PT-2026-128119
CVE-2026-99126
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Published
2026-10-28
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Updated
2026-10-28
Description by
Score
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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.
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