CVE-2026-80892erofs: cap LZMA stream pool size
- —Not scoredno CVSS score yet
- 0.17%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 9 days later
· 9 days later
Published
- 2 months later
· 2 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.17% · top 93% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 622ceaddb7649ca328832f50ba1400af778d75fa – < 682cb3ece37fc5141e73bc726ccf4adb833e5189
- affected 622ceaddb7649ca328832f50ba1400af778d75fa – < e8b3d09aa8889dda9be9cbb3d2f0218c4b9acde4
- affected 622ceaddb7649ca328832f50ba1400af778d75fa – < 0c676903cb2a61992ded8e7907609cc6b0f11744
- affected 622ceaddb7649ca328832f50ba1400af778d75fa – < 5aaa06dfc10f8398c8807453dbec738ea9af10e4
- affected 622ceaddb7649ca328832f50ba1400af778d75fa – < e52da169b8c0d19bb2d803f2a07fe0e5a00462d6
- affected 622ceaddb7649ca328832f50ba1400af778d75fa – < c9b47e6b23114e939b17f818471c7a46e59006e7
- affected 5.16
- unaffected < 5.16
- unaffected 6.1.184 – ≤ 6.1.*
- unaffected 6.6.151 – ≤ 6.6.*
- unaffected 6.12.103 – ≤ 6.12.*
- unaffected 6.18.44 – ≤ 6.18.*
- unaffected 7.1.8 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References6
- https://git.kernel.org/stable/c/682cb3ece37fc5141e73bc726ccf4adb833e5189 (opens in a new tab)
- https://git.kernel.org/stable/c/e8b3d09aa8889dda9be9cbb3d2f0218c4b9acde4 (opens in a new tab)
- https://git.kernel.org/stable/c/0c676903cb2a61992ded8e7907609cc6b0f11744 (opens in a new tab)
- https://git.kernel.org/stable/c/5aaa06dfc10f8398c8807453dbec738ea9af10e4 (opens in a new tab)
- https://git.kernel.org/stable/c/e52da169b8c0d19bb2d803f2a07fe0e5a00462d6 (opens in a new tab)
- https://git.kernel.org/stable/c/c9b47e6b23114e939b17f818471c7a46e59006e7 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-71642 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-80892)Record last updated .