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CVE-2026-80892— erofs: cap LZMA stream pool size

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erofs文件系统未设置lzma_streams参数时，fs/erofs/decompressor_lzma.c根据CPU数量确定MicroLZMA流池大小，并为每个流预分配高达8 MiB的字典，导致高CPU系统上挂载EROFS镜像可固定大量vmalloc内存，可能造成拒绝服务。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.17% · P7

Possible ATT&CK Techniques 1 AI

T1027 · Obfuscated Files or Information

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 622ceaddb7649ca328832f50ba1400af778d75fa< 682cb3ece37fc5141e73bc726ccf4adb833e5189 affected
622ceaddb7649ca328832f50ba1400af778d75fa< e8b3d09aa8889dda9be9cbb3d2f0218c4b9acde4 affected
622ceaddb7649ca328832f50ba1400af778d75fa< 0c676903cb2a61992ded8e7907609cc6b0f11744 affected
622ceaddb7649ca328832f50ba1400af778d75fa< 5aaa06dfc10f8398c8807453dbec738ea9af10e4 affected
622ceaddb7649ca328832f50ba1400af778d75fa< e52da169b8c0d19bb2d803f2a07fe0e5a00462d6 affected
622ceaddb7649ca328832f50ba1400af778d75fa< c9b47e6b23114e939b17f818471c7a46e59006e7 affected
5.16 affected
< 5.16 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-80892

Vulnerability Information
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Vulnerability Title
erofs: cap LZMA stream pool size
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: erofs: cap LZMA stream pool size fs/erofs/decompressor_lzma.c sizes the module-global MicroLZMA stream pool from num_possible_cpus() when the lzma_streams module parameter is unset, then z_erofs_load_lzma_config() preallocates one image-supplied dictionary per stream, accepting dictionaries up to 8 MiB. On high-CPU systems, a small EROFS image can pin hundreds of MiB of vmalloc-backed decoder state until the erofs module is unloaded. Impact: An EROFS image mounted by the system can pin up to 8 MiB of vmalloc memory per LZMA stream, either as intended or unexpectedly. Bound the default stream count by a new CONFIG_EROFS_FS_ZIP_LZMA_DEFAULT_MAX_STREAMS option, default 16, so the worst-case default preallocation is 128 MiB if the number of CPUs is no less than 16 while preserving the existing per-image dictionary limit. An explicit lzma_streams module parameter is still honoured as-is, so administrators who deliberately size the pool are not affected.
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erofs文件系统未设置lzma_streams参数时，fs/erofs/decompressor_lzma.c根据CPU数量确定MicroLZMA流池大小，并为每个流预分配高达8 MiB的字典，导致高CPU系统上挂载EROFS镜像可固定大量vmalloc内存，可能造成拒绝服务。
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 622ceaddb7649ca328832f50ba1400af778d75fa ~ 682cb3ece37fc5141e73bc726ccf4adb833e5189 -
Linux Linux 5.16 -

II. Public POCs for CVE-2026-80892

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III. Intelligence Information for CVE-2026-80892

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Patches & Fixes for CVE-2026-80892 (6)

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

CVE-2026-80864 RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
CVE-2026-80855 fuse: fix invalidate lock leak on open O_TRUNC DAX failure
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-2026-80869 ntfs: bound the attribute-list entry in ntfs_read_inode_mount()
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-2026-80870 drm/amdkfd: Validate CRIU-restored IDs before idr_alloc
CVE-2026-80867 alpha/PCI: Add security_locked_down() check to pci_mmap_resource()
CVE-2026-80865 bpf: Add missing access_ok call to copy_user_syms
CVE-2026-80866 tipc: avoid busy looping in tipc_exit_net()
CVE-2026-80854 usb: gadget: f_tcm: keep port count until LUN teardown completes
CVE-2026-80868 ntfs3: Allocate iomap inline_data using alloc_page

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-2026-80892

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