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CVE-2026-31455— xfs: stop reclaim before pushing AIL during unmount

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.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于xfs_unmount_flush_inodes函数在卸载时未停止回收就推送AIL，可能导致后台回收和inodegc与AIL推送竞争。

AI Predicted 4.3 Difficulty: Hard EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 90c60e16401248a4900f3f9387f563d0178dcf34< e6cc490048f78b009259a5f032acead9f789c34c affected
90c60e16401248a4900f3f9387f563d0178dcf34< 239d734c00644072862fa833805c4471573b1445 affected
90c60e16401248a4900f3f9387f563d0178dcf34< bda27fc0b4eb3a425d9a18475c4cb94fbe862c60 affected
90c60e16401248a4900f3f9387f563d0178dcf34< d38135af04a3ad8a585c899d176efc8e97853115 affected
90c60e16401248a4900f3f9387f563d0178dcf34< a89434a6188d8430ea31120da96e3e4cefb58686 affected
90c60e16401248a4900f3f9387f563d0178dcf34< 8147e304d7d32fd5c3e943babc296ce2873dc279 affected
90c60e16401248a4900f3f9387f563d0178dcf34< 558e3275d8a3b101be18a7fe7d1634053e9d9b07 affected
90c60e16401248a4900f3f9387f563d0178dcf34< 4f24a767e3d64a5f58c595b5c29b6063a201f1e3 affected
… +10 more rows
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I. Basic Information for CVE-2026-31455

Vulnerability Information
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Vulnerability Title
xfs: stop reclaim before pushing AIL during unmount
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfs: stop reclaim before pushing AIL during unmount The unmount sequence in xfs_unmount_flush_inodes() pushed the AIL while background reclaim and inodegc are still running. This is broken independently of any use-after-free issues - background reclaim and inodegc should not be running while the AIL is being pushed during unmount, as inodegc can dirty and insert inodes into the AIL during the flush, and background reclaim can race to abort and free dirty inodes. Reorder xfs_unmount_flush_inodes() to stop inodegc and cancel background reclaim before pushing the AIL. Stop inodegc before cancelling m_reclaim_work because the inodegc worker can re-queue m_reclaim_work via xfs_inodegc_set_reclaimable.
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于xfs_unmount_flush_inodes函数在卸载时未停止回收就推送AIL，可能导致后台回收和inodegc与AIL推送竞争。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 90c60e16401248a4900f3f9387f563d0178dcf34 ~ e6cc490048f78b009259a5f032acead9f789c34c -
Linux Linux 5.9 -

II. Public POCs for CVE-2026-31455

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III. Intelligence Information for CVE-2026-31455

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Same Patch Batch · Linux · 2026-04-22 · 100 CVEs total

CVE-2026-31478 9.8 CRITICAL ksmbd: replace hardcoded hdr2_len with offsetof() in smb2_calc_max_out_buf_len()
CVE-2026-31463 9.8 CRITICAL iomap: fix invalid folio access when i_blkbits differs from I/O granularity
CVE-2026-31444 9.8 CRITICAL ksmbd: fix use-after-free and NULL deref in smb_grant_oplock()
CVE-2026-31436 9.8 CRITICAL dmaengine: idxd: fix possible wrong descriptor completion in llist_abort_desc()
CVE-2026-31501 9.8 CRITICAL net: ti: icssg-prueth: fix use-after-free of CPPI descriptor in RX path
CVE-2026-31448 9.4 CRITICAL ext4: avoid infinite loops caused by residual data
CVE-2026-31450 8.8 HIGH ext4: publish jinode after initialization
CVE-2026-31432 8.8 HIGH ksmbd: fix OOB write in QUERY_INFO for compound requests
CVE-2026-31433 8.8 HIGH ksmbd: fix potencial OOB in get_file_all_info() for compound requests
CVE-2026-31435 8.8 HIGH netfs: Fix read abandonment during retry
CVE-2026-31476 8.2 HIGH ksmbd: do not expire session on binding failure
CVE-2026-31464 8.1 HIGH scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()
CVE-2026-31513 8.1 HIGH Bluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req
CVE-2026-31488 7.8 HIGH drm/amd/display: Do not skip unrelated mode changes in DSC validation
CVE-2026-31494 7.8 HIGH net: macb: use the current queue number for stats
CVE-2026-31454 7.8 HIGH xfs: save ailp before dropping the AIL lock in push callbacks
CVE-2026-31502 7.8 HIGH team: fix header_ops type confusion with non-Ethernet ports
CVE-2026-31479 7.8 HIGH drm/xe: always keep track of remap prev/next
CVE-2026-31504 7.8 HIGH net: fix fanout UAF in packet_release() via NETDEV_UP race
CVE-2026-31505 7.8 HIGH iavf: fix out-of-bounds writes in iavf_get_ethtool_stats()

Showing top 20 of 100 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31455

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