Vulnerability-Lookup

FKIE_CVE-2026-31512

Vulnerability from fkie_nvd - Published: 2026-04-22 14:16 - Updated: 2026-04-28 15:08

Severity ?

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv() l2cap_ecred_data_rcv() reads the SDU length field from skb->data using get_unaligned_le16() without first verifying that skb contains at least L2CAP_SDULEN_SIZE (2) bytes. When skb->len is less than 2, this reads past the valid data in the skb. The ERTM reassembly path correctly calls pskb_may_pull() before reading the SDU length (l2cap_reassemble_sdu, L2CAP_SAR_START case). Apply the same validation to the Enhanced Credit Based Flow Control data path.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3340be2bafdcc806f048273ea6d8e82a6597aa1b	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/40c7f7eea2f4d9cb0b3e924254c8c9053372168f	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/477ad4976072056c348937e94f24583321938df4	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5ad981249be52f5e4e92e0e97b436b569071cb86	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8c96f3bd4ae0802db90630be8e9851827e9c9209	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c65bd945d1c08c3db756821b6bf9f1c4a77b29c6	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cef09691cfb61f6c91cc27c3d69634f81c8ab949	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e47315b84d0eb188772c3ff5cf073cdbdefca6b4	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	3.14
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv()\n\nl2cap_ecred_data_rcv() reads the SDU length field from skb-\u003edata using\nget_unaligned_le16() without first verifying that skb contains at least\nL2CAP_SDULEN_SIZE (2) bytes. When skb-\u003elen is less than 2, this reads\npast the valid data in the skb.\n\nThe ERTM reassembly path correctly calls pskb_may_pull() before reading\nthe SDU length (l2cap_reassemble_sdu, L2CAP_SAR_START case). Apply the\nsame validation to the Enhanced Credit Based Flow Control data path."
    }
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  "id": "CVE-2026-31512",
  "lastModified": "2026-04-28T15:08:37.783",
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          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
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          "scope": "UNCHANGED",
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  "published": "2026-04-22T14:16:50.490",
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}

CVE-2026-31512 (GCVE-0-2026-31512)

Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-04-22 13:54

Title

Bluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv()

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/cef09691cfb61f6c9…
	https://git.kernel.org/stable/c/3340be2bafdcc806f…
	https://git.kernel.org/stable/c/e47315b84d0eb1887…
	https://git.kernel.org/stable/c/477ad4976072056c3…
	https://git.kernel.org/stable/c/40c7f7eea2f4d9cb0…
	https://git.kernel.org/stable/c/8c96f3bd4ae0802db…
	https://git.kernel.org/stable/c/5ad981249be52f5e4…
	https://git.kernel.org/stable/c/c65bd945d1c08c3db…

Impacted products

Vendor

Product

Version

Linux

Affected: aac23bf636593cc2d67144aed373a46a1a5f76b1 , < cef09691cfb61f6c91cc27c3d69634f81c8ab949 (git)
Affected: aac23bf636593cc2d67144aed373a46a1a5f76b1 , < 3340be2bafdcc806f048273ea6d8e82a6597aa1b (git)
Affected: aac23bf636593cc2d67144aed373a46a1a5f76b1 , < e47315b84d0eb188772c3ff5cf073cdbdefca6b4 (git)
Affected: aac23bf636593cc2d67144aed373a46a1a5f76b1 , < 477ad4976072056c348937e94f24583321938df4 (git)
Affected: aac23bf636593cc2d67144aed373a46a1a5f76b1 , < 40c7f7eea2f4d9cb0b3e924254c8c9053372168f (git)
Affected: aac23bf636593cc2d67144aed373a46a1a5f76b1 , < 8c96f3bd4ae0802db90630be8e9851827e9c9209 (git)
Affected: aac23bf636593cc2d67144aed373a46a1a5f76b1 , < 5ad981249be52f5e4e92e0e97b436b569071cb86 (git)
Affected: aac23bf636593cc2d67144aed373a46a1a5f76b1 , < c65bd945d1c08c3db756821b6bf9f1c4a77b29c6 (git)

Linux

Affected: 3.14
Unaffected: 0 , < 3.14 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.131 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/l2cap_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
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              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.1.168",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.131",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.80",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.18.21",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.19.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv()\n\nl2cap_ecred_data_rcv() reads the SDU length field from skb-\u003edata using\nget_unaligned_le16() without first verifying that skb contains at least\nL2CAP_SDULEN_SIZE (2) bytes. When skb-\u003elen is less than 2, this reads\npast the valid data in the skb.\n\nThe ERTM reassembly path correctly calls pskb_may_pull() before reading\nthe SDU length (l2cap_reassemble_sdu, L2CAP_SAR_START case). Apply the\nsame validation to the Enhanced Credit Based Flow Control data path."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-22T13:54:30.171Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        }
      ],
      "title": "Bluetooth: L2CAP: Validate PDU length before reading SDU length in l2cap_ecred_data_rcv()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31512",
    "datePublished": "2026-04-22T13:54:30.171Z",
    "dateReserved": "2026-03-09T15:48:24.107Z",
    "dateUpdated": "2026-04-22T13:54:30.171Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

Action not permitted

FKIE_CVE-2026-31512

CVE-2026-31512 (GCVE-0-2026-31512)

Tags

Sightings

Nomenclature