CVE-2025-68219 (GCVE-0-2025-68219)

Vulnerability from cvelistv5 – Published: 2025-12-16 13:57 – Updated: 2025-12-16 13:57
VLAI?
Title
cifs: fix memory leak in smb3_fs_context_parse_param error path
Summary
In the Linux kernel, the following vulnerability has been resolved: cifs: fix memory leak in smb3_fs_context_parse_param error path Add proper cleanup of ctx->source and fc->source to the cifs_parse_mount_err error handler. This ensures that memory allocated for the source strings is correctly freed on all error paths, matching the cleanup already performed in the success path by smb3_cleanup_fs_context_contents(). Pointers are also set to NULL after freeing to prevent potential double-free issues. This change fixes a memory leak originally detected by syzbot. The leak occurred when processing Opt_source mount options if an error happened after ctx->source and fc->source were successfully allocated but before the function completed. The specific leak sequence was: 1. ctx->source = smb3_fs_context_fullpath(ctx, '/') allocates memory 2. fc->source = kstrdup(ctx->source, GFP_KERNEL) allocates more memory 3. A subsequent error jumps to cifs_parse_mount_err 4. The old error handler freed passwords but not the source strings, causing the memory to leak. This issue was not addressed by commit e8c73eb7db0a ("cifs: client: fix memory leak in smb3_fs_context_parse_param"), which only fixed leaks from repeated fsconfig() calls but not this error path. Patch updated with minor change suggested by kernel test robot
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f , < 7627864dc3121f39e220f5253a227edf472de59e (git)
Affected: 24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f , < 48d69290270891f988e72edddd9688c20515421d (git)
Affected: 24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f , < 37010021d7e0341bb241ca00bcbae31f2c50b23f (git)
Affected: 24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f , < 7e4d9120cfa413dd34f4f434befc5dbe6c38b2e5 (git)
Create a notification for this product.
    Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 6.6.118 , ≤ 6.6.* (semver)
Unaffected: 6.12.60 , ≤ 6.12.* (semver)
Unaffected: 6.17.10 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/fs_context.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7627864dc3121f39e220f5253a227edf472de59e",
              "status": "affected",
              "version": "24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f",
              "versionType": "git"
            },
            {
              "lessThan": "48d69290270891f988e72edddd9688c20515421d",
              "status": "affected",
              "version": "24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f",
              "versionType": "git"
            },
            {
              "lessThan": "37010021d7e0341bb241ca00bcbae31f2c50b23f",
              "status": "affected",
              "version": "24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f",
              "versionType": "git"
            },
            {
              "lessThan": "7e4d9120cfa413dd34f4f434befc5dbe6c38b2e5",
              "status": "affected",
              "version": "24e0a1eff9e2b9835a6e7c17039dfb6ecfd81f1f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/fs_context.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.11"
            },
            {
              "lessThan": "5.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.118",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.60",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.118",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.60",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.10",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "5.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: fix memory leak in smb3_fs_context_parse_param error path\n\nAdd proper cleanup of ctx-\u003esource and fc-\u003esource to the\ncifs_parse_mount_err error handler. This ensures that memory allocated\nfor the source strings is correctly freed on all error paths, matching\nthe cleanup already performed in the success path by\nsmb3_cleanup_fs_context_contents().\nPointers are also set to NULL after freeing to prevent potential\ndouble-free issues.\n\nThis change fixes a memory leak originally detected by syzbot. The\nleak occurred when processing Opt_source mount options if an error\nhappened after ctx-\u003esource and fc-\u003esource were successfully\nallocated but before the function completed.\n\nThe specific leak sequence was:\n1. ctx-\u003esource = smb3_fs_context_fullpath(ctx, \u0027/\u0027) allocates memory\n2. fc-\u003esource = kstrdup(ctx-\u003esource, GFP_KERNEL) allocates more memory\n3. A subsequent error jumps to cifs_parse_mount_err\n4. The old error handler freed passwords but not the source strings,\ncausing the memory to leak.\n\nThis issue was not addressed by commit e8c73eb7db0a (\"cifs: client:\nfix memory leak in smb3_fs_context_parse_param\"), which only fixed\nleaks from repeated fsconfig() calls but not this error path.\n\nPatch updated with minor change suggested by kernel test robot"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-16T13:57:13.461Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7627864dc3121f39e220f5253a227edf472de59e"
        },
        {
          "url": "https://git.kernel.org/stable/c/48d69290270891f988e72edddd9688c20515421d"
        },
        {
          "url": "https://git.kernel.org/stable/c/37010021d7e0341bb241ca00bcbae31f2c50b23f"
        },
        {
          "url": "https://git.kernel.org/stable/c/7e4d9120cfa413dd34f4f434befc5dbe6c38b2e5"
        }
      ],
      "title": "cifs: fix memory leak in smb3_fs_context_parse_param error path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68219",
    "datePublished": "2025-12-16T13:57:13.461Z",
    "dateReserved": "2025-12-16T13:41:40.256Z",
    "dateUpdated": "2025-12-16T13:57:13.461Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68219\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-16T14:15:55.013\",\"lastModified\":\"2025-12-18T15:08:06.237\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncifs: fix memory leak in smb3_fs_context_parse_param error path\\n\\nAdd proper cleanup of ctx-\u003esource and fc-\u003esource to the\\ncifs_parse_mount_err error handler. This ensures that memory allocated\\nfor the source strings is correctly freed on all error paths, matching\\nthe cleanup already performed in the success path by\\nsmb3_cleanup_fs_context_contents().\\nPointers are also set to NULL after freeing to prevent potential\\ndouble-free issues.\\n\\nThis change fixes a memory leak originally detected by syzbot. The\\nleak occurred when processing Opt_source mount options if an error\\nhappened after ctx-\u003esource and fc-\u003esource were successfully\\nallocated but before the function completed.\\n\\nThe specific leak sequence was:\\n1. ctx-\u003esource = smb3_fs_context_fullpath(ctx, \u0027/\u0027) allocates memory\\n2. fc-\u003esource = kstrdup(ctx-\u003esource, GFP_KERNEL) allocates more memory\\n3. A subsequent error jumps to cifs_parse_mount_err\\n4. The old error handler freed passwords but not the source strings,\\ncausing the memory to leak.\\n\\nThis issue was not addressed by commit e8c73eb7db0a (\\\"cifs: client:\\nfix memory leak in smb3_fs_context_parse_param\\\"), which only fixed\\nleaks from repeated fsconfig() calls but not this error path.\\n\\nPatch updated with minor change suggested by kernel test robot\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/37010021d7e0341bb241ca00bcbae31f2c50b23f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/48d69290270891f988e72edddd9688c20515421d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7627864dc3121f39e220f5253a227edf472de59e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7e4d9120cfa413dd34f4f434befc5dbe6c38b2e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.