CVE-2025-38023
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: nfs: handle failure of nfs_get_lock_context in unlock path When memory is insufficient, the allocation of nfs_lock_context in nfs_get_lock_context() fails and returns -ENOMEM. If we mistakenly treat an nfs4_unlockdata structure (whose l_ctx member has been set to -ENOMEM) as valid and proceed to execute rpc_run_task(), this will trigger a NULL pointer dereference in nfs4_locku_prepare. For example: BUG: kernel NULL pointer dereference, address: 000000000000000c PGD 0 P4D 0 Oops: Oops: 0000 [#1] SMP PTI CPU: 15 UID: 0 PID: 12 Comm: kworker/u64:0 Not tainted 6.15.0-rc2-dirty #60 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-2.fc40 Workqueue: rpciod rpc_async_schedule RIP: 0010:nfs4_locku_prepare+0x35/0xc2 Code: 89 f2 48 89 fd 48 c7 c7 68 69 ef b5 53 48 8b 8e 90 00 00 00 48 89 f3 RSP: 0018:ffffbbafc006bdb8 EFLAGS: 00010246 RAX: 000000000000004b RBX: ffff9b964fc1fa00 RCX: 0000000000000000 RDX: 0000000000000000 RSI: fffffffffffffff4 RDI: ffff9ba53fddbf40 RBP: ffff9ba539934000 R08: 0000000000000000 R09: ffffbbafc006bc38 R10: ffffffffb6b689c8 R11: 0000000000000003 R12: ffff9ba539934030 R13: 0000000000000001 R14: 0000000004248060 R15: ffffffffb56d1c30 FS: 0000000000000000(0000) GS:ffff9ba5881f0000(0000) knlGS:00000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000000000c CR3: 000000093f244000 CR4: 00000000000006f0 Call Trace: <TASK> __rpc_execute+0xbc/0x480 rpc_async_schedule+0x2f/0x40 process_one_work+0x232/0x5d0 worker_thread+0x1da/0x3d0 ? __pfx_worker_thread+0x10/0x10 kthread+0x10d/0x240 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x34/0x50 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30 </TASK> Modules linked in: CR2: 000000000000000c ---[ end trace 0000000000000000 ]--- Free the allocated nfs4_unlockdata when nfs_get_lock_context() fails and return NULL to terminate subsequent rpc_run_task, preventing NULL pointer dereference.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-06-18 10:15:34.100000
Last modified
2026-11-05 21:18:04.840000
View original CVE JSON
{
"id": "CVE-2025-38023",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-06-18T10:15:34.100",
"lastModified": "2026-11-05T21:18:04.840",
"vulnStatus": "Analyzed",
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{
"lang": "en",
"value": "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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{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nfs: fallo en el manejo de nfs_get_lock_context en la ruta de desbloqueo. Cuando la memoria es insuficiente, la asignación de nfs_lock_context en nfs_get_lock_context() falla y devuelve -ENOMEM. Si por error tratamos una estructura nfs4_unlockdata (cuyo miembro l_ctx se ha establecido en -ENOMEM) como válida y procedemos a ejecutar rpc_run_task(), se activará una desreferencia de puntero NULL en nfs4_locku_prepare. Por ejemplo: ERROR: desreferencia de puntero NULL del núcleo, dirección: 000000000000000c PGD 0 P4D 0 Oops: Oops: 0000 [#1] SMP PTI CPU: 15 UID: 0 PID: 12 Comm: kworker/u64:0 Not tainted 6.15.0-rc2-dirty #60 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-2.fc40 Workqueue: rpciod rpc_async_schedule RIP: 0010:nfs4_locku_prepare+0x35/0xc2 Code: 89 f2 48 89 fd 48 c7 c7 68 69 ef b5 53 48 8b 8e 90 00 00 00 48 89 f3 RSP: 0018:ffffbbafc006bdb8 EFLAGS: 00010246 RAX: 000000000000004b RBX: ffff9b964fc1fa00 RCX: 0000000000000000 RDX: 0000000000000000 RSI: fffffffffffffff4 RDI: ffff9ba53fddbf40 RBP: ffff9ba539934000 R08: 0000000000000000 R09: ffffbbafc006bc38 R10: ffffffffb6b689c8 R11: 0000000000000003 R12: ffff9ba539934030 R13: 0000000000000001 R14: 0000000004248060 R15: ffffffffb56d1c30 FS: 0000000000000000(0000) GS:ffff9ba5881f0000(0000) knlGS:00000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000000000c CR3: 000000093f244000 CR4: 00000000000006f0 Call Trace: __rpc_execute+0xbc/0x480 rpc_async_schedule+0x2f/0x40 process_one_work+0x232/0x5d0 worker_thread+0x1da/0x3d0 ? __pfx_worker_thread+0x10/0x10 kthread+0x10d/0x240 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x34/0x50 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30 Modules linked in: CR2: 000000000000000c [ fin de seguimiento 0000000000000000 ]--- Libera el nfs4_unlockdata asignado cuando nfs_get_lock_context() falla y devuelve NULL para finalizar la rpc_run_task posterior, lo que evita la desreferencia del puntero NULL."
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