CVE-2025-40268 (GCVE-0-2025-40268)

Vulnerability from cvelistv5 – Published: 2025-12-06 21:50 – Updated: 2025-12-06 21:50
VLAI?
Title
cifs: client: fix memory leak in smb3_fs_context_parse_param
Summary
In the Linux kernel, the following vulnerability has been resolved: cifs: client: fix memory leak in smb3_fs_context_parse_param The user calls fsconfig twice, but when the program exits, free() only frees ctx->source for the second fsconfig, not the first. Regarding fc->source, there is no code in the fs context related to its memory reclamation. To fix this memory leak, release the source memory corresponding to ctx or fc before each parsing. syzbot reported: BUG: memory leak unreferenced object 0xffff888128afa360 (size 96): backtrace (crc 79c9c7ba): kstrdup+0x3c/0x80 mm/util.c:84 smb3_fs_context_parse_param+0x229b/0x36c0 fs/smb/client/fs_context.c:1444 BUG: memory leak unreferenced object 0xffff888112c7d900 (size 96): backtrace (crc 79c9c7ba): smb3_fs_context_fullpath+0x70/0x1b0 fs/smb/client/fs_context.c:629 smb3_fs_context_parse_param+0x2266/0x36c0 fs/smb/client/fs_context.c:1438
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 868fc62811d3fabcf5685e14f36377a855d5412d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 48c17341577e25a22feb13d694374b61d974edbc (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4515743cc7a42e1d67468402a6420c195532a6fa (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e8c73eb7db0a498cd4b22d2819e6ab1a6f506bd6 (git)
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    Linux Linux Unaffected: 6.6.117 , ≤ 6.6.* (semver)
Unaffected: 6.12.59 , ≤ 6.12.* (semver)
Unaffected: 6.17.9 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "fs/smb/client/fs_context.c"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: client: fix memory leak in smb3_fs_context_parse_param\n\nThe user calls fsconfig twice, but when the program exits, free() only\nfrees ctx-\u003esource for the second fsconfig, not the first.\nRegarding fc-\u003esource, there is no code in the fs context related to its\nmemory reclamation.\n\nTo fix this memory leak, release the source memory corresponding to ctx\nor fc before each parsing.\n\nsyzbot reported:\nBUG: memory leak\nunreferenced object 0xffff888128afa360 (size 96):\n  backtrace (crc 79c9c7ba):\n    kstrdup+0x3c/0x80 mm/util.c:84\n    smb3_fs_context_parse_param+0x229b/0x36c0 fs/smb/client/fs_context.c:1444\n\nBUG: memory leak\nunreferenced object 0xffff888112c7d900 (size 96):\n  backtrace (crc 79c9c7ba):\n    smb3_fs_context_fullpath+0x70/0x1b0 fs/smb/client/fs_context.c:629\n    smb3_fs_context_parse_param+0x2266/0x36c0 fs/smb/client/fs_context.c:1438"
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      "providerMetadata": {
        "dateUpdated": "2025-12-06T21:50:48.917Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/868fc62811d3fabcf5685e14f36377a855d5412d"
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        {
          "url": "https://git.kernel.org/stable/c/e8c73eb7db0a498cd4b22d2819e6ab1a6f506bd6"
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      ],
      "title": "cifs: client: fix memory leak in smb3_fs_context_parse_param",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40268",
    "datePublished": "2025-12-06T21:50:48.917Z",
    "dateReserved": "2025-04-16T07:20:57.183Z",
    "dateUpdated": "2025-12-06T21:50:48.917Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40268\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-06T22:15:54.327\",\"lastModified\":\"2025-12-08T18:26:49.133\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncifs: client: fix memory leak in smb3_fs_context_parse_param\\n\\nThe user calls fsconfig twice, but when the program exits, free() only\\nfrees ctx-\u003esource for the second fsconfig, not the first.\\nRegarding fc-\u003esource, there is no code in the fs context related to its\\nmemory reclamation.\\n\\nTo fix this memory leak, release the source memory corresponding to ctx\\nor fc before each parsing.\\n\\nsyzbot reported:\\nBUG: memory leak\\nunreferenced object 0xffff888128afa360 (size 96):\\n  backtrace (crc 79c9c7ba):\\n    kstrdup+0x3c/0x80 mm/util.c:84\\n    smb3_fs_context_parse_param+0x229b/0x36c0 fs/smb/client/fs_context.c:1444\\n\\nBUG: memory leak\\nunreferenced object 0xffff888112c7d900 (size 96):\\n  backtrace (crc 79c9c7ba):\\n    smb3_fs_context_fullpath+0x70/0x1b0 fs/smb/client/fs_context.c:629\\n    smb3_fs_context_parse_param+0x2266/0x36c0 fs/smb/client/fs_context.c:1438\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4515743cc7a42e1d67468402a6420c195532a6fa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/48c17341577e25a22feb13d694374b61d974edbc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/868fc62811d3fabcf5685e14f36377a855d5412d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e8c73eb7db0a498cd4b22d2819e6ab1a6f506bd6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • 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.



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