154 lines
7.7 KiB
JSON
154 lines
7.7 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-2025-71155",
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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": "2026-01-13T15:30:19.663Z",
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"datePublished": "2026-01-23T14:25:54.663Z",
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"dateUpdated": "2026-08-05T12:12:23.055Z"
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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": "2026-08-05T12:12:23.055Z"
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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\nKVM: s390: Fix gmap_helper_zap_one_page() again\n\nA few checks were missing in gmap_helper_zap_one_page(), which can lead\nto memory corruption in the guest under specific circumstances.\n\nAdd the missing checks."
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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:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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 - An unprivileged process inside an s390 KVM guest can drive the vulnerable path through ordinary page allocation and freeing, which invokes ESSA and reaches handle_essa(), __gmap_zap(), and gmap_helper_zap_one_page().\nAC:L - The attacker can use concurrent memory churn across vCPUs to control the relevant page-state transitions and can induce host backing-memory pressure by touching guest RAM, making repeated race attempts practical.\nPR:L - Although ESSA is privileged, unprivileged guest activity invokes it indirectly through arch_alloc_page() and arch_free_page() without requiring guest administrative capabilities.\nUI:N - Exploitation requires no action by another user once the attacker runs the memory-churning workload.\nS:U - The corruption affects memory within the same guest security authority and does not provide a demonstrated guest-to-host or cross-VM escape.\nC:H - Incorrectly discarding a stable swapped guest page can corrupt attacker-groomed guest kernel memory; successful exploitation could yield guest-kernel execution and unrestricted access to guest secrets.\nI:H - The flaw can replace preserved guest-page contents with a newly faulted page, enabling whole-page corruption of sensitive data or control structures and potentially guest-kernel code execution.\nA:H - Corruption of arbitrary guest data, page tables, or kernel control structures can panic, hang, or otherwise render the guest unavailable."
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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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"arch/s390/mm/gmap_helpers.c"
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],
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"versions": [
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{
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"version": "5deafa27d9ae040b75d392f60b12e300b42b4792",
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"lessThan": "2af2abbcbf8573100288e8f8aea2dab8a2a0ceb7",
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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": "5deafa27d9ae040b75d392f60b12e300b42b4792",
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"lessThan": "2f393c228cc519ddf19b8c6c05bf15723241aa96",
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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": "919efcadb63fc3d3a82c3de7194140e0b28903dc",
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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": "6.17.4",
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"lessThan": "6.18",
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"status": "affected",
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"versionType": "semver"
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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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"arch/s390/mm/gmap_helpers.c"
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],
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"versions": [
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{
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"version": "6.18",
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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": "6.18",
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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": "6.18.4",
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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": "6.19",
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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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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.18",
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"versionEndExcluding": "6.18.4"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.18",
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"versionEndExcluding": "6.19"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.17.4"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/2af2abbcbf8573100288e8f8aea2dab8a2a0ceb7"
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},
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{
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"url": "https://git.kernel.org/stable/c/2f393c228cc519ddf19b8c6c05bf15723241aa96"
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}
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],
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"title": "KVM: s390: Fix gmap_helper_zap_one_page() again",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |