CVE-2025-38023

MEDIUM EPSS 6.8%
Published Jun 18, 20251y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Jun 18, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
6.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 14

VendorProductVersionRange
linuxlinux_kernel*≥4.12  –  <5.4.294
linuxlinux_kernel*≥5.5  –  <5.10.238
linuxlinux_kernel*≥5.11  –  <5.15.184
linuxlinux_kernel*≥5.16  –  <6.1.140
linuxlinux_kernel*≥6.2  –  <6.6.92
linuxlinux_kernel*≥6.7  –  <6.12.30
linuxlinux_kernel*≥6.13  –  <6.14.8
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
linuxlinux_kernel6.15any
debiandebian_linux11.0any

References 10

  • git.kernel.org https://git.kernel.org/stable/c/4c189fd40a09a03f9a900bedb2d9064f1734d72a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/72f552e00c50f265896d3c19edc6696aa2910081
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/85fb7f8ca5f8c138579fdfc9b97b3083e6077d40
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a6879a076b98c99c9fe747816fe1c29543442441
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c457dc1ec770a22636b473ce5d35614adfe97636
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/da824f1271633bcb515ca8084cda3eda4b3ace51
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/db6f5ee1fc8f54d079d0751292c2fc2d78e3aad1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f601960af04d2ecb007c928ba153d34051acd9c1
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html
    Third Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
    Third Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/4c189fd40a09a03f9a900bedb2d9064f1734d72a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/72f552e00c50f265896d3c19edc6696aa2910081
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/85fb7f8ca5f8c138579fdfc9b97b3083e6077d40
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a6879a076b98c99c9fe747816fe1c29543442441
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c457dc1ec770a22636b473ce5d35614adfe97636
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/da824f1271633bcb515ca8084cda3eda4b3ace51
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/db6f5ee1fc8f54d079d0751292c2fc2d78e3aad1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f601960af04d2ecb007c928ba153d34051acd9c1
    Patch