CVE-2026-80892 is a vulnerability in Linux Kernel
Published on September 4, 2026
erofs: cap LZMA stream pool size
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.
Products Associated with CVE-2026-80892
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Affected Versions
Linux:- Version 622ceaddb7649ca328832f50ba1400af778d75fa and below 682cb3ece37fc5141e73bc726ccf4adb833e5189 is affected.
- Version 622ceaddb7649ca328832f50ba1400af778d75fa and below e8b3d09aa8889dda9be9cbb3d2f0218c4b9acde4 is affected.
- Version 622ceaddb7649ca328832f50ba1400af778d75fa and below 0c676903cb2a61992ded8e7907609cc6b0f11744 is affected.
- Version 622ceaddb7649ca328832f50ba1400af778d75fa and below 5aaa06dfc10f8398c8807453dbec738ea9af10e4 is affected.
- Version 622ceaddb7649ca328832f50ba1400af778d75fa and below e52da169b8c0d19bb2d803f2a07fe0e5a00462d6 is affected.
- Version 622ceaddb7649ca328832f50ba1400af778d75fa and below c9b47e6b23114e939b17f818471c7a46e59006e7 is affected.
- Version 5.16 is affected.
- Before 5.16 is unaffected.
- Version 6.1.184, <= 6.1.* is unaffected.
- Version 6.6.151, <= 6.6.* is unaffected.
- Version 6.12.103, <= 6.12.* is unaffected.
- Version 6.18.44, <= 6.18.* is unaffected.
- Version 7.1.8, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.