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CVE-2026-80809— ocfs2: fix missing metadata reservation for large xattrs

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ocfs2文件系统在文件已有外部xattr块时未预留新xattr值extent树的元数据块，在碎片化文件系统上设置大型xattr值时可能导致内核崩溃。

AI Predicted 4.5 Difficulty: Moderate EPSS 0.19% · P9

Possible ATT&CK Techniques 1 AI

T1531 · Account Access Removal

Affected Version Matrix 22

VendorProduct Version RangeStatus
Linux Linux a78f9f4668949a6588b8872f162e86685c63d023< 743ac908282ac97ef6e73ac3a92df2cc8ecb7479 affected
a78f9f4668949a6588b8872f162e86685c63d023< 04ba24bce61c917b5b3009f0db470cbb72e26a0d affected
a78f9f4668949a6588b8872f162e86685c63d023< b4663405ae29d36011cd712d243456f3f9ab700d affected
a78f9f4668949a6588b8872f162e86685c63d023< 6a009f1e61b11d9e23d3c5aa1dacfb010945da45 affected
a78f9f4668949a6588b8872f162e86685c63d023< b9eb5c9fdd81d82976d4d5be2b2458eb7d7e46ec affected
a78f9f4668949a6588b8872f162e86685c63d023< 6176313622e34fa3e2b66b9d0682d1e1c6b365c5 affected
a78f9f4668949a6588b8872f162e86685c63d023< a3ccb57086dd7652d5ecb826486144198a98a8e9 affected
a78f9f4668949a6588b8872f162e86685c63d023< 50f0cbec45b0f3fd7e1263d01916518dbf31eb3f affected
… +14 more rows
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I. Basic Information for CVE-2026-80809

Vulnerability Information
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Vulnerability Title
ocfs2: fix missing metadata reservation for large xattrs
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix missing metadata reservation for large xattrs [BUG] lsetxattr() panics the kernel when setting a large xattr value on a fragmented filesystem where the file already has an external xattr block. [CAUSE] ocfs2_calc_xattr_set_need() never reserves metadata blocks for a new xattr value's extent tree when the file already has an external xattr block. The not_found path leaves meta_add at zero, so meta_ac is NULL when ocfs2_xattr_extend_allocation() runs. A new value root has room for a single extent record. On a fragmented filesystem, the allocator cannot satisfy the xattr value in one contiguous run, so each non-contiguous run requires its own extent record. When the value root's extent list is full and meta_ac is NULL, ocfs2_add_clusters_in_btree() returns RESTART_META, and ocfs2_xattr_extend_allocation() hits BUG_ON(why == RESTART_META). [FIX] The case where no xattr block exists yet already calls ocfs2_extend_meta_needed(&def_xv.xv.xr_list) to reserve value tree metadata. Add the same reservation to the case where an xattr block already exists, making the two cases consistent. Replace the BUG_ON with a -ENOSPC return so that if RESTART_META is returned despite the reservation, the error propagates to userspace instead of panicking the kernel.
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ocfs2文件系统在文件已有外部xattr块时未预留新xattr值extent树的元数据块，在碎片化文件系统上设置大型xattr值时可能导致内核崩溃。
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 a78f9f4668949a6588b8872f162e86685c63d023 ~ 743ac908282ac97ef6e73ac3a92df2cc8ecb7479 -
Linux Linux 2.6.35 -

II. Public POCs for CVE-2026-80809

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III. Intelligence Information for CVE-2026-80809

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Patches & Fixes for CVE-2026-80809 (8)

Other References for CVE-2026-80809 (1)

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-2026-80809

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