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CVE-2025-21811— nilfs2: protect access to buffers with no active references

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，该漏洞源于未保护对无活动引用缓冲区的访问，可能导致释放后重用。

CVSS 7.8 · High EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1499.002 · Service Exhaustion Flood

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 8c26c4e2694a163d525976e804d81cd955bbb40c< e1fc4a90a90ea8514246c45435662531975937d9 affected
8c26c4e2694a163d525976e804d81cd955bbb40c< 72cf688d0ce7e642b12ddc9b2a42524737ec1b4a affected
8c26c4e2694a163d525976e804d81cd955bbb40c< d8ff250e085a4c4cdda4ad1cdd234ed110393143 affected
8c26c4e2694a163d525976e804d81cd955bbb40c< 58c27fa7a610b6e8d44e6220e7dbddfbaccaf439 affected
8c26c4e2694a163d525976e804d81cd955bbb40c< 8e1b9201c9a24638cf09c6e1c9f224157328010b affected
8c26c4e2694a163d525976e804d81cd955bbb40c< 4b08d23d7d1917bef4fbee8ad81372f49b006656 affected
8c26c4e2694a163d525976e804d81cd955bbb40c< c437dfac9f7a5a46ac2a5e6d6acd3059e9f68188 affected
8c26c4e2694a163d525976e804d81cd955bbb40c< 367a9bffabe08c04f6d725032cce3d891b2b9e1a affected
… +10 more rows
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I. Basic Information for CVE-2025-21811

Vulnerability Information
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Vulnerability Title
nilfs2: protect access to buffers with no active references
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nilfs2: protect access to buffers with no active references nilfs_lookup_dirty_data_buffers(), which iterates through the buffers attached to dirty data folios/pages, accesses the attached buffers without locking the folios/pages. For data cache, nilfs_clear_folio_dirty() may be called asynchronously when the file system degenerates to read only, so nilfs_lookup_dirty_data_buffers() still has the potential to cause use after free issues when buffers lose the protection of their dirty state midway due to this asynchronous clearing and are unintentionally freed by try_to_free_buffers(). Eliminate this race issue by adjusting the lock section in this function.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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，该漏洞源于未保护对无活动引用缓冲区的访问，可能导致释放后重用。
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 8c26c4e2694a163d525976e804d81cd955bbb40c ~ e1fc4a90a90ea8514246c45435662531975937d9 -
Linux Linux 3.10 -

II. Public POCs for CVE-2025-21811

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III. Intelligence Information for CVE-2025-21811

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Patches & Fixes for CVE-2025-21811 (5)

Other References for CVE-2025-21811 (3)

Same Patch Batch · Linux · 2025-02-27 · 177 CVEs total

CVE-2025-21805 9.8 CRITICAL RDMA/rtrs: Add missing deinit() call
CVE-2025-21796 9.8 CRITICAL nfsd: clear acl_access/acl_default after releasing them
CVE-2025-21707 9.8 CRITICAL mptcp: consolidate suboption status
CVE-2025-21748 9.8 CRITICAL ksmbd: fix integer overflows on 32 bit systems
CVE-2024-58006 9.6 CRITICAL PCI: dwc: ep: Prevent changing BAR size/flags in pci_epc_set_bar()
CVE-2024-57999 8.8 HIGH powerpc/pseries/iommu: IOMMU incorrectly marks MMIO range in DDW
CVE-2025-21735 8.8 HIGH NFC: nci: Add bounds checking in nci_hci_create_pipe()
CVE-2024-57997 8.8 HIGH wifi: wcn36xx: fix channel survey memory allocation size
CVE-2024-57995 8.8 HIGH wifi: ath12k: fix read pointer after free in ath12k_mac_assign_vif_to_vdev()
CVE-2025-21710 8.2 HIGH tcp: correct handling of extreme memory squeeze
CVE-2025-21766 8.1 HIGH ipv4: use RCU protection in __ip_rt_update_pmtu()
CVE-2024-57973 8.1 HIGH rdma/cxgb4: Prevent potential integer overflow on 32bit
CVE-2025-21765 8.1 HIGH ipv6: use RCU protection in ip6_default_advmss()
CVE-2025-21760 8.1 HIGH ndisc: extend RCU protection in ndisc_send_skb()
CVE-2025-21762 8.1 HIGH arp: use RCU protection in arp_xmit()
CVE-2024-58010 7.8 HIGH binfmt_flat: Fix integer overflow bug on 32 bit systems
CVE-2024-58008 7.8 HIGH KEYS: trusted: dcp: fix improper sg use with CONFIG_VMAP_STACK=y
CVE-2025-21764 7.8 HIGH ndisc: use RCU protection in ndisc_alloc_skb()
CVE-2025-21791 7.8 HIGH vrf: use RCU protection in l3mdev_l3_out()
CVE-2025-21763 7.8 HIGH neighbour: use RCU protection in __neigh_notify()

Showing top 20 of 177 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21811

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