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Review reviewHigh

CVE-2025-40244

Linux

In the Linux kernel, the following vulnerability has been resolved: hfsplus: fix KMSAN uninit-value issue in __hfsplus_ext_cache_extent() The syzbot reported issue in __hfsplus_ext_cache_extent(): [ 70.194323][ T9350] BUG: KMSAN: uninit-value in __hfsplus_ext_cache_extent+0x7d0/0x990 [ 70.195022][ T9350] __hfsplus_ext_cache_extent+0x7d0/0x990 [ 70.195530][ T9350] hfsplus_file_extend+0x74f/0x1cf0 [ 70.195998][ T9350] hfsplus_get_block+0xe16/0x17b0 [ 70.196458][ T9350] __block_write_begin_int+0x962/0x2ce0 [ 70.196959][ T9350] cont_write_begin+0x1000/0x1950 [ 70.197416][ T9350] hfsplus_write_b...

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2025.12.05
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: hfsplus: fix KMSAN uninit-value issue in __hfsplus_ext_cache_extent() The syzbot reported issue in __hfsplus_ext_cache_extent(): [ 70.194323][ T9350] BUG: KMSAN: uninit-value in __hfsplus_ext_cache_extent+0x7d0/0x990 [ 70.195022][ T9350] __hfsplus_ext_cache_extent+0x7d0/0x990 [ 70.195530][ T9350] hfsplus_file_extend+0x74f/0x1cf0 [ 70.195998][ T9350] hfsplus_get_block+0xe16/0x17b0 [ 70.196458][ T9350] __block_write_begin_int+0x962/0x2ce0 [ 70.196959][ T9350] cont_write_begin+0x1000/0x1950 [ 70.197416][ T9350] hfsplus_write_b...

Affected product and versions

Product
Linux
Affected versions
>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c1ec90bed504640a42bb20a5f413be39cd17ad71, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b8a72692aa42b7dcd179a96b90bc2763ac74576a, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c135b8dca65526aa5b8814e9954e0ae317d9c598, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d7e313039a8f3a6ee072dc5ff4643234d2d735cf, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a5bfb13b4f406aef1a450f99d22d3e48df01528c, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 99202d94909d323a30d154ab0261c0a07166daec, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 14c673a2f3ecf650b694a52a88688f1d71849899, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4840ceadef4290c56cc422f0fc697655f3cbf070, >= 2.6.12
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available