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CVE-2026-10635— Dangling memory-domain pointer (use-after-free) in Xtensa MMU page-table code on memory-domain de-init

Quick assessment

Affected
zephyrproject zephyr
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.

zephyrproject zephyr是zephyrproject组织开源的一款实时操作系统内核。 Zephyr Project Zephyr 4.4.0版本存在资源管理错误漏洞，该漏洞源于页表代码中的内存域列表管理问题，导致释放后重用和空指针取消引用，可能造成拒绝服务攻击以及内存损坏。

CVSS 6.3 · Medium EPSS 0.16% · P6

Affected Version Matrix 1

VendorProduct Version RangeStatus
zephyrproject zephyr 4.4.0< 4.5.0 affected
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I. Basic Information for CVE-2026-10635

Vulnerability Information
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Vulnerability Title
Dangling memory-domain pointer (use-after-free) in Xtensa MMU page-table code on memory-domain de-init
Source: CVE Program / CVE List V5
Vulnerability Description
On Xtensa targets with CONFIG_USERSPACE and CONFIG_XTENSA_MMU, the page-table code (arch/xtensa/core/ptables.c) maintains a global list, xtensa_domain_list, of active memory domains using a list node embedded inside the caller-owned struct k_mem_domain. When a domain is destroyed via k_mem_domain_deinit() -> arch_mem_domain_deinit(), the page tables are torn down and domain->arch.ptables is set to NULL, but the domain's node was not removed from xtensa_domain_list. The freed/deinitialized domain therefore remained linked into the global list as a dangling pointer into caller-owned storage that may then be freed or reused. Any subsequent arch_mem_map()/arch_mem_unmap() operation (widely invoked by kernel memory-mapping and demand-paging code) traverses the stale node and dereferences domain->ptables: at minimum a NULL pointer dereference causing a fatal MMU exception (denial of service), and if the k_mem_domain storage has been freed or reused, a use-after-free in which a stale/controlled ptables value is dereferenced and written through during the page-table walk (l2_page_table_map writes l1_table[...] and l2_table[...], and xtensa_mmu_compute_domain_regs writes into the domain struct and the L1 table), yielding page-table memory corruption that can undermine userspace isolation. The vulnerable path is reachable only from privileged kernel/supervisor code (k_mem_domain_deinit is not a syscall), not directly from unprivileged user threads or remotely. Affected: Zephyr v4.4.0 (the Xtensa memory-domain de-initialization feature was introduced in commit 3032b58f52d and first shipped in v4.4.0); fixed on main by adding sys_slist_find_and_remove() in arch_mem_domain_deinit(). The Xtensa MPU path is unaffected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Zephyr Project Zephyr 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
zephyrproject zephyr是zephyrproject组织开源的一款实时操作系统内核。 Zephyr Project Zephyr 4.4.0版本存在资源管理错误漏洞，该漏洞源于页表代码中的内存域列表管理问题，导致释放后重用和空指针取消引用，可能造成拒绝服务攻击以及内存损坏。
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
zephyrproject zephyr 4.4.0 ~ 4.5.0 -

II. Public POCs for CVE-2026-10635

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III. Intelligence Information for CVE-2026-10635

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Patches & Fixes for CVE-2026-10635 (1)

Other References for CVE-2026-10635 (1)

Same Patch Batch · zephyrproject · 2026-06-16 · 6 CVEs total

CVE-2026-10638 5.9 MEDIUM Use-after-free in Zephyr ICMPv6 RX path when updating statistics after sending an echo rep
CVE-2026-10637 5.9 MEDIUM Use-after-free of `net_pkt` in IPv6 MLD send path triggerable by a link-local MLD Query
CVE-2026-10639 4.8 MEDIUM Use-after-free reading `net_pkt_iface()` of a sent ICMPv4 echo-reply packet in `icmpv4_han
CVE-2026-10640 4.2 MEDIUM Use-after-free reading `net_pkt` `iface` after send in IPv6 Neighbor Discovery (`ipv6_nbr.
CVE-2026-10636 3.7 LOW Use-after-free in Zephyr IPv4 IGMP send path (`igmp_send`)

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject
Same weakness: CWE-416

V. Comments for CVE-2026-10635

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