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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.

在 Linux 内核中，以下漏洞已得到修复： ptp: vmclock: 防止只读映射变为可写 函数在共享的 vmclock ABI 页面试图建立可写映射时会返回 错误，但它仍保留了 标志位。用户空间程序可以先以只读方式映射该页面，随后通过 将其升级为可写，从而允许客户机（guest）破坏 vmclock ABI 中定义为由宿主机（host）写入的时间同步数据（包括序列计数器、UTC 时间和 TSC 偏移量）。 修复方法是：在只读路径上清除 标志，从而阻止映射被升级。此做法与 i915 驱动处理其只读对象的方式一致

CVSS 8.8 · High EPSS 0.15% · P5

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 20503272422693d793b84f88bf23fe4e955d3a33< 5b4f2bec7bea6c04084d720d731bedee7caf878d affected
20503272422693d793b84f88bf23fe4e955d3a33< 2496e141827102d6af512950057d402a2cfb2bfc affected
20503272422693d793b84f88bf23fe4e955d3a33< 2e596e7814ba38cdc129991058b6c254ed37cb11 affected
6.13 affected
< 6.13 unaffected
6.18.47≤ 6.18.* unaffected
7.1.11≤ 7.1.* unaffected
7.2.1≤ 7.2.* unaffected
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I. Basic Information for CVE-2026-80724

Vulnerability Information
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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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 20503272422693d793b84f88bf23fe4e955d3a33 ~ 5b4f2bec7bea6c04084d720d731bedee7caf878d -
Linux Linux 6.13 -

II. Public POCs for CVE-2026-80724

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III. Intelligence Information for CVE-2026-80724

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Patches & Fixes for CVE-2026-80724 (3)

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

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