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CVE-2026-99007— drm/fb-helper: defer setup when fbdev_probe() fails, not just on -EAGAIN

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： drm/fb-helper：当失败时，不仅针对错误，还应延迟初始化配置。函数首先调用，该函数会为每个已连接的输出设备填充和；随后才调用来创建对象，并通过将其绑定到上述中。如果因非的错误（例如本身失败）而返回失败，则函数会在执行之前退出，且不会设置标志。这导致客户端遗留的虽然包含有效的和，但为，且没有任何标记表明该需要重试。函数仅在被设置时才会跳过提交操作。因此，后续的调用（在此案例中是进程退出时触发的）会通过 → →

AI Predicted 5.5 Difficulty: Moderate EPSS 0.17% · P6 Updated Oct 23, 2026

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 12

Vendor	Product	Version Range	Status
Linux	Linux	`ca91a2758fcef6635626993557dd51cfbb6dd134< 4a2006c675758f0c765b36fec6b49d17e89159cf`	affected
		`ca91a2758fcef6635626993557dd51cfbb6dd134< 3b303696f61461b3569019d7fcac6a646652b2b4`	affected
		`ca91a2758fcef6635626993557dd51cfbb6dd134< 4e7b508c7c60dec7a86b7eb2a1b7e6d174afa457`	affected
		`ca91a2758fcef6635626993557dd51cfbb6dd134< d510ed273854177f0a3ed330145858b2fe667f81`	affected
		`ca91a2758fcef6635626993557dd51cfbb6dd134< 755c94d178b7e972bb766199d34e4ba4f63a89eb`	affected
		`4.14`	affected
		`< 4.14`	unaffected
		`6.6.160≤ 6.6.*`	unaffected
… +4 more rows

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Vulnerability Information

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Vulnerability Title

drm/fb-helper: defer setup when fbdev_probe() fails, not just on -EAGAIN

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: drm/fb-helper: defer setup when fbdev_probe() fails, not just on -EAGAIN __drm_fb_helper_initial_config_and_unlock() calls drm_client_modeset_probe() first, which already fills in each mode_set->mode/num_connectors for every connected output, and only afterwards calls drm_fb_helper_single_fb_probe() to create fb_helper->fb and wire it into those mode_sets via drm_setup_crtcs_fb(). If drm_fb_helper_single_fb_probe() fails with anything other than -EAGAIN (e.g. dev->driver->fbdev_probe() itself fails), the function bails out before drm_setup_crtcs_fb() runs and before setting fb_helper->deferred_setup. The client is left with mode_sets that have a mode and connectors but mode_set->fb == NULL, and nothing marks this fb_helper as needing a retry. __drm_fb_helper_restore_fbdev_mode_unlocked() only skips committing when fb_helper->deferred_setup is set, so a later .restore() call (drm_lastclose() on process exit, in this report) commits the stale mode_set through drm_client_modeset_commit() -> drm_client_modeset_commit_atomic() -> __drm_atomic_helper_set_config(), which hits WARN_ON(!set->fb). Mark fb_helper->deferred_setup on any drm_fb_helper_single_fb_probe() failure, not just -EAGAIN, so restore keeps skipping the commit until a later hotplug event successfully re-probes and re-populates mode_set->fb. The real error code is still returned to the caller unchanged.

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	ca91a2758fcef6635626993557dd51cfbb6dd134 ~ 4a2006c675758f0c765b36fec6b49d17e89159cf	-
Linux	Linux	4.14	-

II. Public POCs for CVE-2026-99007

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-99007

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Patches & Fixes for CVE-2026-99007 (4)

https://www.cve.org/CVERecord?id=CVE-2026-99007

Same Patch Batch · Linux · 2026-10-23 · 217 CVEs total

CVE-2026-98959	9.8 CRITICAL	btrfs: fix xattr replace when multiple xattrs are packed in the same item
CVE-2026-99078	9.8 CRITICAL	net/mlx5e: Prevent stale XSK buffer release on MPWQE refill retry
CVE-2026-99079	9.8 CRITICAL	net/mlx5e: Prevent stale XSK buffer release on refill retry
CVE-2026-98988	8.8 HIGH	namespace: keep covered mounts covered in OPEN_TREE_NAMESPACE
CVE-2026-99083	8.8 HIGH	ksmbd: fix heap out-of-bounds write in krb5_authenticate()
CVE-2026-99082	8.8 HIGH	KVM: x86: Use active memslots for the per-vCPU MMIO cache
CVE-2026-98870	8.8 HIGH	ksmbd: remove stale channels from all sessions on teardown
CVE-2026-98980	8.8 HIGH	namei: don't reveal overmounted entries in refwalk
CVE-2026-98981	8.8 HIGH	namespace: unhash a dentry before detaching the mounts on it
CVE-2026-99042	8.4 HIGH	io_uring/net: populate CONNECT filter fields for 24-byte sockaddr_in6
CVE-2026-98978	8.4 HIGH	namespace: never expire a locked mount
CVE-2026-99064	8.1 HIGH	cipso: adjust cached option offsets when removing CIPSO
CVE-2026-98968	8.1 HIGH	amt: send the relay's General Query directly from the receive path
CVE-2026-98993	7.8 HIGH	namespace: don't inherit MNT_UMOUNT in clone_mnt()
CVE-2026-99053	7.8 HIGH	tipc: hold a reference to nodes found by link name
CVE-2026-99054	7.8 HIGH	tipc: destroy topsrv workqueues before closing connections
CVE-2026-99056	7.8 HIGH	strparser: make sure __strp_recv isn't running before tearing down the parser
CVE-2026-99002	7.8 HIGH	drm/vmwgfx: validate pitch coming from userspace
CVE-2026-98899	7.8 HIGH	netfilter: ipset: mark the rcu locked areas properly
CVE-2026-99014	7.8 HIGH	Bluetooth: hci_sync: Fix command skb lifetime during scan setup

Showing top 20 of 217 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

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Same vendor: Linux