CVE-2025-38034

MEDIUM EPSS 6.7%
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: btrfs: correct the order of prelim_ref arguments in btrfs__prelim_ref btrfs_prelim_ref() calls the old and new reference variables in the incorrect order. This causes a NULL pointer dereference because oldref is passed as NULL to trace_btrfs_prelim_ref_insert(). Note, trace_btrfs_prelim_ref_insert() is being called with newref as oldref (and oldref as NULL) on purpose in order to print out the values of newref. To reproduce: echo 1 > /sys/kernel/debug/tracing/events/btrfs/btrfs_prelim_ref_insert/enable Perform some writeback operations. Backtrace: BUG: kernel NULL pointer dereference, address: 0000000000000018 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 115949067 P4D 115949067 PUD 11594a067 PMD 0 Oops: Oops: 0000 [#1] SMP NOPTI CPU: 1 UID: 0 PID: 1188 Comm: fsstress Not tainted 6.15.0-rc2-tester+ #47 PREEMPT(voluntary) 7ca2cef72d5e9c600f0c7718adb6462de8149622 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-2-gc13ff2cd-prebuilt.qemu.org 04/01/2014 RIP: 0010:trace_event_raw_event_btrfs__prelim_ref+0x72/0x130 Code: e8 43 81 9f ff 48 85 c0 74 78 4d 85 e4 0f 84 8f 00 00 00 49 8b 94 24 c0 06 00 00 48 8b 0a 48 89 48 08 48 8b 52 08 48 89 50 10 <49> 8b 55 18 48 89 50 18 49 8b 55 20 48 89 50 20 41 0f b6 55 28 88 RSP: 0018:ffffce44820077a0 EFLAGS: 00010286 RAX: ffff8c6b403f9014 RBX: ffff8c6b55825730 RCX: 304994edf9cf506b RDX: d8b11eb7f0fdb699 RSI: ffff8c6b403f9010 RDI: ffff8c6b403f9010 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000010 R10: 00000000ffffffff R11: 0000000000000000 R12: ffff8c6b4e8fb000 R13: 0000000000000000 R14: ffffce44820077a8 R15: ffff8c6b4abd1540 FS: 00007f4dc6813740(0000) GS:ffff8c6c1d378000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000018 CR3: 000000010eb42000 CR4: 0000000000750ef0 PKRU: 55555554 Call Trace: <TASK> prelim_ref_insert+0x1c1/0x270 find_parent_nodes+0x12a6/0x1ee0 ? __entry_text_end+0x101f06/0x101f09 ? srso_alias_return_thunk+0x5/0xfbef5 ? srso_alias_return_thunk+0x5/0xfbef5 ? srso_alias_return_thunk+0x5/0xfbef5 ? srso_alias_return_thunk+0x5/0xfbef5 btrfs_is_data_extent_shared+0x167/0x640 ? fiemap_process_hole+0xd0/0x2c0 extent_fiemap+0xa5c/0xbc0 ? __entry_text_end+0x101f05/0x101f09 btrfs_fiemap+0x7e/0xd0 do_vfs_ioctl+0x425/0x9d0 __x64_sys_ioctl+0x75/0xc0

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
6.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 13

VendorProductVersionRange
linuxlinux_kernel* <5.4.294
linuxlinux_kernel*≥5.5  –  <5.10.238
linuxlinux_kernel*≥5.11  –  <5.15.185
linuxlinux_kernel*≥5.16  –  <6.1.141
linuxlinux_kernel*≥6.2  –  <6.6.93
linuxlinux_kernel*≥6.7  –  <6.12.31
linuxlinux_kernel*≥6.13  –  <6.14.9
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/0528bba48dce7820d2da72e1a114e1c4552367eb
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/137bfa08c6441f324d00692d1e9d22cfd773329b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5755b6731655e248c4f1d52a2e1b18795b4a2a3a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7a97f961a568a8f72472dc804af02a0f73152c5f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7f7c8c03feba5f2454792fab3bb8bd45bd6883f9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a641154cedf9d69730f8af5d0a901fe86e6486bd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a876703894a6dd6e8c04b0635d86e9f7a7c81b79
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bc7e0975093567f51be8e1bdf4aa5900a3cf0b1e
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
    Third Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
    Third Party Advisory

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/0528bba48dce7820d2da72e1a114e1c4552367eb
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/137bfa08c6441f324d00692d1e9d22cfd773329b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/5755b6731655e248c4f1d52a2e1b18795b4a2a3a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7a97f961a568a8f72472dc804af02a0f73152c5f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7f7c8c03feba5f2454792fab3bb8bd45bd6883f9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a641154cedf9d69730f8af5d0a901fe86e6486bd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a876703894a6dd6e8c04b0635d86e9f7a7c81b79
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bc7e0975093567f51be8e1bdf4aa5900a3cf0b1e
    Patch