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CVE-2026-80723— of: reserved_mem: prevent OOB when too many dynamic regions are defined

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 6.12.13版本至6.12.103之前版本和6.13版本存在安全漏洞，该漏洞源于fdt_scan_reserved_mem()函数缺少边界检查，当设备树定义的动态预留内存区域超过MAX_RESERVED_REGIONS时，可能导致越界写入。

CVSS 8.4 · High EPSS 0.13% · P2

Affected Version Matrix 11

VendorProduct Version RangeStatus
Linux Linux 9a0fe62f93ede02c27aaca81112af1e59c8c0979< 68d27250c9e81ab7764603e346c2b1017cb53adf affected
8a6e02d0c00e7b62e6acb74146878bb91e9e7e31< cfa7e2734877330d6c10e0f33953905486c4530c affected
8a6e02d0c00e7b62e6acb74146878bb91e9e7e31< de8ccbd6bf4efe7a059e2c483789936009e10f42 affected
8a6e02d0c00e7b62e6acb74146878bb91e9e7e31< db3dbdfea1b8f38774419c5c2c14e4b81c48708d affected
6.12.13< 6.12.103 affected
6.13 affected
< 6.13 unaffected
6.12.103≤ 6.12.* unaffected
… +3 more rows
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I. Basic Information for CVE-2026-80723

Vulnerability Information
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Vulnerability Title
of: reserved_mem: prevent OOB when too many dynamic regions are defined
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: of: reserved_mem: prevent OOB when too many dynamic regions are defined On boot, fdt_scan_reserved_mem() saves each dynamically-placed /reserved-memory subnode into a local array of size MAX_RESERVED_REGIONS. If the device tree defines more than MAX_RESERVED_REGIONS dynamically-placed regions, fdt_scan_reserved_mem() writes past the end of the local array. Add a bounds check that logs an error and skips the excess regions, restoring the original behavior.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/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 6.12.13版本至6.12.103之前版本和6.13版本存在安全漏洞，该漏洞源于fdt_scan_reserved_mem()函数缺少边界检查，当设备树定义的动态预留内存区域超过MAX_RESERVED_REGIONS时，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 9a0fe62f93ede02c27aaca81112af1e59c8c0979 ~ 68d27250c9e81ab7764603e346c2b1017cb53adf -
Linux Linux 6.13 -

II. Public POCs for CVE-2026-80723

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III. Intelligence Information for CVE-2026-80723

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Patches & Fixes for CVE-2026-80723 (4)

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-2026-80722 8.8 HIGH wifi: mac80211: validate individual TWT params before driver setup
CVE-2026-80683 8.8 HIGH Bluetooth: SCO: give the socket its own sco_conn reference
CVE-2026-80692 8.8 HIGH Bluetooth: hci_sync: hold conn in hci_connect_acl/le_sync() callbacks

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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