Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-80724— ptp: vmclock: prevent read-only mappings from becoming writable

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 6.13版本存在安全漏洞，该漏洞源于vmclock_miscdev_mmap()函数在拒绝可写映射时未清除VM_MAYWRITE标志，导致用户空间可将只读映射升级为可写，破坏主机写入的只读计时数据。

CVSS 8.8 · High EPSS 0.18% · P7

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 20503272422693d793b84f88bf23fe4e955d3a33< 5b4f2bec7bea6c04084d720d731bedee7caf878d affected
20503272422693d793b84f88bf23fe4e955d3a33< 3f5677d2f817355147337f0453174c7bb0f3b66a affected
20503272422693d793b84f88bf23fe4e955d3a33< 2496e141827102d6af512950057d402a2cfb2bfc affected
20503272422693d793b84f88bf23fe4e955d3a33< 2e596e7814ba38cdc129991058b6c254ed37cb11 affected
20503272422693d793b84f88bf23fe4e955d3a33< 0ce59c4148ecd1520c5592a63bb3c8991ee2d326 affected
20503272422693d793b84f88bf23fe4e955d3a33< a5edadbae57e2298a56cf7a4e774a027905a331f affected
6.13 affected
< 6.13 unaffected
… +6 more rows
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-80724

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
ptp: vmclock: prevent read-only mappings from becoming writable
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ptp: vmclock: prevent read-only mappings from becoming writable vmclock_miscdev_mmap() rejects writable mappings of the shared vmclock ABI page with -EROFS, but leaves VM_MAYWRITE set. Userspace can map the page read-only and then upgrade it to writable with mprotect(), after which the guest can corrupt the host-written timekeeping data (sequence counter, UTC time, TSC offset) that the vmclock ABI defines as read-only. Clear VM_MAYWRITE on the read-only path so the mapping cannot be upgraded, as i915 does for its read-only objects and as fixed in drm/vc4 (CVE-2026-68445) and drm/panthor (CVE-2024-53071).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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 6.13版本存在安全漏洞，该漏洞源于vmclock_miscdev_mmap()函数在拒绝可写映射时未清除VM_MAYWRITE标志，导致用户空间可将只读映射升级为可写，破坏主机写入的只读计时数据。
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 20503272422693d793b84f88bf23fe4e955d3a33 ~ 5b4f2bec7bea6c04084d720d731bedee7caf878d -
Linux Linux 6.13 -

II. Public POCs for CVE-2026-80724

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-80724

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-80724 (5)

Other References for CVE-2026-80724 (1)

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

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-2026-80600 9.8 CRITICAL batman-adv: dat: acquire ARP hw source only after skb realloc
CVE-2026-80668 9.8 CRITICAL netfilter: nf_conntrack_expect: use conntrack GC to reap expectations
CVE-2026-80714 9.8 CRITICAL ipvs: do not propagate one-packet flag to synced conns
CVE-2026-80634 9.8 CRITICAL netfilter: flowtable: avoid num_encaps underflow on bridge VLAN untag
CVE-2026-80630 9.8 CRITICAL net/sched: sch_fq_codel: Do not call qdisc_tree_reduce_backlog during peek before restorin
CVE-2026-80609 9.8 CRITICAL qede: fix out-of-bounds check for cqe->len_list[]
CVE-2026-80612 9.8 CRITICAL net: lwtunnel: Drop skb metadata before LWT encapsulation
CVE-2026-80617 9.8 CRITICAL net: airoha: fix foe_check_time allocation size
CVE-2026-80684 9.3 CRITICAL KVM: s390: pci: Fix NULL dereference on AIBV allocation failure
CVE-2026-80693 9.3 CRITICAL idpf: bound interrupt-vector register fill to the allocated array
CVE-2026-80671 9.3 CRITICAL perf sched: Fix register_pid() overflow, strcpy, and BUG_ON
CVE-2026-80670 9.1 CRITICAL perf tools: Use perf_env__get_cpu_topology() in machine__resolve()
CVE-2026-80603 9.1 CRITICAL netfilter: nf_conntrack_irc: fix parse_dcc() off-by-one OOB read
CVE-2026-80721 8.8 HIGH Bluetooth: ISO: ensure no dangling hcon references in iso_conn
CVE-2026-80672 8.8 HIGH ntfs: fix u16 truncation of restart-area length check
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

V. Comments for CVE-2026-80724

No comments yet

Leave a comment