CVE-2026-99126

Published: October 30, 2026Last modified: October 30, 2026

Description

In the Linux kernel, the following vulnerability has been resolved: s390/ctcm: Prevent XID null dereference The mpc_validate_xid() function sets grp->saved_xid2->xid2_flag2 to 0x40 to signal XID validation error. If peer XID is NULL or r/w channel pairing mismatch happens, grp->saved_xid2 is never initialized. An attempt to set the flag in such case leads to NULL dereference. Fix this by using the always available priv->xid->xid2_flag2 instead of grp->saved_xid2->xid2_flag2 for validation errors.

Status

References

• https://git.kernel.org/stable/c/34fa3607b7604b3052b19cec8b0ad644818cdd2a
• https://git.kernel.org/stable/c/8a2f7a4ad1d81612fa65bfa4d392ba1bb2f5eeab
• https://git.kernel.org/stable/c/b264d8422779d69febce914efc47a92a85cc382c