CVE-2026-23297 (GCVE-0-2026-23297)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:26 – Updated: 2026-03-25 10:26
VLAI?
Title
nfsd: Fix cred ref leak in nfsd_nl_threads_set_doit().
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
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 924f4fb003ba114c60b3c07a011dcd86a8956cd1 , < 41170716421c25cd20b39e83f0e0762e212b377b (git)
Affected: 924f4fb003ba114c60b3c07a011dcd86a8956cd1 , < 27c13c5bb0948e3b5c64e59f8a903231896fab9b (git)
Affected: 924f4fb003ba114c60b3c07a011dcd86a8956cd1 , < a3f88e3e18b51a7f654189189c762ebcdeaa7e29 (git)
Affected: 924f4fb003ba114c60b3c07a011dcd86a8956cd1 , < 1cb968a2013ffa8112d52ebe605009ea1c6a582c (git)
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    Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.77 , ≤ 6.12.* (semver)
Unaffected: 6.18.17 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0-rc3 , ≤ * (original_commit_for_fix)
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      "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"
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        "dateUpdated": "2026-03-25T10:26:54.156Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/41170716421c25cd20b39e83f0e0762e212b377b"
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          "url": "https://git.kernel.org/stable/c/27c13c5bb0948e3b5c64e59f8a903231896fab9b"
        },
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          "url": "https://git.kernel.org/stable/c/a3f88e3e18b51a7f654189189c762ebcdeaa7e29"
        },
        {
          "url": "https://git.kernel.org/stable/c/1cb968a2013ffa8112d52ebe605009ea1c6a582c"
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      ],
      "title": "nfsd: Fix cred ref leak in nfsd_nl_threads_set_doit().",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23297",
    "datePublished": "2026-03-25T10:26:54.156Z",
    "dateReserved": "2026-01-13T15:37:45.993Z",
    "dateUpdated": "2026-03-25T10:26:54.156Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23297\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-03-25T11:16:25.167\",\"lastModified\":\"2026-03-25T15:41:33.977\",\"vulnStatus\":\"Awaiting Analysis\",\"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\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1cb968a2013ffa8112d52ebe605009ea1c6a582c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/27c13c5bb0948e3b5c64e59f8a903231896fab9b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/41170716421c25cd20b39e83f0e0762e212b377b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a3f88e3e18b51a7f654189189c762ebcdeaa7e29\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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