FKIE_CVE-2026-23297

Vulnerability from fkie_nvd - Published: 2026-03-25 11:16 - Updated: 2026-05-29 14:29
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: Fix cred ref leak in nfsd_nl_threads_set_doit(). syzbot reported memory leak of struct cred. [0] nfsd_nl_threads_set_doit() passes get_current_cred() to nfsd_svc(), but put_cred() is not called after that. The cred is finally passed down to _svc_xprt_create(), which calls get_cred() with the cred for struct svc_xprt. The ownership of the refcount by get_current_cred() is not transferred to anywhere and is just leaked. nfsd_svc() is also called from write_threads(), but it does not bump file->f_cred there. nfsd_nl_threads_set_doit() is called from sendmsg() and current->cred does not go away. Let's use current_cred() in nfsd_nl_threads_set_doit(). [0]: BUG: memory leak unreferenced object 0xffff888108b89480 (size 184): comm "syz-executor", pid 5994, jiffies 4294943386 hex dump (first 32 bytes): 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 369454a7): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4958 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_noprof+0x412/0x580 mm/slub.c:5270 prepare_creds+0x22/0x600 kernel/cred.c:185 copy_creds+0x44/0x290 kernel/cred.c:286 copy_process+0x7a7/0x2870 kernel/fork.c:2086 kernel_clone+0xac/0x6e0 kernel/fork.c:2651 __do_sys_clone+0x7f/0xb0 kernel/fork.c:2792 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1cb968a2013ffa8112d52ebe605009ea1c6a582cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/27c13c5bb0948e3b5c64e59f8a903231896fab9bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/41170716421c25cd20b39e83f0e0762e212b377bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a3f88e3e18b51a7f654189189c762ebcdeaa7e29Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 7.0
linux linux_kernel 7.0
To clipboard 

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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: Fix cred ref leak in nfsd_nl_threads_set_doit().\n\nsyzbot reported memory leak of struct cred. [0]\n\nnfsd_nl_threads_set_doit() passes get_current_cred() to\nnfsd_svc(), but put_cred() is not called after that.\n\nThe cred is finally passed down to _svc_xprt_create(),\nwhich calls get_cred() with the cred for struct svc_xprt.\n\nThe ownership of the refcount by get_current_cred() is not\ntransferred to anywhere and is just leaked.\n\nnfsd_svc() is also called from write_threads(), but it does\nnot bump file-\u003ef_cred there.\n\nnfsd_nl_threads_set_doit() is called from sendmsg() and\ncurrent-\u003ecred does not go away.\n\nLet\u0027s use current_cred() in nfsd_nl_threads_set_doit().\n\n[0]:\nBUG: memory leak\nunreferenced object 0xffff888108b89480 (size 184):\n  comm \"syz-executor\", pid 5994, jiffies 4294943386\n  hex dump (first 32 bytes):\n    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace (crc 369454a7):\n    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]\n    slab_post_alloc_hook mm/slub.c:4958 [inline]\n    slab_alloc_node mm/slub.c:5263 [inline]\n    kmem_cache_alloc_noprof+0x412/0x580 mm/slub.c:5270\n    prepare_creds+0x22/0x600 kernel/cred.c:185\n    copy_creds+0x44/0x290 kernel/cred.c:286\n    copy_process+0x7a7/0x2870 kernel/fork.c:2086\n    kernel_clone+0xac/0x6e0 kernel/fork.c:2651\n    __do_sys_clone+0x7f/0xb0 kernel/fork.c:2792\n    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94\n    entry_SYSCALL_64_after_hwframe+0x77/0x7f"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnfsd: Corrige la fuga de referencia de cred en nfsd_nl_threads_set_doit().\n\nsyzbot inform\u00f3 una fuga de memoria de la estructura cred. [0]\n\nnfsd_nl_threads_set_doit() pasa get_current_cred() a nfsd_svc(), pero put_cred() no es llamada despu\u00e9s de eso.\n\nEl cred es finalmente pasado a _svc_xprt_create(), que llama a get_cred() con el cred para la estructura svc_xprt.\n\nLa propiedad del contador de referencias por get_current_cred() no es transferida a ning\u00fan lugar y simplemente se fuga.\n\nnfsd_svc() tambi\u00e9n es llamada desde write_threads(), pero no incrementa file-\u0026gt;f_cred all\u00ed.\n\nnfsd_nl_threads_set_doit() es llamada desde sendmsg() y current-\u0026gt;cred no desaparece.\n\nUsemos current_cred() en nfsd_nl_threads_set_doit().\n\n[0]:\nERROR: fuga de memoria\nobjeto sin referencia 0xffff888108b89480 (tama\u00f1o 184):\n  comm \u0027syz-executor\u0027, pid 5994, jiffies 4294943386\n  volcado hexadecimal (primeros 32 bytes):\n    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................\n  backtrace (crc 369454a7):\n    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]\n    slab_post_alloc_hook mm/slub.c:4958 [inline]\n    slab_alloc_node mm/slub.c:5263 [inline]\n    kmem_cache_alloc_noprof+0x412/0x580 mm/slub.c:5270\n    prepare_creds+0x22/0x600 kernel/cred.c:185\n    copy_creds+0x44/0x290 kernel/cred.c:286\n    copy_process+0x7a7/0x2870 kernel/fork.c:2086\n    kernel_clone+0xac/0x6e0 kernel/fork.c:2651\n    __do_sys_clone+0x7f/0xb0 kernel/fork.c:2792\n    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94\n    entry_SYSCALL_64_after_hwframe+0x77/0x7f"
    }
  ],
  "id": "CVE-2026-23297",
  "lastModified": "2026-05-29T14:29:14.010",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-03-25T11:16:25.167",
  "references": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-401"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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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.
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