CVE-2026-23285

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux0d11f3cf279c5ad20a41f29242f170ba3c02f2da < 6f1d1614f841d91a4169db65812ffd1271735b42affected
LinuxLinux0d11f3cf279c5ad20a41f29242f170ba3c02f2da < 1e906c08594c8f9a6a524f38ede2c4e051196106affected
LinuxLinux0d11f3cf279c5ad20a41f29242f170ba3c02f2da < 4e8935053ba389ae8d6685c10854d8021931bd89affected
LinuxLinux0d11f3cf279c5ad20a41f29242f170ba3c02f2da < 91df51d2df0ca4fd3281f73626341563d64a98a5affected
LinuxLinux0d11f3cf279c5ad20a41f29242f170ba3c02f2da < 0d195d3b205ca90db30d70d09d7bb6909aac178faffected
LinuxLinux6.4affected
LinuxLinux0 < 6.4unaffected
LinuxLinux6.6.130 <= 6.6.*unaffected
LinuxLinux6.12.77 <= 6.12.*unaffected
LinuxLinux6.18.17 <= 6.18.*unaffected
LinuxLinux6.19.7 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References