What’s Vulnerable › Vulnerabilities

CVE-2026-23285: drbd: fix null-pointer dereference on local read error

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-25 · updated 2026-06-17
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: drbd: fix null-pointer dereference on local read error In drbd_request_endio(), READ_COMPLETED_WITH_ERROR is passed to __req_mod() with a NULL peer_device: __req_mod(req, what, NULL, &m); The READ_COMPLETED_WITH_ERROR handler then unconditionally passes this NULL peer_device to drbd_set_out_of_sync(), which dereferences it, causing a null-pointer dereference. Fix this by obtaining the peer_device via first_peer_device(device), matching how drbd_req_destroy() handles the same situation.

Affected products

• Linux kernel: from 6.4 before 6.6.130; from 6.7 before 6.12.77; from 6.13 before 6.18.17; from 6.19 before 6.19.7; 7.0-rc1 — fixed in 6.12.77, 6.18.17, 6.19.7, 6.6.130

How to fix

Upgrade to a fixed version: Linux kernel 6.12.77, 6.18.17, 6.19.7, 6.6.130. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0d195d3b205ca90db30d70d09d7bb6909aac178f
• https://git.kernel.org/stable/c/1e906c08594c8f9a6a524f38ede2c4e051196106
• https://git.kernel.org/stable/c/4e8935053ba389ae8d6685c10854d8021931bd89
• https://git.kernel.org/stable/c/6f1d1614f841d91a4169db65812ffd1271735b42
• https://git.kernel.org/stable/c/91df51d2df0ca4fd3281f73626341563d64a98a5

Get alerted when CVE-2026-23285 or the next vulnerability affects your stack