{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2022-49214",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-49214",
    "idYear": 2022,
    "status": "PUBLISHED",
    "publishedAt": "2025-02-26T01:55:49.677Z",
    "updatedAt": "2026-05-11T18:55:21.234Z",
    "importedAt": "2026-10-24T01:56:49.724Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "powerpc/64s: Don't use DSISR for SLB faults",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/64s: Don't use DSISR for SLB faults\n\nSince commit 46ddcb3950a2 (\"powerpc/mm: Show if a bad page fault on data\nis read or write.\") we use page_fault_is_write(regs->dsisr) in\n__bad_page_fault() to determine if the fault is for a read or write, and\nchange the message printed accordingly.\n\nBut SLB faults, aka Data Segment Interrupts, don't set DSISR (Data\nStorage Interrupt Status Register) to a useful value. All ISA versions\nfrom v2.03 through v3.1 specify that the Data Segment Interrupt sets\nDSISR \"to an undefined value\". As far as I can see there's no mention of\nSLB faults setting DSISR in any BookIV content either.\n\nThis manifests as accesses that should be a read being incorrectly\nreported as writes, for example, using the xmon \"dump\" command:\n\n  0:mon> d 0x5deadbeef0000000\n  5deadbeef0000000\n  [359526.415354][    C6] BUG: Unable to handle kernel data access on write at 0x5deadbeef0000000\n  [359526.415611][    C6] Faulting instruction address: 0xc00000000010a300\n  cpu 0x6: Vector: 380 (Data SLB Access) at [c00000000ffbf400]\n      pc: c00000000010a300: mread+0x90/0x190\n\nIf we disassemble the PC, we see a load instruction:\n\n  0:mon> di c00000000010a300\n  c00000000010a300 89490000      lbz     r10,0(r9)\n\nWe can also see in exceptions-64s.S that the data_access_slb block\ndoesn't set IDSISR=1, which means it doesn't load DSISR into pt_regs. So\nthe value we're using to determine if the fault is a read/write is some\nstale value in pt_regs from a previous page fault.\n\nRework the printing logic to separate the SLB fault case out, and only\nprint read/write in the cases where we can determine it.\n\nThe result looks like eg:\n\n  0:mon> d 0x5deadbeef0000000\n  5deadbeef0000000\n  [  721.779525][    C6] BUG: Unable to handle kernel data access at 0x5deadbeef0000000\n  [  721.779697][    C6] Faulting instruction address: 0xc00000000014cbe0\n  cpu 0x6: Vector: 380 (Data SLB Access) at [c00000000ffbf390]\n\n  0:mon> d 0\n  0000000000000000\n  [  742.793242][    C6] BUG: Kernel NULL pointer dereference at 0x00000000\n  [  742.793316][    C6] Faulting instruction address: 0xc00000000014cbe0\n  cpu 0x6: Vector: 380 (Data SLB Access) at [c00000000ffbf390]",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "46ddcb3950a28c0df4815e8dbb8d4b91d5d9f22d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4a852ff9b7bea9c640540e2c1bc70bd3ba455d61"
            },
            {
              "version": "46ddcb3950a28c0df4815e8dbb8d4b91d5d9f22d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a3dae36d632b2cf6eb20314273e512a96cb43c9a"
            },
            {
              "version": "46ddcb3950a28c0df4815e8dbb8d4b91d5d9f22d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "093449bb182db885dae816d62874cccab7a4c42a"
            },
            {
              "version": "46ddcb3950a28c0df4815e8dbb8d4b91d5d9f22d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d4679ac8ea2e5078704aa1c026db36580cc1bf9a"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.5",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.5"
            },
            {
              "version": "5.15.33",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "5.16.19",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.16.*"
            },
            {
              "version": "5.17.2",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.17.*"
            },
            {
              "version": "5.18",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}