{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38023",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-38023"
  ],
  "published": "2025-06-18T09:29:20Z",
  "summary": "nfs: handle failure of nfs_get_lock_context in unlock path",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfs: handle failure of nfs_get_lock_context in unlock path\n\nWhen memory is insufficient, the allocation of nfs_lock_context in\nnfs_get_lock_context() fails and returns -ENOMEM. If we mistakenly treat\nan nfs4_unlockdata structure (whose l_ctx member has been set to -ENOMEM)\nas valid and proceed to execute rpc_run_task(), this will trigger a NULL\npointer dereference in nfs4_locku_prepare. For example:\n\nBUG: kernel NULL pointer dereference, address: 000000000000000c\nPGD 0 P4D 0\nOops: Oops: 0000 [#1] SMP PTI\nCPU: 15 UID: 0 PID: 12 Comm: kworker/u64:0 Not tainted 6.15.0-rc2-dirty #60\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-2.fc40\nWorkqueue: rpciod rpc_async_schedule\nRIP: 0010:nfs4_locku_prepare+0x35/0xc2\nCode: 89 f2 48 89 fd 48 c7 c7 68 69 ef b5 53 48 8b 8e 90 00 00 00 48 89 f3\nRSP: 0018:ffffbbafc006bdb8 EFLAGS: 00010246\nRAX: 000000000000004b RBX: ffff9b964fc1fa00 RCX: 0000000000000000\nRDX: 0000000000000000 RSI: fffffffffffffff4 RDI: ffff9ba53fddbf40\nRBP: ffff9ba539934000 R08: 0000000000000000 R09: ffffbbafc006bc38\nR10: ffffffffb6b689c8 R11: 0000000000000003 R12: ffff9ba539934030\nR13: 0000000000000001 R14: 0000000004248060 R15: ffffffffb56d1c30\nFS: 0000000000000000(0000) GS:ffff9ba5881f0000(0000) knlGS:00000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 000000000000000c CR3: 000000093f244000 CR4: 00000000000006f0\nCall Trace:\n <TASK>\n __rpc_execute+0xbc/0x480\n rpc_async_schedule+0x2f/0x40\n process_one_work+0x232/0x5d0\n worker_thread+0x1da/0x3d0\n ? __pfx_worker_thread+0x10/0x10\n kthread+0x10d/0x240\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x34/0x50\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1a/0x30\n </TASK>\nModules linked in:\nCR2: 000000000000000c\n---[ end trace 0000000000000000 ]---\n\nFree the allocated nfs4_unlockdata when nfs_get_lock_context() fails and\nreturn NULL to terminate subsequent rpc_run_task, preventing NULL pointer\ndereference.",
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