FKIE_CVE-2026-98655

Vulnerability from fkie_nvd - Published: 2026-10-18 16:17 - Updated: 2026-10-30 13:21
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: perf: Require kernel access for text poke events Perf events with exclude_kernel=1 can be opened without kernel perf access. However, exclude_kernel does not suppress text-poke sideband records. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL and contains a raw kernel instruction address. An unprivileged task can therefore open and mmap a task-local software event with text_poke=1. Both opening a count-only tracepoint event and configuring UDP GRO for ESP-in-UDP cause updates to inline static calls; the observer receives the relocated addresses of the modified instructions. For a known kernel image, any such address reveals the runtime kernel text base despite KASLR. Call perf_allow_kernel() whenever attr.text_poke is set, regardless of exclude_kernel. Events that neither monitor kernel execution nor request text-poke records retain their existing permissions.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0e26d44b7c64b045adebcf5d614140f811f09752
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/357e8a77a501d96c9517f01f4a211eed5e9c9184
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4d8fc6290d14aa9e4c3b620fe3e5dc8ba3bea7e3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/677d0b51ac1a0db55d768c4c6399210b3de0795b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8c38cb055f6a9651198780e4e4d5283de4039f79
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c30886396eb1c0e9fdc4296398dea0db0ab37610
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e506333d1b9f42f1e402acebf1283af3c44a3809
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/events/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4d8fc6290d14aa9e4c3b620fe3e5dc8ba3bea7e3",
              "status": "affected",
              "version": "e17d43b93e544f5016c0251d2074c15568d5d963",
              "versionType": "git"
            },
            {
              "lessThan": "c30886396eb1c0e9fdc4296398dea0db0ab37610",
              "status": "affected",
              "version": "e17d43b93e544f5016c0251d2074c15568d5d963",
              "versionType": "git"
            },
            {
              "lessThan": "0e26d44b7c64b045adebcf5d614140f811f09752",
              "status": "affected",
              "version": "e17d43b93e544f5016c0251d2074c15568d5d963",
              "versionType": "git"
            },
            {
              "lessThan": "8c38cb055f6a9651198780e4e4d5283de4039f79",
              "status": "affected",
              "version": "e17d43b93e544f5016c0251d2074c15568d5d963",
              "versionType": "git"
            },
            {
              "lessThan": "8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7",
              "status": "affected",
              "version": "e17d43b93e544f5016c0251d2074c15568d5d963",
              "versionType": "git"
            },
            {
              "lessThan": "e506333d1b9f42f1e402acebf1283af3c44a3809",
              "status": "affected",
              "version": "e17d43b93e544f5016c0251d2074c15568d5d963",
              "versionType": "git"
            },
            {
              "lessThan": "677d0b51ac1a0db55d768c4c6399210b3de0795b",
              "status": "affected",
              "version": "e17d43b93e544f5016c0251d2074c15568d5d963",
              "versionType": "git"
            },
            {
              "lessThan": "357e8a77a501d96c9517f01f4a211eed5e9c9184",
              "status": "affected",
              "version": "e17d43b93e544f5016c0251d2074c15568d5d963",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/events/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.9"
            },
            {
              "lessThan": "5.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.273",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.224",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.56",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "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\nperf: Require kernel access for text poke events\n\nPerf events with exclude_kernel=1 can be opened without kernel perf\naccess. However, exclude_kernel does not suppress text-poke sideband\nrecords. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL\nand contains a raw kernel instruction address.\n\nAn unprivileged task can therefore open and mmap a task-local software\nevent with text_poke=1. Both opening a count-only tracepoint event and\nconfiguring UDP GRO for ESP-in-UDP cause updates to inline static calls;\nthe observer receives the relocated addresses of the modified instructions.\nFor a known kernel image, any such address reveals the runtime kernel\ntext base despite KASLR.\n\nCall perf_allow_kernel() whenever attr.text_poke is set, regardless of\nexclude_kernel. Events that neither monitor kernel execution nor request\ntext-poke records retain their existing permissions."
    }
  ],
  "id": "CVE-2026-98655",
  "lastModified": "2026-10-30T13:21:16.220",
  "metrics": {},
  "published": "2026-10-18T16:17:18.797",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0e26d44b7c64b045adebcf5d614140f811f09752"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/357e8a77a501d96c9517f01f4a211eed5e9c9184"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4d8fc6290d14aa9e4c3b620fe3e5dc8ba3bea7e3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/677d0b51ac1a0db55d768c4c6399210b3de0795b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8c38cb055f6a9651198780e4e4d5283de4039f79"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c30886396eb1c0e9fdc4296398dea0db0ab37610"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e506333d1b9f42f1e402acebf1283af3c44a3809"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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