{"cve":"CVE-2026-80892","nvd":{"published":"2026-09-04T18:17:57.337","modified":"2026-09-04T18:17:57.337","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: cap LZMA stream pool size\n\nfs/erofs/decompressor_lzma.c sizes the module-global MicroLZMA stream\npool from num_possible_cpus() when the lzma_streams module parameter is\nunset, then z_erofs_load_lzma_config() preallocates one image-supplied\ndictionary per stream, accepting dictionaries up to 8 MiB.  On high-CPU\nsystems, a small EROFS image can pin hundreds of MiB of vmalloc-backed\ndecoder state until the erofs module is unloaded.\n\nImpact: An EROFS image mounted by the system can pin up to 8 MiB of\nvmalloc memory per LZMA stream, either as intended or unexpectedly.\n\nBound the default stream count by a new\nCONFIG_EROFS_FS_ZIP_LZMA_DEFAULT_MAX_STREAMS option, default 16, so the\nworst-case default preallocation is 128 MiB if the number of CPUs is no\nless than 16 while preserving the existing per-image dictionary limit.\nAn explicit lzma_streams module parameter is still honoured as-is, so\nadministrators who deliberately size the pool are not affected.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/0c676903cb2a61992ded8e7907609cc6b0f11744","https://git.kernel.org/stable/c/5aaa06dfc10f8398c8807453dbec738ea9af10e4","https://git.kernel.org/stable/c/682cb3ece37fc5141e73bc726ccf4adb833e5189","https://git.kernel.org/stable/c/c9b47e6b23114e939b17f818471c7a46e59006e7","https://git.kernel.org/stable/c/e52da169b8c0d19bb2d803f2a07fe0e5a00462d6"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:52:03.409947763+00:00"},"epss":{"cve":"CVE-2026-80892","score":0.00173,"percentile":0.06655,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}