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CVE-2026-80718— mm/percpu-km: fix bitmap overflow and accounting in pcpu_create_chunk()

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 3.18版本存在安全漏洞，该漏洞源于mm/percpu-km.c的pcpu_create_chunk()函数错误使用nr_pages设置chunk->populated位图，导致位图溢出，可能造成内存越界写入。

CVSS 7.8 · High EPSS 0.18% · P7

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux a63d4ac4ab6094c051a5a240260d16117a7a2f86< 5f43d2c1bea280dcdfabaf156c25e7402fb8039f affected
a63d4ac4ab6094c051a5a240260d16117a7a2f86< 92c43ac3c2b09eb16162e8144e73c00b7c3e29d6 affected
a63d4ac4ab6094c051a5a240260d16117a7a2f86< 6fc7da2a052f2825fff785e860e67183f5acaaba affected
a63d4ac4ab6094c051a5a240260d16117a7a2f86< 01504da375f5b19df195cb1cb1cf1dd184318f97 affected
a63d4ac4ab6094c051a5a240260d16117a7a2f86< a6940b84c8c035da465b7165fdfcfb005545724e affected
a63d4ac4ab6094c051a5a240260d16117a7a2f86< 32134cf9211b83bed9076d0739c5906fbea4c763 affected
a63d4ac4ab6094c051a5a240260d16117a7a2f86< 5c7fc39bf19abb38a996aaad77b3e3a8f48581c3 affected
a63d4ac4ab6094c051a5a240260d16117a7a2f86< 89b1b79c308818a715e75f28744b70d8940a07c9 affected
… +10 more rows
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I. Basic Information for CVE-2026-80718

Vulnerability Information
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Vulnerability Title
mm/percpu-km: fix bitmap overflow and accounting in pcpu_create_chunk()
Source: CVE Program / CVE List V5
Vulnerability Description
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 3.18版本存在安全漏洞，该漏洞源于mm/percpu-km.c的pcpu_create_chunk()函数错误使用nr_pages设置chunk->populated位图，导致位图溢出，可能造成内存越界写入。
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 a63d4ac4ab6094c051a5a240260d16117a7a2f86 ~ 5f43d2c1bea280dcdfabaf156c25e7402fb8039f -
Linux Linux 3.18 -

II. Public POCs for CVE-2026-80718

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III. Intelligence Information for CVE-2026-80718

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Patches & Fixes for CVE-2026-80718 (8)

Same Patch Batch · Linux · 2026-08-28 · 135 CVEs total

CVE-2026-80634 9.8 CRITICAL netfilter: flowtable: avoid num_encaps underflow on bridge VLAN untag
CVE-2026-80694 9.8 CRITICAL net: ethernet: mtk_eth_soc: pass eth to mtk_handle_irq_rx in poll_controller
CVE-2026-80681 9.8 CRITICAL vxlan: re-fetch eth header after route_shortcircuit()
CVE-2026-80674 9.8 CRITICAL ntfs: validate resident attribute lists and harden the validator
CVE-2026-80673 9.8 CRITICAL ntfs: bound the look-ahead attribute-list entry in ntfs_external_attr_find()
CVE-2026-80668 9.8 CRITICAL netfilter: nf_conntrack_expect: use conntrack GC to reap expectations
CVE-2026-80630 9.8 CRITICAL net/sched: sch_fq_codel: Do not call qdisc_tree_reduce_backlog during peek before restorin
CVE-2026-80617 9.8 CRITICAL net: airoha: fix foe_check_time allocation size
CVE-2026-80612 9.8 CRITICAL net: lwtunnel: Drop skb metadata before LWT encapsulation
CVE-2026-80609 9.8 CRITICAL qede: fix out-of-bounds check for cqe->len_list[]
CVE-2026-80714 9.8 CRITICAL ipvs: do not propagate one-packet flag to synced conns
CVE-2026-80600 9.8 CRITICAL batman-adv: dat: acquire ARP hw source only after skb realloc
CVE-2026-80693 9.3 CRITICAL idpf: bound interrupt-vector register fill to the allocated array
CVE-2026-80684 9.3 CRITICAL KVM: s390: pci: Fix NULL dereference on AIBV allocation failure
CVE-2026-80671 9.3 CRITICAL perf sched: Fix register_pid() overflow, strcpy, and BUG_ON
CVE-2026-80603 9.1 CRITICAL netfilter: nf_conntrack_irc: fix parse_dcc() off-by-one OOB read
CVE-2026-80670 9.1 CRITICAL perf tools: Use perf_env__get_cpu_topology() in machine__resolve()
CVE-2026-80721 8.8 HIGH Bluetooth: ISO: ensure no dangling hcon references in iso_conn
CVE-2026-80722 8.8 HIGH wifi: mac80211: validate individual TWT params before driver setup
CVE-2026-80724 8.8 HIGH ptp: vmclock: prevent read-only mappings from becoming writable

Showing top 20 of 135 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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