222 lines
12 KiB
JSON
222 lines
12 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-80724",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-26T14:34:25.788Z",
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"datePublished": "2026-08-28T07:03:08.410Z",
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"dateUpdated": "2026-10-19T08:43:13.410Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T08:43:13.410Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nptp: vmclock: prevent read-only mappings from becoming writable\n\nvmclock_miscdev_mmap() rejects writable mappings of the shared vmclock\nABI page with -EROFS, but leaves VM_MAYWRITE set. Userspace can map the\npage read-only and then upgrade it to writable with mprotect(), after\nwhich the guest can corrupt the host-written timekeeping data (sequence\ncounter, UTC time, TSC offset) that the vmclock ABI defines as read-only.\n\nClear VM_MAYWRITE on the read-only path so the mapping cannot be\nupgraded, as i915 does for its read-only objects and as fixed in drm/vc4\n(CVE-2026-68445) and drm/panthor (CVE-2024-53071)."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
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"baseScore": 8.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - Exploitation requires local syscalls to open /dev/vmclock0, mmap the shared ABI page read-only, mprotect it writable, and write host-authoritative fields; there is no network, Bluetooth, or physical-device path to vmclock_miscdev_mmap().\nAC:L - Any process that can open the misc device can reliably mmap(PROT_READ), mprotect(PROT_WRITE), and corrupt the page without races, special memory layout, or timing; VM_MAYWRITE left set is the sole missing check and mprotect honors it per mm/mprotect.c.\nPR:L - vmclock_miscdev_open() performs no capability checks; AWS ClockBound documents chmod a+r on /dev/vmclock0 for unprivileged latency-sensitive apps on EC2/Amazon Linux, so a normal tenant user on affected cloud VMs can reach the bug without root or user-namespace admin caps.\nUI:N - The attacker process performs the full open/mmap/mprotect/write sequence itself; no victim mount, click, or other user action is required beyond the attacker already having local shell access.\nS:C - The vmclock ABI page is hypervisor-written shared memory whose seq_count, UTC time, and TSC offset must stay guest-read-only; mprotect bypass lets a guest user corrupt that host-authoritative data, crossing the guest/hypervisor trust boundary rather than staying within guest-kernel scope alone.\nC:H - Unauthorized writes let an attacker race seq_count updates and corrupt in-flight host-populated fields, yielding torn reads of timekeeping data to other guest consumers and potentially exposing transient host-written values that read-only mmap alone would not reliably observe.\nI:H - After mprotect, the attacker gains arbitrary modification of host-written vmclock_abi fields (seq_count, disruption_marker, counter_value, time_sec, flags), breaking integrity of authoritative timekeeping and migration/disruption signaling relied on by guest kernel PTP and userspace ClockBound consumers.\nA:H - Corrupting seq_count, clock_status, or disruption/vm_generation markers can force ETIMEDOUT/-EINVAL in vmclock_get_crosststamp, trigger false migration/disruption handling, and cause latency-sensitive services to withdraw or fail, producing severe availability loss on affected cloud VMs."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/ptp/ptp_vmclock.c"
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],
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"versions": [
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{
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"version": "20503272422693d793b84f88bf23fe4e955d3a33",
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"lessThan": "5b4f2bec7bea6c04084d720d731bedee7caf878d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "20503272422693d793b84f88bf23fe4e955d3a33",
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"lessThan": "3f5677d2f817355147337f0453174c7bb0f3b66a",
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"status": "affected",
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"versionType": "git"
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},
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{
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"lessThan": "2496e141827102d6af512950057d402a2cfb2bfc",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "20503272422693d793b84f88bf23fe4e955d3a33",
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"lessThan": "2e596e7814ba38cdc129991058b6c254ed37cb11",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "20503272422693d793b84f88bf23fe4e955d3a33",
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"lessThan": "0ce59c4148ecd1520c5592a63bb3c8991ee2d326",
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"status": "affected",
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"versionType": "git"
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{
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"version": "20503272422693d793b84f88bf23fe4e955d3a33",
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"lessThan": "a5edadbae57e2298a56cf7a4e774a027905a331f",
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"status": "affected",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/ptp/ptp_vmclock.c"
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],
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"versions": [
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{
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"version": "6.13",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.13",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.47",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.50",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.11",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.1",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.4",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.13",
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"versionEndExcluding": "6.18.47"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/5b4f2bec7bea6c04084d720d731bedee7caf878d"
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},
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{
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"url": "https://git.kernel.org/stable/c/3f5677d2f817355147337f0453174c7bb0f3b66a"
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"url": "https://git.kernel.org/stable/c/2496e141827102d6af512950057d402a2cfb2bfc"
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{
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"url": "https://git.kernel.org/stable/c/2e596e7814ba38cdc129991058b6c254ed37cb11"
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{
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"url": "https://git.kernel.org/stable/c/0ce59c4148ecd1520c5592a63bb3c8991ee2d326"
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},
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{
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"url": "https://git.kernel.org/stable/c/a5edadbae57e2298a56cf7a4e774a027905a331f"
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}
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],
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"title": "ptp: vmclock: prevent read-only mappings from becoming writable",
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