CVE-2026-72014 (GCVE-0-2026-72014)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-08-17 05:39
VLAI
Title
drbd: reject data replies with an out-of-range payload size
Summary
In the Linux kernel, the following vulnerability has been resolved: drbd: reject data replies with an out-of-range payload size recv_dless_read() receives a P_DATA_REPLY from a peer into the bio of an outstanding read request. The peer-supplied payload length reaches it as the signed int data_size, and two peer-controlled inputs can make it negative. With a negotiated data-integrity-alg the digest length is subtracted first, so a reply whose payload is smaller than the digest underflows data_size. With no integrity algorithm (the default) data_size is assigned from the unsigned h95/h100 wire length and drbdd() never bounds it for a payload-carrying command, so a length above INT_MAX casts it negative; this path needs no non-default feature. The bio receive loop then computes expect = min_t(int, data_size, bv_len), which is negative, and drbd_recv_all_warn(mapped, expect) receives with a size_t of SIZE_MAX into the first mapped page. The sibling receive path read_in_block() is not affected: it uses an unsigned size and rejects it against DRBD_MAX_BIO_SIZE before receiving. Reject a data reply whose size is negative after the optional digest subtraction, covering both triggers. Impact: a malicious or man-in-the-middle DRBD peer copies attacker-chosen bytes past a bio page in the receiver, corrupting kernel memory. A node that reads from its peer (a diskless node, or read-balancing to the peer) is exposed in the default configuration; data-integrity-alg is not required.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b411b3637fa71fce9cf2acf0639009500f5892fe , < bca33f5442c3094511719d9db792ce3165d87e76 (git)
Affected: b411b3637fa71fce9cf2acf0639009500f5892fe , < 741a682535deffe9ab7e5c89caf83571efbc9dd9 (git)
Affected: b411b3637fa71fce9cf2acf0639009500f5892fe , < f14e87d7b166490bceb9603b39310e51595d05b9 (git)
Affected: b411b3637fa71fce9cf2acf0639009500f5892fe , < f16866c62656865854106b79bcf6e4ca97a51a92 (git)
Affected: b411b3637fa71fce9cf2acf0639009500f5892fe , < 5f59a8142000f0b8f75c432209ead73c424a745d (git)
Affected: b411b3637fa71fce9cf2acf0639009500f5892fe , < 38cc4867540ae8beedfe41a1a1a6ed37052c77d6 (git)
Affected: b411b3637fa71fce9cf2acf0639009500f5892fe , < 648d4317326e6aa3f8c05cbf0fd14cc2eba6ca99 (git)
Affected: b411b3637fa71fce9cf2acf0639009500f5892fe , < bd910a7660d280595ef94cb6d193951d855d330f (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.33
Unaffected: 0 , < 2.6.33 (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: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrbd: reject data replies with an out-of-range payload size\n\nrecv_dless_read() receives a P_DATA_REPLY from a peer into the bio of an\noutstanding read request. The peer-supplied payload length reaches it as\nthe signed int data_size, and two peer-controlled inputs can make it\nnegative. With a negotiated data-integrity-alg the digest length is\nsubtracted first, so a reply whose payload is smaller than the digest\nunderflows data_size. With no integrity algorithm (the default) data_size\nis assigned from the unsigned h95/h100 wire length and drbdd() never\nbounds it for a payload-carrying command, so a length above INT_MAX casts\nit negative; this path needs no non-default feature. The bio receive loop\nthen computes expect = min_t(int, data_size, bv_len), which is negative,\nand drbd_recv_all_warn(mapped, expect) receives with a size_t of SIZE_MAX\ninto the first mapped page.\n\nThe sibling receive path read_in_block() is not affected: it uses an\nunsigned size and rejects it against DRBD_MAX_BIO_SIZE before receiving.\nReject a data reply whose size is negative after the optional digest\nsubtraction, covering both triggers.\n\nImpact: a malicious or man-in-the-middle DRBD peer copies attacker-chosen\nbytes past a bio page in the receiver, corrupting kernel memory. A node\nthat reads from its peer (a diskless node, or read-balancing to the peer)\nis exposed in the default configuration; data-integrity-alg is not\nrequired."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - Exploitation is delivered over the DRBD replication TCP protocol when a victim node receives a malicious P_DATA_REPLY from its peer or a man-in-the-middle on that link; recv_dless_read() is reached from drbdd() without any local syscall or ioctl on the victim.\nAC:L - The peer fully controls the wire length in the P_DATA_REPLY header, and two independent triggers (unsigned-to-signed overflow or digest subtraction underflow) deterministically force expect negative so drbd_recv_all_warn() receives SIZE_MAX bytes whenever the victim issues a remote read.\nPR:N - No account, capability, or administrative access on the victim host is required; a malicious DRBD peer or network man-in-the-middle on the replication link can send the crafted reply after connection setup, and cram-hmac-alg peer authentication is optional.\nUI:N - No end-user action is needed because diskless-primary and read-balancing configurations automatically send P_DATA_REQUEST packets to the peer, and the malicious P_DATA_REPLY is processed in the kernel receiver thread during normal I/O.\nS:U - The out-of-bounds socket receive corrupts kernel memory on the same host that runs DRBD; successful exploitation yields kernel compromise on that node but does not by itself cross a VM, container, or IOMMU security boundary.\nC:H - Receiving up to SIZE_MAX attacker-controlled bytes past the mapped bio page is an out-of-bounds kernel write that can corrupt adjacent heap or page data and be leveraged for arbitrary kernel memory disclosure, not merely a bounded leak.\nI:H - The bug copies attacker-chosen network data beyond the allocated bio buffer boundary, providing a kernel out-of-bounds write primitive that can corrupt kernel structures and enable arbitrary code execution or privilege escalation.\nA:H - Writing gigabytes past a bio page can immediately corrupt critical kernel memory and cause oops or panic, and repeated malicious replies can keep the node unavailable even before full exploitation."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:39:26.031Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/bca33f5442c3094511719d9db792ce3165d87e76"
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          "url": "https://git.kernel.org/stable/c/741a682535deffe9ab7e5c89caf83571efbc9dd9"
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        },
        {
          "url": "https://git.kernel.org/stable/c/bd910a7660d280595ef94cb6d193951d855d330f"
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      ],
      "title": "drbd: reject data replies with an out-of-range payload size",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72014",
    "datePublished": "2026-08-15T05:51:42.741Z",
    "dateReserved": "2026-08-09T03:40:39.899Z",
    "dateUpdated": "2026-08-17T05:39:26.031Z",
    "state": "PUBLISHED"
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With no integrity algorithm (the default) data_size\\nis assigned from the unsigned h95/h100 wire length and drbdd() never\\nbounds it for a payload-carrying command, so a length above INT_MAX casts\\nit negative; this path needs no non-default feature. The bio receive loop\\nthen computes expect = min_t(int, data_size, bv_len), which is negative,\\nand drbd_recv_all_warn(mapped, expect) receives with a size_t of SIZE_MAX\\ninto the first mapped page.\\n\\nThe sibling receive path read_in_block() is not affected: it uses an\\nunsigned size and rejects it against DRBD_MAX_BIO_SIZE before receiving.\\nReject a data reply whose size is negative after the optional digest\\nsubtraction, covering both triggers.\\n\\nImpact: a malicious or man-in-the-middle DRBD peer copies attacker-chosen\\nbytes past a bio page in the receiver, corrupting kernel memory. A node\\nthat reads from its peer (a diskless node, or read-balancing to the peer)\\nis exposed in the default configuration; data-integrity-alg is not\\nrequired.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/block/drbd/drbd_receiver.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b411b3637fa71fce9cf2acf0639009500f5892fe\",\"lessThan\":\"bca33f5442c3094511719d9db792ce3165d87e76\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b411b3637fa71fce9cf2acf0639009500f5892fe\",\"lessThan\":\"741a682535deffe9ab7e5c89caf83571efbc9dd9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b411b3637fa71fce9cf2acf0639009500f5892fe\",\"lessThan\":\"f14e87d7b166490bceb9603b39310e51595d05b9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b411b3637fa71fce9cf2acf0639009500f5892fe\",\"lessThan\":\"f16866c62656865854106b79bcf6e4ca97a51a92\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b411b3637fa71fce9cf2acf0639009500f5892fe\",\"lessThan\":\"5f59a8142000f0b8f75c432209ead73c424a745d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b411b3637fa71fce9cf2acf0639009500f5892fe\",\"lessThan\":\"38cc4867540ae8beedfe41a1a1a6ed37052c77d6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b411b3637fa71fce9cf2acf0639009500f5892fe\",\"lessThan\":\"648d4317326e6aa3f8c05cbf0fd14cc2eba6ca99\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b411b3637fa71fce9cf2acf0639009500f5892fe\",\"lessThan\":\"bd910a7660d280595ef94cb6d193951d855d330f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/block/drbd/drbd_receiver.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.33\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.33\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/38cc4867540ae8beedfe41a1a1a6ed37052c77d6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5f59a8142000f0b8f75c432209ead73c424a745d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/648d4317326e6aa3f8c05cbf0fd14cc2eba6ca99\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/741a682535deffe9ab7e5c89caf83571efbc9dd9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bca33f5442c3094511719d9db792ce3165d87e76\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bd910a7660d280595ef94cb6d193951d855d330f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f14e87d7b166490bceb9603b39310e51595d05b9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f16866c62656865854106b79bcf6e4ca97a51a92\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T16:05:57+00:00",
      "cve": "CVE-2026-72014",
      "id": "CVE-2026-72014",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drbd: reject data replies with an out-of-range payload size",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72014.json",
      "version": "3"
    }
  }
}



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  • 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.