD96-4232-A26F-686A4EAC3A0C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.202\",\"matchCriteriaId\":\"4002FC2B-1456-4666-B240-0EBF590C4671\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.165\",\"matchCriteriaId\":\"797C7F46-D0BE-4FB8-A502-C5EF8E6B6654\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.128\",\"matchCriteriaId\":\"851E9353-6C09-4CC9-877E-E09DB164A3C2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.75\",\"matchCriteriaId\":\"BCE16369-98ED-41CF-8995-DFDC10B288D2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.14\",\"matchCriteriaId\":\"BF463CB7-1F58-4607-B847-77ED23E4B9B7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.4\",\"matchCriteriaId\":\"672A3E79-EC03-479D-8503-361DFBDC8092\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/05bff9b0ae095b2420cfebb4a96759a09334bec6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1fe3b402b1e97a1718df3be0a1d3eee20133e735\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/30bfc2d6a1132a89a5f1c3b96c59cf3e4d076ea3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4dc65b40fb80c2020efbf139b9a38d30f9a37b92\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/561834f6d6f52b8a1791331e94b2aac753491d2a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9bc3b0ae5203aba650297fdf3e1e774125e423f2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c0155dee51b9f5f48aaf5c71cae005eb0e36521f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e3a6498a63394218561065a9a7a597a204f52f6a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T07:41:46+00:00",
      "cve": "CVE-2026-46250",
      "id": "CVE-2026-46250",
      "initial_release_date": "2026-06-03T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: MIPS: Work around LLVM bug when gp is used as global register variable",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46250.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-06T01:17:20Z",
      "cve": "CVE-2026-46250",
      "id": "CVE-2026-46250",
      "initial_release_date": "2026-06-04T02:21:56Z",
      "product_status:known_not_affected": "293",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46250",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46250.json",
      "version": "6"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.