CVE-2025-38023

Description

In the Linux kernel, the following vulnerability has been resolved:nfs: handle failure of nfs_get_lock_context in unlock pathWhen memory is insufficient, the allocation of nfs_lock_context innfs_get_lock_context() fails and returns -ENOMEM. If we mistakenly treatan 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 nullpointer dereference in nfs4_locku_prepare. For example:BUG: kernel null pointer dereference, address: 000000000000000cPGD 0 P4D 0Oops: Oops: 0000 [#1] SMP PTICPU: 15 UID: 0 PID: 12 Comm: kworker/u64:0 Not tainted 6.15.0-rc2-dirty #60Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-2.fc40Workqueue: rpciod rpc_async_scheduleRIP: 0010:nfs4_locku_prepare+0x35/0xc2Code: 89 f2 48 89 fd 48 c7 c7 68 69 ef b5 53 48 8b 8e 90 00 00 00 48 89 f3RSP: 0018:ffffbbafc006bdb8 EFLAGS: 00010246RAX: 000000000000004b RBX: ffff9b964fc1fa00 RCX: 0000000000000000RDX: 0000000000000000 RSI: fffffffffffffff4 RDI: ffff9ba53fddbf40RBP: ffff9ba539934000 R08: 0000000000000000 R09: ffffbbafc006bc38R10: ffffffffb6b689c8 R11: 0000000000000003 R12: ffff9ba539934030R13: 0000000000000001 R14: 0000000004248060 R15: ffffffffb56d1c30FS: 0000000000000000(0000) GS:ffff9ba5881f0000(0000) knlGS:00000000CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033CR2: 000000000000000c CR3: 000000093f244000 CR4: 00000000000006f0Call 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---[ end trace 0000000000000000 ]---Free the allocated nfs4_unlockdata when nfs_get_lock_context() fails andreturn null to terminate subsequent rpc_run_task, preventing null pointerdereference.

Risk Information

Associated Vulnerability

Patch Details

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234