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CVE-2026-80627— MIPS: mm: Fix out-of-bounds write in maar_res_walk()

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 5.4版本存在安全漏洞，该漏洞源于maar_res_walk()函数在数组已满后仍向固定大小的wi->cfg数组写入数据，可能导致越界写入。

AI Predicted 5.5 Difficulty: Hard EPSS 0.22% · P12

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux a5718fe8f70f33b1b5b47a153057cfdd19684598< a594100e147a6a67eb29189170f1df3645cda12b affected
a5718fe8f70f33b1b5b47a153057cfdd19684598< 8b3e0c1c63015deaf084286899f5b2d0526715de affected
a5718fe8f70f33b1b5b47a153057cfdd19684598< 44c1d902cf0798b60762a7a98be992b9f5ded7dd affected
a5718fe8f70f33b1b5b47a153057cfdd19684598< ac7385af1dca86a5ea704c80ca4dc822083ff9e2 affected
a5718fe8f70f33b1b5b47a153057cfdd19684598< 431812eb88c200bc3ec33b88782c8cc415842074 affected
a5718fe8f70f33b1b5b47a153057cfdd19684598< 92f38fe85198ace9b211bc7712b7951acfb94560 affected
a5718fe8f70f33b1b5b47a153057cfdd19684598< 038f068cced8e9c49e8c419f3112d909ad366a3a affected
a5718fe8f70f33b1b5b47a153057cfdd19684598< 1b001b16bc88f3f7817e228acfd91ee01bdcfcce affected
… +10 more rows
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I. Basic Information for CVE-2026-80627

Vulnerability Information
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Vulnerability Title
MIPS: mm: Fix out-of-bounds write in maar_res_walk()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: MIPS: mm: Fix out-of-bounds write in maar_res_walk() maar_res_walk() uses wi->num_cfg as the index into the fixed-size wi->cfg array, but checks whether the array is full only after it has filled the selected entry. If walk_system_ram_range() reports more than 16 memory ranges, the overflow call writes one struct maar_config past the end of the array before WARN_ON() prevents num_cfg from advancing. Move the full-array check before taking the array slot and return non-zero when the scratch array is full, so walk_system_ram_range() terminates the walk instead of invoking the callback for further ranges.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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 5.4版本存在安全漏洞，该漏洞源于maar_res_walk()函数在数组已满后仍向固定大小的wi->cfg数组写入数据，可能导致越界写入。
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 a5718fe8f70f33b1b5b47a153057cfdd19684598 ~ a594100e147a6a67eb29189170f1df3645cda12b -
Linux Linux 5.4 -

II. Public POCs for CVE-2026-80627

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III. Intelligence Information for CVE-2026-80627

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Patches & Fixes for CVE-2026-80627 (7)

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-2026-80714 9.8 CRITICAL ipvs: do not propagate one-packet flag to synced conns
CVE-2026-80609 9.8 CRITICAL qede: fix out-of-bounds check for cqe->len_list[]
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

V. Comments for CVE-2026-80627

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