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CVE-2026-99126— s390/ctcm: Prevent XID null dereference

Quick assessment

Affected

Linux Linux

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： s390/ctcm：防止 XID 空指针解引用函数会将设置为，以指示 XID 验证错误。如果对端 XID 为 NULL，或发生读写通道配对不匹配的情况，将不会被初始化。在这种情况下尝试设置该标志会导致空指针解引用。修复方法是：在出现验证错误时，使用始终可用的，而不是。

AI Predicted 7.8 Difficulty: Moderate Updated Oct 28, 2026

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 8

Vendor	Product	Version Range	Status
Linux	Linux	`293d984f0e3604c04dcdbf00117ddc1e5d4b1909< 34fa3607b7604b3052b19cec8b0ad644818cdd2a`	affected
		`293d984f0e3604c04dcdbf00117ddc1e5d4b1909< 8a2f7a4ad1d81612fa65bfa4d392ba1bb2f5eeab`	affected
		`293d984f0e3604c04dcdbf00117ddc1e5d4b1909< b264d8422779d69febce914efc47a92a85cc382c`	affected
		`2.6.26`	affected
		`< 2.6.26`	unaffected
		`6.18.59≤ 6.18.*`	unaffected
		`7.2.13≤ 7.2.*`	unaffected
		`7.3≤ *`	unaffected

Updated Oct 28, 2026

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Vulnerability Information

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Vulnerability Title

s390/ctcm: Prevent XID null dereference

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

N/A

Source: CVE Program / CVE List V5

Vulnerability Type

N/A

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Linux	Linux	293d984f0e3604c04dcdbf00117ddc1e5d4b1909 ~ 34fa3607b7604b3052b19cec8b0ad644818cdd2a	-
Linux	Linux	2.6.26	-

II. Public POCs for CVE-2026-99126

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-99126

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Patches & Fixes for CVE-2026-99126 (2)

https://www.cve.org/CVERecord?id=CVE-2026-99126

Same Patch Batch · Linux · 2026-10-28 · 117 CVEs total

CVE-2026-99144		sched_ext: Fix use-after-free of a destroyed user DSQ by a deferred reenqueue
CVE-2026-99130		io_uring/cancel: don't spin on local work the task can't run
CVE-2026-99131		xfs: fix capability check in xfs
CVE-2026-99133		net/iucv: fix the recvmsg window update
CVE-2026-99132		xfs: don't hold buffer locks across sync transaction commit in xfs_sync_sb_buf
CVE-2026-99134		mac802154: fix data race and NULL deref on local->assoc_dev
CVE-2026-99135		dm-integrity: fix infinite loop on discard with large tag size
CVE-2026-99137		cifs: don't update i_size in cifs_do_truncate without a cached handle
CVE-2026-99136		dm-crypt: fix a tiny race condition in crypt_dec_pending
CVE-2026-99138		tcp: fix use-after-free in do_tcp_getsockopt(TCP_CC_INFO)
CVE-2026-99140		tracing: Fix hist trigger timestamps for buffered events
CVE-2026-99139		tcp: fix use-after-free in do_tcp_getsockopt(TCP_CONGESTION)
CVE-2026-99141		tracing: Fix crash in print_graph_function_event()
CVE-2026-99142		tracing: Check operator stack capacity before pushing
CVE-2026-99143		tracing: Keep the predicate limit separate from program capacity
CVE-2026-99156		scsi: st: Fix use-after-free race between st_remove() and st_open()
CVE-2026-99153		scsi: libiscsi: Validate the ITT reflected in a Reject PDU
CVE-2026-99152		scsi: libiscsi: Validate the task named by a management response
CVE-2026-99154		scsi: libiscsi: Reject a negative task index from parse_pdu_itt
CVE-2026-99151		drm/amd/display: Fix NULL sink dereference in USB4 bandwidth functions

Showing top 20 of 117 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

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