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CVE-2025-21736— nilfs2: fix possible int overflows in nilfs_fiemap()

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nilfs_fiemap函数中可能存在整数溢出，导致越界读取。

AI Predicted 5.5 Difficulty: Theoretical EPSS 0.25% · P16

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 622daaff0a8975fb5c5b95f24f3234550ba32e92< 7649937987fed51ed09985da4019d50189fc534e affected
622daaff0a8975fb5c5b95f24f3234550ba32e92< 58b1c6881081f5ddfb9a14dc241a74732c0f855c affected
622daaff0a8975fb5c5b95f24f3234550ba32e92< 8f41df5fd4c11d26e929a85f7239799641f92da7 affected
622daaff0a8975fb5c5b95f24f3234550ba32e92< f3d80f34f58445355fa27b9579a449fb186aa64e affected
622daaff0a8975fb5c5b95f24f3234550ba32e92< f2bd0f1ab47822fe5bd699c8458b896c4b2edea1 affected
622daaff0a8975fb5c5b95f24f3234550ba32e92< b9495a9109abc31d3170f7aad7d48aa64610a1a2 affected
622daaff0a8975fb5c5b95f24f3234550ba32e92< 250423300b4b0335918be187ef3cade248c06e6a affected
622daaff0a8975fb5c5b95f24f3234550ba32e92< 6438ef381c183444f7f9d1de18f22661cba1e946 affected
… +10 more rows
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I. Basic Information for CVE-2025-21736

Vulnerability Information
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Vulnerability Title
nilfs2: fix possible int overflows in nilfs_fiemap()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix possible int overflows in nilfs_fiemap() Since nilfs_bmap_lookup_contig() in nilfs_fiemap() calculates its result by being prepared to go through potentially maxblocks == INT_MAX blocks, the value in n may experience an overflow caused by left shift of blkbits. While it is extremely unlikely to occur, play it safe and cast right hand expression to wider type to mitigate the issue. Found by Linux Verification Center (linuxtesting.org) with static analysis tool SVACE.
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nilfs_fiemap函数中可能存在整数溢出，导致越界读取。
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 622daaff0a8975fb5c5b95f24f3234550ba32e92 ~ 7649937987fed51ed09985da4019d50189fc534e -
Linux Linux 2.6.38 -

II. Public POCs for CVE-2025-21736

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III. Intelligence Information for CVE-2025-21736

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Patches & Fixes for CVE-2025-21736 (5)

Other References for CVE-2025-21736 (3)

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

CVE-2025-21796 9.8 CRITICAL nfsd: clear acl_access/acl_default after releasing them
CVE-2025-21805 9.8 CRITICAL RDMA/rtrs: Add missing deinit() call
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-2025-21735 8.8 HIGH NFC: nci: Add bounds checking in nci_hci_create_pipe()
CVE-2024-57999 8.8 HIGH powerpc/pseries/iommu: IOMMU incorrectly marks MMIO range in DDW
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-2024-57973 8.1 HIGH rdma/cxgb4: Prevent potential integer overflow on 32bit
CVE-2025-21760 8.1 HIGH ndisc: extend RCU protection in ndisc_send_skb()
CVE-2025-21766 8.1 HIGH ipv4: use RCU protection in __ip_rt_update_pmtu()
CVE-2025-21765 8.1 HIGH ipv6: use RCU protection in ip6_default_advmss()
CVE-2025-21762 8.1 HIGH arp: use RCU protection in arp_xmit()
CVE-2025-21730 7.8 HIGH wifi: rtw89: avoid to init mgnt_entry list twice when WoWLAN failed
CVE-2025-21729 7.8 HIGH wifi: rtw89: fix race between cancel_hw_scan and hw_scan completion
CVE-2025-21772 7.8 HIGH partitions: mac: fix handling of bogus partition table
CVE-2024-52560 7.8 HIGH fs/ntfs3: Mark inode as bad as soon as error detected in mi_enum_attr()
CVE-2024-58002 7.8 HIGH media: uvcvideo: Remove dangling pointers

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-2025-21736

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