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CVE-2026-98443— xfs: fix cursor and pointer handling when recovering iunlink buckets

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，以下漏洞已被修复： xfs：修复在恢复 iunlink 桶时的游标和指针处理问题 LOLLM 指出了函数中的一个缺陷： 1. 在释放后，未将其置为 NULL。如果循环内的 inodegc 刷新调用失败，可能导致释放后使用（Use-After-Free, UAF）问题。在此基础上，我进一步发现了更多问题： 2. 如果循环内的 inodegc 刷新失败，还会导致发生内存泄漏。 3. 在已经递增之后，才将设置为，这会导致某些 inodes 的字段指向自身。 4. 如果在循环末尾退出

CVSS 7.8 · High EPSS 0.14% · P3 Updated Oct 24, 2026

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 12

Vendor	Product	Version Range	Status
Linux	Linux	`04755d2e5821b3afbaadd09fe5df58d04de36484< 47a948ba653a463d429e02fda2f06a3d6b78666d`	affected
		`04755d2e5821b3afbaadd09fe5df58d04de36484< 8c9d5b8a96d6b93eb24e07b4163c89341ba29bd1`	affected
		`04755d2e5821b3afbaadd09fe5df58d04de36484< 66a2179d02668f8df44b1a249899006f3ba38ea0`	affected
		`04755d2e5821b3afbaadd09fe5df58d04de36484< 961c717e6bf0e53c2c2b1fe4aef1add9390fedab`	affected
		`04755d2e5821b3afbaadd09fe5df58d04de36484< 65f39d09d73718611cee40399179323b5d4ead00`	affected
		`6.0`	affected
		`< 6.0`	unaffected
		`6.6.160≤ 6.6.*`	unaffected
… +4 more rows

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Vulnerability Information

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Vulnerability Title

xfs: fix cursor and pointer handling when recovering iunlink buckets

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: xfs: fix cursor and pointer handling when recovering iunlink buckets LOLLM pointed out a bug in xlog_recover_iunlink_bucket: 1. We don't null out prev_ip after releasing it, which can lead to UAF problems if the inodegc flush call in the loop fails. at which point I noticed even more bugs: 2. If the inodegc flush inside the loop fails, we also leak @ip. 3. We set prev_agino to agino having already advanced agino, which results in inodes with i_prev_unlinked set to itself. 4. If we exit the bottom of the loop with prev_ip set, then prev_ip aliases ip and we also set its i_prev_unlinked to itself. Bugs 3 and 4 introduce loops into the unlinked list, though these loops don't surface because we immediately flush each unlinked inode after loading it. Fix all of these issues.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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	04755d2e5821b3afbaadd09fe5df58d04de36484 ~ 47a948ba653a463d429e02fda2f06a3d6b78666d	-
Linux	Linux	6.0	-

II. Public POCs for CVE-2026-98443

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-98443

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Patches & Fixes for CVE-2026-98443 (3)

https://www.cve.org/CVERecord?id=CVE-2026-98443

Same Patch Batch · Linux · 2026-10-18 · 435 CVEs total

CVE-2026-98548	9.8 CRITICAL	sctp: discard the rest of the packet on a stale-cookie error
CVE-2026-98490	9.8 CRITICAL	net: openvswitch: conntrack: fix helper UAF due to extensions realloc
CVE-2026-98464	9.3 CRITICAL	RISC-V: KVM: Synchronize hrtimer callback during teardown
CVE-2026-98549	9.1 CRITICAL	tcp: prevent collapsing skbs across boundary in rtx queue
CVE-2026-98451	8.8 HIGH	smb: client: use finish_no_open() for non-regular inodes
CVE-2026-98466	8.2 HIGH	KVM: arm64: Transfer the hyp stack pages out of the host stage-2
CVE-2026-98532	8.1 HIGH	ipv6: do not let ipv6_find_hdr() return an offset past the packet end
CVE-2026-98499	8.1 HIGH	HID: wacom: fix OOB read in wacom_wac_pen_serial_enforce()
CVE-2026-98454	8.1 HIGH	smb: client: fix create context out-of-bounds reads
CVE-2026-98524	7.8 HIGH	rds: ib: Clear the sg list when mapping an MR fails
CVE-2026-98520	7.8 HIGH	drm/amdkfd: fix use-after-free and multi-container gap in kfd_dev_mapping
CVE-2026-98491	7.8 HIGH	net: openvswitch: conntrack: avoid modifying shared unconfirmed ct entry
CVE-2026-98507	7.8 HIGH	mm/rmap: fix missing barrier between anon_vma init and vma->anon_vma publish
CVE-2026-98436	7.8 HIGH	accel/amdxdna: Disable device buffer exporting
CVE-2026-98510	7.8 HIGH	drm/xe/vm: nuke PTs only after unlinking contested VMAs
CVE-2026-98515	7.8 HIGH	drm/nouveau: fix double-free in nvif_vmm_dtor
CVE-2026-98487	7.8 HIGH	net: bridge: mdb: restart port group walk after deletion
CVE-2026-98517	7.8 HIGH	drm/nouveau/uvmm: fix UAF in nouveau_uvmm_sm when BO is in TTM_PL_SYSTEM
CVE-2026-98442	7.8 HIGH	net/sched: act_ct: fix helper UAF due to extensions realloc
CVE-2026-98441	7.8 HIGH	net/sched: act_ct: avoid modifying shared unconfirmed ct entry

Showing top 20 of 435 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux

Same vendor: Linux