CVE-2025-38059

MEDIUM EPSS 5.1%
Published Jun 18, 20251y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
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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: avoid NULL pointer dereference if no valid csum tree [BUG] When trying read-only scrub on a btrfs with rescue=idatacsums mount option, it will crash with the following call trace: BUG: kernel NULL pointer dereference, address: 0000000000000208 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page CPU: 1 UID: 0 PID: 835 Comm: btrfs Tainted: G O 6.15.0-rc3-custom+ #236 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022 RIP: 0010:btrfs_lookup_csums_bitmap+0x49/0x480 [btrfs] Call Trace: <TASK> scrub_find_fill_first_stripe+0x35b/0x3d0 [btrfs] scrub_simple_mirror+0x175/0x290 [btrfs] scrub_stripe+0x5f7/0x6f0 [btrfs] scrub_chunk+0x9a/0x150 [btrfs] scrub_enumerate_chunks+0x333/0x660 [btrfs] btrfs_scrub_dev+0x23e/0x600 [btrfs] btrfs_ioctl+0x1dcf/0x2f80 [btrfs] __x64_sys_ioctl+0x97/0xc0 do_syscall_64+0x4f/0x120 entry_SYSCALL_64_after_hwframe+0x76/0x7e [CAUSE] Mount option "rescue=idatacsums" will completely skip loading the csum tree, so that any data read will not find any data csum thus we will ignore data checksum verification. Normally call sites utilizing csum tree will check the fs state flag NO_DATA_CSUMS bit, but unfortunately scrub does not check that bit at all. This results in scrub to call btrfs_search_slot() on a NULL pointer and triggered above crash. [FIX] Check both extent and csum tree root before doing any tree search.

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
5.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 8

VendorProductVersionRange
linuxlinux_kernel*≥5.9  –  <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

References 4

  • git.kernel.org https://git.kernel.org/stable/c/50d0de59f66cbe6d597481e099bf1c70fd07e0a9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6e9770de024964b1017f99ee94f71967bd6edaeb
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d35bed14b0bc95c6845863a3744ecd10b888c830
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f95d186255b319c48a365d47b69bd997fecb674e
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/50d0de59f66cbe6d597481e099bf1c70fd07e0a9
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6e9770de024964b1017f99ee94f71967bd6edaeb
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d35bed14b0bc95c6845863a3744ecd10b888c830
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f95d186255b319c48a365d47b69bd997fecb674e
    Patch