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Review reviewHigh

CVE-2025-40044

Linux

In the Linux kernel, the following vulnerability has been resolved: fs: udf: fix OOB read in lengthAllocDescs handling When parsing Allocation Extent Descriptor, lengthAllocDescs comes from on-disk data and must be validated against the block size. Crafted or corrupted images may set lengthAllocDescs so that the total descriptor length (sizeof(allocExtDesc) + lengthAllocDescs) exceeds the buffer, leading udf_update_tag() to call crc_itu_t() on out-of-bounds memory and trigger a KASAN use-after-free read. BUG: KASAN: use-after-free in crc_itu_t+0x1d5/0x2b0 lib/crc-itu-t.c:60 Read of size 1 a...

CVSS
7.8
EPSS
0.16%
5.76% percentile
CISA KEV
Not listed
Published
2025.10.28
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.16%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: fs: udf: fix OOB read in lengthAllocDescs handling When parsing Allocation Extent Descriptor, lengthAllocDescs comes from on-disk data and must be validated against the block size. Crafted or corrupted images may set lengthAllocDescs so that the total descriptor length (sizeof(allocExtDesc) + lengthAllocDescs) exceeds the buffer, leading udf_update_tag() to call crc_itu_t() on out-of-bounds memory and trigger a KASAN use-after-free read. BUG: KASAN: use-after-free in crc_itu_t+0x1d5/0x2b0 lib/crc-itu-t.c:60 Read of size 1 a...

Affected product and versions

Product
Linux
Affected versions
>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 14496175b264d30c2045584ee31d062af2e3a660, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d2ed9aa8ae50fb0d4ac5ab07e4c67ba7e9a24818, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1d1847812a1a5375c10a2a779338df643f79c047, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 918649364fbca7d5df72522ca795479edcd25f91, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a70dcfa8d0a0cc530a6af59483dfca260b652c1b, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b57f2d7d3e6bb89ed82330c5fe106cdfa34d3e24, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 459404f858213967ccfff336c41747d8dd186d38, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 3bd5e45c2ce30e239d596becd5db720f7eb83c99, >= 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:N/UI:R/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2025-40044 — Linux | SECUFOCUS NOW