FKIE_CVE-2025-40241

Vulnerability from fkie_nvd - Published: 2025-12-04 16:16 - Updated: 2025-12-04 17:15
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: erofs: fix crafted invalid cases for encoded extents Robert recently reported two corrupted images that can cause system crashes, which are related to the new encoded extents introduced in Linux 6.15: - The first one [1] has plen != 0 (e.g. plen == 0x2000000) but (plen & Z_EROFS_EXTENT_PLEN_MASK) == 0. It is used to represent special extents such as sparse extents (!EROFS_MAP_MAPPED), but previously only plen == 0 was handled; - The second one [2] has pa 0xffffffffffdcffed and plen 0xb4000, then "cur [0xfffffffffffff000] += bvec.bv_len [0x1000]" in "} while ((cur += bvec.bv_len) < end);" wraps around, causing an out-of-bound access of pcl->compressed_bvecs[] in z_erofs_submit_queue(). EROFS only supports 48-bit physical block addresses (up to 1EiB for 4k blocks), so add a sanity check to enforce this.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/00d8fe0b72f4ca0a983abced36aad2160038c421
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a429b76114aaca3ef1aff4cd469dcf025431bd11
Impacted products
Vendor Product Version
To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: fix crafted invalid cases for encoded extents\n\nRobert recently reported two corrupted images that can cause system\ncrashes, which are related to the new encoded extents introduced\nin Linux 6.15:\n\n  - The first one [1] has plen != 0 (e.g. plen == 0x2000000) but\n    (plen \u0026 Z_EROFS_EXTENT_PLEN_MASK) == 0. It is used to represent\n    special extents such as sparse extents (!EROFS_MAP_MAPPED), but\n    previously only plen == 0 was handled;\n\n  - The second one [2] has pa 0xffffffffffdcffed and plen 0xb4000,\n    then \"cur [0xfffffffffffff000] += bvec.bv_len [0x1000]\" in\n    \"} while ((cur += bvec.bv_len) \u003c end);\" wraps around, causing an\n    out-of-bound access of pcl-\u003ecompressed_bvecs[] in\n    z_erofs_submit_queue().  EROFS only supports 48-bit physical block\n    addresses (up to 1EiB for 4k blocks), so add a sanity check to\n    enforce this."
    }
  ],
  "id": "CVE-2025-40241",
  "lastModified": "2025-12-04T17:15:08.283",
  "metrics": {},
  "published": "2025-12-04T16:16:17.250",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/00d8fe0b72f4ca0a983abced36aad2160038c421"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a429b76114aaca3ef1aff4cd469dcf025431bd11"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.