drbd: reject data replies with an out-of-range payload size

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72014
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:21:00 UTC
Updated2026-08-17 06:17:58 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.002010000 probability, percentile 0.104110000 (date 2026-08-16)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b411b3637fa71fce9cf2acf0639009500f5892fe bca33f5442c3094511719d9db792ce3165d87e76 git Not specified
CNA Linux Linux affected b411b3637fa71fce9cf2acf0639009500f5892fe 741a682535deffe9ab7e5c89caf83571efbc9dd9 git Not specified
CNA Linux Linux affected b411b3637fa71fce9cf2acf0639009500f5892fe f14e87d7b166490bceb9603b39310e51595d05b9 git Not specified
CNA Linux Linux affected b411b3637fa71fce9cf2acf0639009500f5892fe f16866c62656865854106b79bcf6e4ca97a51a92 git Not specified
CNA Linux Linux affected b411b3637fa71fce9cf2acf0639009500f5892fe 5f59a8142000f0b8f75c432209ead73c424a745d git Not specified
CNA Linux Linux affected b411b3637fa71fce9cf2acf0639009500f5892fe 38cc4867540ae8beedfe41a1a1a6ed37052c77d6 git Not specified
CNA Linux Linux affected b411b3637fa71fce9cf2acf0639009500f5892fe 648d4317326e6aa3f8c05cbf0fd14cc2eba6ca99 git Not specified
CNA Linux Linux affected b411b3637fa71fce9cf2acf0639009500f5892fe bd910a7660d280595ef94cb6d193951d855d330f git Not specified
CNA Linux Linux affected 2.6.33 Not specified
CNA Linux Linux unaffected 2.6.33 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/648d4317326e6aa3f8c05cbf0fd14cc2eba6ca99 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f16866c62656865854106b79bcf6e4ca97a51a92 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/38cc4867540ae8beedfe41a1a1a6ed37052c77d6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bd910a7660d280595ef94cb6d193951d855d330f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f14e87d7b166490bceb9603b39310e51595d05b9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bca33f5442c3094511719d9db792ce3165d87e76 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5f59a8142000f0b8f75c432209ead73c424a745d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/741a682535deffe9ab7e5c89caf83571efbc9dd9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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