CVE-2026-81008

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: interconnect: Fix use after free in icc_get() and of_icc_get_by_index() In of_icc_get_by_index() and icc_get(), if the dynamic allocation for path->name fails via kasprintf(), the error handling path directly calls kfree(path) to free the path object and returns an error. However, prior to this point, path_find() calls path_init(), which already links the path's requests into the req_list of the respective interconnect nodes via hlist_add_head(). Directly invoking kfree(path) leaves dangling pointers in the hlist. A subsequent call to icc_get() or icc_set_bw() will traverse or modify these corrupted lists, triggering a slab use afterfree. KASAN report showing the vulnerability when reproducing via debugfs: BUG: KASAN: slab-use-after-free in path_find+0x6f8/0xcfc Write of size 8 at addr fff000000d43f748 by task sh/1 ... Call trace: kasan_report+0xac/0xfc path_find+0x6f8/0xcfc icc_get+0x148/0x380 icc_get_set+0xf8/0x2d0 ... Freed by task 1: kfree+0x1a0/0x4a4 icc_get+0x2cc/0x380 icc_get_set+0xf8/0x2d0 Fix this by replacing kfree(path) with the proper teardown function, icc_put(path), which safely removes the requests from the req_list using hlist_del() and drops the provider usage references before freeing the memory. Additionally, in icc_get(), ensure that the icc_lock mutex is released prior to calling icc_put(path) to avoid a deadlock, as icc_put() internally acquires the same lock.

Severity

HIGH

CVSS score

7.8 (v3.1)

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-11 20:19:09.560000

Last modified

2026-10-19 09:17:34.160000

View original CVE JSON

{
  "id": "CVE-2026-81008",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-11T20:19:09.560",
  "lastModified": "2026-10-19T09:17:34.160",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ninterconnect: Fix use after free in icc_get() and of_icc_get_by_index()\n\nIn of_icc_get_by_index() and icc_get(), if the dynamic allocation for\npath->name fails via kasprintf(), the error handling path directly\ncalls kfree(path) to free the path object and returns an error.\n\nHowever, prior to this point, path_find() calls path_init(), which\nalready links the path's requests into the req_list of the respective\ninterconnect nodes via hlist_add_head(). Directly invoking kfree(path)\nleaves dangling pointers in the hlist. A subsequent call to icc_get()\nor icc_set_bw() will traverse or modify these corrupted lists, triggering\na slab use afterfree.\n\nKASAN report showing the vulnerability when reproducing via debugfs:\n\n  BUG: KASAN: slab-use-after-free in path_find+0x6f8/0xcfc\n  Write of size 8 at addr fff000000d43f748 by task sh/1\n  ...\n  Call trace:\n   kasan_report+0xac/0xfc\n   path_find+0x6f8/0xcfc\n   icc_get+0x148/0x380\n   icc_get_set+0xf8/0x2d0\n  ...\n  Freed by task 1:\n   kfree+0x1a0/0x4a4\n   icc_get+0x2cc/0x380\n   icc_get_set+0xf8/0x2d0\n\nFix this by replacing kfree(path) with the proper teardown function,\nicc_put(path), which safely removes the requests from the req_list using\nhlist_del() and drops the provider usage references before freeing the\nmemory.\n\nAdditionally, in icc_get(), ensure that the icc_lock mutex is released\nprior to calling icc_put(path) to avoid a deadlock, as icc_put()\ninternally acquires the same lock."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/interconnect/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
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              "versionType": "git",
              "status": "affected"
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              "status": "affected"
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              "versionType": "git",
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              "versionType": "git",
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        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
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              "version": "5.6",
              "status": "affected"
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            {
              "version": "0",
              "lessThan": "5.6",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.270",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.221",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.188",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.157",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.109",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.50",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.4",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "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:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/03c3af594dea9196cf6ca70d914b42aa8c873c35",
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}