Vulnerability-Lookup

FKIE_CVE-2026-46183

Vulnerability from fkie_nvd - Published: 2026-05-28 10:16 - Updated: 2026-05-28 13:44

Severity

Summary

In the Linux kernel, the following vulnerability has been resolved: mm/damon/sysfs-schemes: protect path kfree() with damon_sysfs_lock damon_sysfs_quot_goal->path can be read and written by users, via DAMON sysfs 'path' file. It can also be indirectly read, for the parameters {on,off}line committing to DAMON. The reads for parameters committing are protected by damon_sysfs_lock to avoid the sysfs files being destroyed while any of the parameters are being read. But the user-driven direct reads and writes are not protected by any lock, while the write is deallocating the path-pointing buffer. As a result, the readers could read the already freed buffer (user-after-free). Note that the user-reads don't race when the same open file is used by the writer, due to kernfs's open file locking. Nonetheless, doing the reads and writes with separate open files would be common. Fix it by protecting both the user-direct reads and writes with damon_sysfs_lock.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a34ca3e33da4b924c66bcca3729bf68ec5936910
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cf3b71421ca00807328c6d9cd242f9de3b77a4bf

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/sysfs-schemes: protect path kfree() with damon_sysfs_lock\n\ndamon_sysfs_quot_goal-\u003epath can be read and written by users, via DAMON\nsysfs \u0027path\u0027 file.  It can also be indirectly read, for the parameters\n{on,off}line committing to DAMON.  The reads for parameters committing are\nprotected by damon_sysfs_lock to avoid the sysfs files being destroyed\nwhile any of the parameters are being read.  But the user-driven direct\nreads and writes are not protected by any lock, while the write is\ndeallocating the path-pointing buffer.  As a result, the readers could\nread the already freed buffer (user-after-free).  Note that the user-reads\ndon\u0027t race when the same open file is used by the writer, due to kernfs\u0027s\nopen file locking.  Nonetheless, doing the reads and writes with separate\nopen files would be common.  Fix it by protecting both the user-direct\nreads and writes with damon_sysfs_lock."
    }
  ],
  "id": "CVE-2026-46183",
  "lastModified": "2026-05-28T13:44:01.663",
  "metrics": {},
  "published": "2026-05-28T10:16:33.933",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a34ca3e33da4b924c66bcca3729bf68ec5936910"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cf3b71421ca00807328c6d9cd242f9de3b77a4bf"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}

CVE-2026-46183 (GCVE-0-2026-46183)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:36 – Updated: 2026-05-28 09:36

Title

mm/damon/sysfs-schemes: protect path kfree() with damon_sysfs_lock

Summary

Severity

No CVSS data available.

Assigner

Linux

References

2 references

URL	Tags
https://git.kernel.org/stable/c/a34ca3e33da4b924c…
https://git.kernel.org/stable/c/cf3b71421ca008073…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c41e253a411eb73a5ac651c14f40c2ea2f274ebd , < a34ca3e33da4b924c66bcca3729bf68ec5936910 (git) Affected: c41e253a411eb73a5ac651c14f40c2ea2f274ebd , < cf3b71421ca00807328c6d9cd242f9de3b77a4bf (git)
Linux	Linux	Affected: 6.19 Unaffected: 0 , < 6.19 (semver) Unaffected: 7.0.7 , ≤ 7.0.* (semver) Unaffected: 7.1-rc2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/damon/sysfs-schemes.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a34ca3e33da4b924c66bcca3729bf68ec5936910",
              "status": "affected",
              "version": "c41e253a411eb73a5ac651c14f40c2ea2f274ebd",
              "versionType": "git"
            },
            {
              "lessThan": "cf3b71421ca00807328c6d9cd242f9de3b77a4bf",
              "status": "affected",
              "version": "c41e253a411eb73a5ac651c14f40c2ea2f274ebd",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/damon/sysfs-schemes.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "lessThan": "6.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.7",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1-rc2",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/sysfs-schemes: protect path kfree() with damon_sysfs_lock\n\ndamon_sysfs_quot_goal-\u003epath can be read and written by users, via DAMON\nsysfs \u0027path\u0027 file.  It can also be indirectly read, for the parameters\n{on,off}line committing to DAMON.  The reads for parameters committing are\nprotected by damon_sysfs_lock to avoid the sysfs files being destroyed\nwhile any of the parameters are being read.  But the user-driven direct\nreads and writes are not protected by any lock, while the write is\ndeallocating the path-pointing buffer.  As a result, the readers could\nread the already freed buffer (user-after-free).  Note that the user-reads\ndon\u0027t race when the same open file is used by the writer, due to kernfs\u0027s\nopen file locking.  Nonetheless, doing the reads and writes with separate\nopen files would be common.  Fix it by protecting both the user-direct\nreads and writes with damon_sysfs_lock."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-28T09:36:36.582Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a34ca3e33da4b924c66bcca3729bf68ec5936910"
        },
        {
          "url": "https://git.kernel.org/stable/c/cf3b71421ca00807328c6d9cd242f9de3b77a4bf"
        }
      ],
      "title": "mm/damon/sysfs-schemes: protect path kfree() with damon_sysfs_lock",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46183",
    "datePublished": "2026-05-28T09:36:36.582Z",
    "dateReserved": "2026-05-13T15:03:33.103Z",
    "dateUpdated": "2026-05-28T09:36:36.582Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

FKIE_CVE-2026-46183

CVE-2026-46183 (GCVE-0-2026-46183)

Tags

Sightings

Nomenclature