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CVE-2026-80807— nilfs2: reject invalid block index in GC ioctl

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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于nilfs2 GC ioctl未对nilfs_vdesc结构中的vd_offset和vd_vblocknr参数进行范围检查，可能导致页面索引为ULONG_MAX的页面被插入页缓存，进而引发列表破坏。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 7942b919f7321f95a777d396ff7894a7a83dc9b0< 898404cdf882d7b54f1132f75570984ca3214796 affected
7942b919f7321f95a777d396ff7894a7a83dc9b0< ba8a8b563a28d358c45c62a306d421434a058648 affected
7942b919f7321f95a777d396ff7894a7a83dc9b0< 3bd064ccc70b85f9a3d53aece29dc8473be5a226 affected
7942b919f7321f95a777d396ff7894a7a83dc9b0< a5e776e2937581d67ec5b9b4d27b0f70d7baa6b1 affected
7942b919f7321f95a777d396ff7894a7a83dc9b0< 68aa9ab6f8f2895713aa6ddf781463ed8ea5ba44 affected
7942b919f7321f95a777d396ff7894a7a83dc9b0< e447f7edb99bd00cec63d6f3049e2e5074946f71 affected
7942b919f7321f95a777d396ff7894a7a83dc9b0< ec6ddf271dfa4c7e3147bc2c8b2bad4315f316a1 affected
7942b919f7321f95a777d396ff7894a7a83dc9b0< fbcfb75c20d71a5b542ad4ac3b79d10b997c8152 affected
… +12 more rows
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I. Basic Information for CVE-2026-80807

Vulnerability Information
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Vulnerability Title
nilfs2: reject invalid block index in GC ioctl
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nilfs2: reject invalid block index in GC ioctl Syzbot reported list corruption caused by a double list_add_tail() call on bh->b_assoc_buffers within nilfs_lookup_dirty_data_buffers(). Analysis revealed that the root cause was the insertion of a page/folio with a page index of ULONG_MAX into the page cache via the GC ioctl. filemap_get_folios_tag(), called by nilfs_lookup_dirty_data_buffers(), repeatedly detects a dirty folio with a page index of ULONG_MAX due to index wrap-around, leading to duplicate processing of dirty buffers. As a preparatory step, the GC ioctl loads the page/folio of the block to be moved during GC and inserts it into the page cache based on information in the nilfs_vdesc structure passed as an argument. Normally, this does not cause issues because the user-space GC library configures the nilfs_vdesc structure properly. However, since there is no range check on the parameters determining the page index, a request with artificially crafted parameters -- such as those generated by Syzbot -- can result in a page/folio being inserted with a page index of ULONG_MAX, triggering the above problem. This resolves the issue by checking the ranges of 'vd_offset' and 'vd_vblocknr' in the nilfs_vdesc structure that determine the page index, thereby preventing the invalid page/folio insertions.
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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于nilfs2 GC ioctl未对nilfs_vdesc结构中的vd_offset和vd_vblocknr参数进行范围检查，可能导致页面索引为ULONG_MAX的页面被插入页缓存，进而引发列表破坏。
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 7942b919f7321f95a777d396ff7894a7a83dc9b0 ~ 898404cdf882d7b54f1132f75570984ca3214796 -
Linux Linux 2.6.30 -

II. Public POCs for CVE-2026-80807

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III. Intelligence Information for CVE-2026-80807

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Patches & Fixes for CVE-2026-80807 (9)

Same Patch Batch · Linux · 2026-09-04 · 156 CVEs total

CVE-2026-80865 bpf: Add missing access_ok call to copy_user_syms
CVE-2026-80856 fuse: fix invalidate lock leak on setattr writeback failure
CVE-2026-80857 fuse: wait for FR_FINISHED on abort_on_kill to prevent use-after-free
CVE-2026-80858 fuse: publish io-uring queues with release semantics
CVE-2026-80859 fuse: fix missing barrier when checking io-uring readiness
CVE-2026-80860 fuse: fix race between interrupt and resend
CVE-2026-80861 usb: xhci: bail out of setup if the controller is inaccessible
CVE-2026-80862 nvme-tcp: fix usage of page_frag_cache
CVE-2026-80863 RDMA/rxe: Fix OOB in free_rd_atomic_resources()
CVE-2026-80864 RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
CVE-2026-80870 drm/amdkfd: Validate CRIU-restored IDs before idr_alloc
CVE-2026-80874 arm64: dts: renesas: ironhide: Describe inline ECC carveouts
CVE-2026-80873 KVM: arm64: nv: Write ESR_EL2 for injected nested SError exceptions
CVE-2026-80872 ALSA: hda/tas2781: Cancel async firmware request at unbind
CVE-2026-80871 crypto: xilinx-trng - Remove crypto_rng interface
CVE-2026-80868 ntfs3: Allocate iomap inline_data using alloc_page
CVE-2026-80866 tipc: avoid busy looping in tipc_exit_net()
CVE-2026-80867 alpha/PCI: Add security_locked_down() check to pci_mmap_resource()
CVE-2026-80855 fuse: fix invalidate lock leak on open O_TRUNC DAX failure
CVE-2026-80869 ntfs: bound the attribute-list entry in ntfs_read_inode_mount()

Showing top 20 of 156 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80807

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