CVE-2026-80718
CVE CVE-2026-80718EUVD EUVD-2026-67453Published 2026-08-28T06:53:15.000ZLast changed 2026-08-29T06:22:34.000ZCVSS 7.8
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: mm/percpu-km: fix bitmap overflow and accounting in pcpu_create_chunk() In pcpu_create_chunk(), nr_pages is the total contiguous backing allocation, i.e., nr_units * pcpu_unit_pages, but pcpu_chunk_populated() uses it to set chunk->populated, whose size is pcpu_unit_pages, bitmap. Since bit N in chunk->populated means page offset N inside every unit is backed. When nr_units > 1, the function writes beyond chunk->populated. Fix it by using chunk->nr_pages. It also fixes the global pcpu_nr_empty_pop_pages accounting, since pcpu_balance_free() only iterates up to chunk->nr_pages. Commit a63d4ac4ab609 ("percpu: make percpu-km set chunk->populated bitmap properly") introduced the bitmap overflow issue. Later, commit b539b87fed37f ("percpu: implmeent pcpu_nr_empty_pop_pages and chunk->nr_populated") added pcpu_nr_empty_pop_pages and caused the accounting issue.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 7.2; patch: 6.1.183; a63d4ac4ab6094c051a5a240260d16117a7a2f86 <89b1b79c308818a715e75f28744b70d8940a07c9; a63d4ac4ab6094c051a5a240260d16117a7a2f86 <a6940b84c8c035da465b7165fdfcfb005545724e; patch: 5.10.265; patch: 0; a63d4ac4ab6094c051a5a240260d16117a7a2f86 <92c43ac3c2b09eb16162e8144e73c00b7c3e29d6; patch: 5.15.216; patch: 6.18.44; 3.18; a63d4ac4ab6094c051a5a240260d16117a7a2f86 <32134cf9211b83bed9076d0739c5906fbea4c763; a63d4ac4ab6094c051a5a240260d16117a7a2f86 <5c7fc39bf19abb38a996aaad77b3e3a8f48581c3; patch: 6.12.103; a63d4ac4ab6094c051a5a240260d16117a7a2f86 <6fc7da2a052f2825fff785e860e67183f5acaaba; a63d4ac4ab6094c051a5a240260d16117a7a2f86 <5f43d2c1bea280dcdfabaf156c25e7402fb8039f; patch: 6.6.151; a63d4ac4ab6094c051a5a240260d16117a7a2f86 <01504da375f5b19df195cb1cb1cf1dd184318f97; patch: 7.1.8
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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