CVE-2026-64324 (GCVE-0-2026-64324)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-10-19 20:38
VLAI
Title
udf: validate free block extents against the partition length
Summary
In the Linux kernel, the following vulnerability has been resolved: udf: validate free block extents against the partition length udf_free_blocks() checks the logical block number and count against the partition length, but drops the extent offset from that final bound. A crafted extent can pass the guard while logicalBlockNum + offset + count points past the partition, which later indexes past the space bitmap array. A single ftruncate(2) on a file backed by such an extent reliably panics the kernel. This is a local availability issue. On desktop systems where UDisks/polkit allows the active user to mount removable UDF media without CAP_SYS_ADMIN, an unprivileged local user can supply the crafted filesystem and trigger the panic by truncating a writable file on it. Systems that require root or CAP_SYS_ADMIN to mount the image have a higher prerequisite. No confidentiality or integrity impact is claimed: the reproduced primitive is an out-of-bounds read of a bitmap pointer slot followed by a kernel panic. Use the already computed logicalBlockNum + offset + count value for the partition length check. Also make load_block_bitmap() reject an out-of-range block group before indexing s_block_bitmap[], so corrupted callers cannot walk past the flexible array.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:39 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 934f815345c09c290a9b9a9cfdddc203ec2117e8 , < fdd6229d2ae9914c1f25d1041db0f4f312a4fa76 (git)
Affected: 22cc7323f090646c8cfb5939e6f15bdc2ed3fd27 , < b54aee5652fcd7c23a0904a4623ec462c3edc70c (git)
Affected: 7c4fa9ebfce69619d132fe703dc2e2cf62a13723 , < 12af328d2ee8d68e81ba612246d0b54b22d23e1f (git)
Affected: 5cc9745e2ea11aef7d5c9a42bc36f6cd3e1b4cc3 , < fb49099206c5c57af28a157249fa7bcb5518f99e (git)
Affected: 56e69e59751d20993f243fb7dd6991c4e522424c , < 9442d75429b0c556292a7454fe888d54259f5240 (git)
Affected: 56e69e59751d20993f243fb7dd6991c4e522424c , < 335202ab25b01fdd45889ff25eab70864686dea3 (git)
Affected: 56e69e59751d20993f243fb7dd6991c4e522424c , < be87de7789a82a030a4896bc7683415ec9fa6f2b (git)
Affected: 56e69e59751d20993f243fb7dd6991c4e522424c , < 5f0419457f89dce1a3f1c8e62a3adf2f39ab8168 (git)
Affected: 097420e48e30f51e8f4f650b5c946f5af63ec1a3 (git)
Affected: 5def895b42ef16a2da6402818cba8d7ec8ede1ef (git)
Affected: 05fb2bf477d3fe5421bd4cb699574737f52bd88b (git)
Affected: 5.10.224 , < 5.10.261 (semver)
Affected: 5.15.165 , < 5.15.212 (semver)
Affected: 6.1.105 , < 6.1.178 (semver)
Affected: 6.6.46 , < 6.6.145 (semver)
Affected: 4.19.320 , < 4.20 (semver)
Affected: 5.4.282 , < 5.5 (semver)
Affected: 6.10.5 , < 6.11 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudf: validate free block extents against the partition length\n\nudf_free_blocks() checks the logical block number and count against the\npartition length, but drops the extent offset from that final bound.  A\ncrafted extent can pass the guard while logicalBlockNum + offset + count\npoints past the partition, which later indexes past the space bitmap\narray.\n\nA single ftruncate(2) on a file backed by such an extent reliably\npanics the kernel.  This is a local availability issue.  On desktop\nsystems where UDisks/polkit allows the active user to mount removable\nUDF media without CAP_SYS_ADMIN, an unprivileged local user can supply\nthe crafted filesystem and trigger the panic by truncating a writable\nfile on it.  Systems that require root or CAP_SYS_ADMIN to mount the\nimage have a higher prerequisite.\n\nNo confidentiality or integrity impact is claimed: the reproduced\nprimitive is an out-of-bounds read of a bitmap pointer slot followed by\na kernel panic.\n\nUse the already computed logicalBlockNum + offset + count value for the\npartition length check.  Also make load_block_bitmap() reject an\nout-of-range block group before indexing s_block_bitmap[], so corrupted\ncallers cannot walk past the flexible array."
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      "title": "udf: validate free block extents against the partition length",
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    "dateUpdated": "2026-10-19T20:38:24.164Z",
    "state": "PUBLISHED"
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                  "lang": "en",
                  "value": "AV:L - The flaw is reached through a local ftruncate(2) on a crafted, mounted UDF filesystem; no network protocol reaches this path.\nAC:L - The attacker controls the malicious extent and truncation offset, and a single ftruncate(2) reliably triggers the fault without a race or uncontrollable condition.\nPR:L - UDF cannot be mounted through an unprivileged user namespace, but default [UDisks policy](https://storaged.org/doc/udisks2-api/latest/udisks-polkit-ac tions.html) permits an active unprivileged user to mount removable media without administrator authentication.\nUI:N - The attacking local user can mount the supplied removable filesystem and truncate its writable file directly; no separate victim action is required.\nS:U - The vulnerable UDF code and the affected kernel resources remain within the host kernel\u0027s security authority; ordinary kernel privilege escalation does not change scope.\nC:H - Although the reproduced path is an out-of-bounds pointer-slot read followed by panic, a zero-valued out-of-range slot causes read_block_bitmap() to write a buffer_head pointer through that attacker-selected slot. Under the required higher-severity rule, this exploitable kernel heap corruption can enable code execution and unrestricted disclosure.\nI:H - The conditional out-of-bounds buffer_head pointer store corrupts kernel heap memory at an attacker-selected array index and can potentially alter control-relevant objects. This supports control-flow hijacking or arbitrary modification under the required higher-severity assumption.\nA:H - The [upstream report](https://lkml.iu.edu/2605.1/15216.html) confirms that one ftruncate(2) reliably panics the kernel, causing complete system unavailability."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-17T04:53:26.109Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/fdd6229d2ae9914c1f25d1041db0f4f312a4fa76"
            },
            {
              "url": "https://git.kernel.org/stable/c/b54aee5652fcd7c23a0904a4623ec462c3edc70c"
            },
            {
              "url": "https://git.kernel.org/stable/c/12af328d2ee8d68e81ba612246d0b54b22d23e1f"
            },
            {
              "url": "https://git.kernel.org/stable/c/fb49099206c5c57af28a157249fa7bcb5518f99e"
            },
            {
              "url": "https://git.kernel.org/stable/c/9442d75429b0c556292a7454fe888d54259f5240"
            },
            {
              "url": "https://git.kernel.org/stable/c/335202ab25b01fdd45889ff25eab70864686dea3"
            },
            {
              "url": "https://git.kernel.org/stable/c/be87de7789a82a030a4896bc7683415ec9fa6f2b"
            },
            {
              "url": "https://git.kernel.org/stable/c/5f0419457f89dce1a3f1c8e62a3adf2f39ab8168"
            }
          ],
          "title": "udf: validate free block extents against the partition length",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-64324",
        "datePublished": "2026-07-25T08:49:52.063Z",
        "dateReserved": "2026-07-19T15:36:31.780Z",
        "dateUpdated": "2026-10-19T20:38:24.164Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

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    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.