CVE-2025-21887 (GCVE-0-2025-21887)

Vulnerability from cvelistv5 – Published: 2025-03-27 14:57 – Updated: 2026-05-23 15:57
VLAI
Title
ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up
Summary
In the Linux kernel, the following vulnerability has been resolved: ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up The issue was caused by dput(upper) being called before ovl_dentry_update_reval(), while upper->d_flags was still accessed in ovl_dentry_remote(). Move dput(upper) after its last use to prevent use-after-free. BUG: KASAN: slab-use-after-free in ovl_dentry_remote fs/overlayfs/util.c:162 [inline] BUG: KASAN: slab-use-after-free in ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 ovl_dentry_remote fs/overlayfs/util.c:162 [inline] ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167 ovl_link_up fs/overlayfs/copy_up.c:610 [inline] ovl_copy_up_one+0x2105/0x3490 fs/overlayfs/copy_up.c:1170 ovl_copy_up_flags+0x18d/0x200 fs/overlayfs/copy_up.c:1223 ovl_rename+0x39e/0x18c0 fs/overlayfs/dir.c:1136 vfs_rename+0xf84/0x20a0 fs/namei.c:4893 ... </TASK>
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 714ba10a6dd19752a349e59aa875f3288ccb59b9 , < f77618291836168eca99e89cd175256f928f5e64 (git)
Affected: 62f29ca45f832e281fc14966ac25f6ff3bd121ca , < 4b49d939b5a79117f939b77cc67efae2694d9799 (git)
Affected: e4f2a1feebb3f209a0fca82aa53507a5b8be4d53 , < a7c41830ffcd17b2177a95a9b99b270302090c35 (git)
Affected: b07d5cc93e1b28df47a72c519d09d0a836043613 , < 64455c8051c3aedc71abb7ec8d47c80301f99f00 (git)
Affected: b07d5cc93e1b28df47a72c519d09d0a836043613 , < 3594aad97e7be2557ca9fa9c931b206b604028c8 (git)
Affected: b07d5cc93e1b28df47a72c519d09d0a836043613 , < 60b4b5c1277fc491da9e1e7abab307bfa39c2db7 (git)
Affected: b07d5cc93e1b28df47a72c519d09d0a836043613 , < c84e125fff2615b4d9c259e762596134eddd2f27 (git)
Affected: 33ab4dd6202f359558a0a2678b94d1b9994c17e5 (git)
Affected: 1ecdc55e5cd9f70f8d7513802971d4cffb9f77af (git)
Affected: 5.10.188 , < 5.10.247 (semver)
Affected: 5.15.121 , < 5.15.179 (semver)
Affected: 6.1.39 , < 6.1.130 (semver)
Affected: 6.3.13 , < 6.4 (semver)
Affected: 6.4.4 , < 6.5 (semver)
Create a notification for this product.
Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.130 , ≤ 6.1.* (semver)
Unaffected: 6.6.81 , ≤ 6.6.* (semver)
Unaffected: 6.12.18 , ≤ 6.12.* (semver)
Unaffected: 6.13.6 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\novl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up\n\nThe issue was caused by dput(upper) being called before\novl_dentry_update_reval(), while upper-\u003ed_flags was still\naccessed in ovl_dentry_remote().\n\nMove dput(upper) after its last use to prevent use-after-free.\n\nBUG: KASAN: slab-use-after-free in ovl_dentry_remote fs/overlayfs/util.c:162 [inline]\nBUG: KASAN: slab-use-after-free in ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167\n\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0xc3/0x620 mm/kasan/report.c:488\n kasan_report+0xd9/0x110 mm/kasan/report.c:601\n ovl_dentry_remote fs/overlayfs/util.c:162 [inline]\n ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167\n ovl_link_up fs/overlayfs/copy_up.c:610 [inline]\n ovl_copy_up_one+0x2105/0x3490 fs/overlayfs/copy_up.c:1170\n ovl_copy_up_flags+0x18d/0x200 fs/overlayfs/copy_up.c:1223\n ovl_rename+0x39e/0x18c0 fs/overlayfs/dir.c:1136\n vfs_rename+0xf84/0x20a0 fs/namei.c:4893\n...\n \u003c/TASK\u003e"
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          "url": "https://git.kernel.org/stable/c/4b49d939b5a79117f939b77cc67efae2694d9799"
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          "url": "https://git.kernel.org/stable/c/c84e125fff2615b4d9c259e762596134eddd2f27"
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      "title": "ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21887",
    "datePublished": "2025-03-27T14:57:14.524Z",
    "dateReserved": "2024-12-29T08:45:45.782Z",
    "dateUpdated": "2026-05-23T15:57:20.970Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-21887",
      "date": "2026-07-04",
      "epss": "0.00182",
      "percentile": "0.07938"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-21887\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-03-27T15:15:56.603\",\"lastModified\":\"2026-06-17T08:44:31.973\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\novl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up\\n\\nThe issue was caused by dput(upper) being called before\\novl_dentry_update_reval(), while upper-\u003ed_flags was still\\naccessed in ovl_dentry_remote().\\n\\nMove dput(upper) after its last use to prevent use-after-free.\\n\\nBUG: KASAN: slab-use-after-free in ovl_dentry_remote fs/overlayfs/util.c:162 [inline]\\nBUG: KASAN: slab-use-after-free in ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167\\n\\nCall Trace:\\n \u003cTASK\u003e\\n __dump_stack lib/dump_stack.c:88 [inline]\\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114\\n print_address_description mm/kasan/report.c:377 [inline]\\n print_report+0xc3/0x620 mm/kasan/report.c:488\\n kasan_report+0xd9/0x110 mm/kasan/report.c:601\\n ovl_dentry_remote fs/overlayfs/util.c:162 [inline]\\n ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167\\n ovl_link_up fs/overlayfs/copy_up.c:610 [inline]\\n ovl_copy_up_one+0x2105/0x3490 fs/overlayfs/copy_up.c:1170\\n ovl_copy_up_flags+0x18d/0x200 fs/overlayfs/copy_up.c:1223\\n ovl_rename+0x39e/0x18c0 fs/overlayfs/dir.c:1136\\n vfs_rename+0xf84/0x20a0 fs/namei.c:4893\\n...\\n \u003c/TASK\u003e\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ovl: Se corrige el UAF en ovl_dentry_update_reval moviendo dput() en ovl_link_up. El problema se deb\u00eda a que dput(upper) se llamaba antes de ovl_dentry_update_reval(), mientras que se segu\u00eda accediendo a upper-\u0026gt;d_flags en ovl_dentry_remote(). Se mueve dput(upper) despu\u00e9s de su \u00faltimo uso para evitar el use-after-free. ERROR: KASAN: slab-use-after-free en ovl_dentry_remote fs/overlayfs/util.c:162 [en l\u00ednea] ERROR: KASAN: slab-use-after-free en ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167 Rastreo de llamadas:  __dump_stack lib/dump_stack.c:88 [en l\u00ednea] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [en l\u00ednea] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 ovl_dentry_remote fs/overlayfs/util.c:162 [en l\u00ednea] ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167 ovl_link_up fs/overlayfs/copy_up.c:610 [en l\u00ednea] ovl_copy_up_one+0x2105/0x3490 fs/overlayfs/copy_up.c:1170 ovl_copy_up_flags+0x18d/0x200 fs/overlayfs/copy_up.c:1223 ovl_rename+0x39e/0x18c0 fs/overlayfs/dir.c:1136 vfs_rename+0xf84/0x20a0 fs/namei.c:4893 ... \"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/overlayfs/copy_up.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"714ba10a6dd19752a349e59aa875f3288ccb59b9\",\"lessThan\":\"f77618291836168eca99e89cd175256f928f5e64\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"62f29ca45f832e281fc14966ac25f6ff3bd121ca\",\"lessThan\":\"4b49d939b5a79117f939b77cc67efae2694d9799\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e4f2a1feebb3f209a0fca82aa53507a5b8be4d53\",\"lessThan\":\"a7c41830ffcd17b2177a95a9b99b270302090c35\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b07d5cc93e1b28df47a72c519d09d0a836043613\",\"lessThan\":\"64455c8051c3aedc71abb7ec8d47c80301f99f00\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b07d5cc93e1b28df47a72c519d09d0a836043613\",\"lessThan\":\"3594aad97e7be2557ca9fa9c931b206b604028c8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b07d5cc93e1b28df47a72c519d09d0a836043613\",\"lessThan\":\"60b4b5c1277fc491da9e1e7abab307bfa39c2db7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b07d5cc93e1b28df47a72c519d09d0a836043613\",\"lessThan\":\"c84e125fff2615b4d9c259e762596134eddd2f27\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"33ab4dd6202f359558a0a2678b94d1b9994c17e5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1ecdc55e5cd9f70f8d7513802971d4cffb9f77af\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.188\",\"lessThan\":\"5.10.247\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.121\",\"lessThan\":\"5.15.179\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.39\",\"lessThan\":\"6.1.130\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.3.13\",\"lessThan\":\"6.4\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.4.4\",\"lessThan\":\"6.5\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/overlayfs/copy_up.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.5\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.5\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.247\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.179\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.130\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.81\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.18\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.13.6\",\"lessThanOrEqual\":\"6.13.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.14\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2025-03-27T16:59:58.510815Z\",\"id\":\"CVE-2025-21887\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA 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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-11-03T19:38:40.259Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-21887\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-03-27T16:59:58.510815Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-03-27T16:59:59.833Z\"}}], \"cna\": {\"title\": \"ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"714ba10a6dd19752a349e59aa875f3288ccb59b9\", \"lessThan\": \"f77618291836168eca99e89cd175256f928f5e64\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"62f29ca45f832e281fc14966ac25f6ff3bd121ca\", \"lessThan\": \"4b49d939b5a79117f939b77cc67efae2694d9799\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e4f2a1feebb3f209a0fca82aa53507a5b8be4d53\", \"lessThan\": \"a7c41830ffcd17b2177a95a9b99b270302090c35\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b07d5cc93e1b28df47a72c519d09d0a836043613\", \"lessThan\": \"64455c8051c3aedc71abb7ec8d47c80301f99f00\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b07d5cc93e1b28df47a72c519d09d0a836043613\", \"lessThan\": \"3594aad97e7be2557ca9fa9c931b206b604028c8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b07d5cc93e1b28df47a72c519d09d0a836043613\", \"lessThan\": \"60b4b5c1277fc491da9e1e7abab307bfa39c2db7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b07d5cc93e1b28df47a72c519d09d0a836043613\", \"lessThan\": \"c84e125fff2615b4d9c259e762596134eddd2f27\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"33ab4dd6202f359558a0a2678b94d1b9994c17e5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1ecdc55e5cd9f70f8d7513802971d4cffb9f77af\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/overlayfs/copy_up.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.5\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.5\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.247\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.179\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.130\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.81\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.18\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.13.*\"}, {\"status\": \"unaffected\", \"version\": \"6.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/overlayfs/copy_up.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/f77618291836168eca99e89cd175256f928f5e64\"}, {\"url\": \"https://git.kernel.org/stable/c/4b49d939b5a79117f939b77cc67efae2694d9799\"}, {\"url\": \"https://git.kernel.org/stable/c/a7c41830ffcd17b2177a95a9b99b270302090c35\"}, {\"url\": \"https://git.kernel.org/stable/c/64455c8051c3aedc71abb7ec8d47c80301f99f00\"}, {\"url\": \"https://git.kernel.org/stable/c/3594aad97e7be2557ca9fa9c931b206b604028c8\"}, {\"url\": \"https://git.kernel.org/stable/c/60b4b5c1277fc491da9e1e7abab307bfa39c2db7\"}, {\"url\": \"https://git.kernel.org/stable/c/c84e125fff2615b4d9c259e762596134eddd2f27\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\novl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up\\n\\nThe issue was caused by dput(upper) being called before\\novl_dentry_update_reval(), while upper-\u003ed_flags was still\\naccessed in ovl_dentry_remote().\\n\\nMove dput(upper) after its last use to prevent use-after-free.\\n\\nBUG: KASAN: slab-use-after-free in ovl_dentry_remote fs/overlayfs/util.c:162 [inline]\\nBUG: KASAN: slab-use-after-free in ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167\\n\\nCall Trace:\\n \u003cTASK\u003e\\n __dump_stack lib/dump_stack.c:88 [inline]\\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114\\n print_address_description mm/kasan/report.c:377 [inline]\\n print_report+0xc3/0x620 mm/kasan/report.c:488\\n kasan_report+0xd9/0x110 mm/kasan/report.c:601\\n ovl_dentry_remote fs/overlayfs/util.c:162 [inline]\\n ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167\\n ovl_link_up fs/overlayfs/copy_up.c:610 [inline]\\n ovl_copy_up_one+0x2105/0x3490 fs/overlayfs/copy_up.c:1170\\n ovl_copy_up_flags+0x18d/0x200 fs/overlayfs/copy_up.c:1223\\n ovl_rename+0x39e/0x18c0 fs/overlayfs/dir.c:1136\\n vfs_rename+0xf84/0x20a0 fs/namei.c:4893\\n...\\n \u003c/TASK\u003e\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.247\", \"versionStartIncluding\": \"5.10.188\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.179\", \"versionStartIncluding\": \"5.15.121\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.130\", \"versionStartIncluding\": \"6.1.39\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.81\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.18\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.6\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14\", \"versionStartIncluding\": \"6.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.4.4\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:08:26.759Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21887\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T21:08:26.759Z\", \"dateReserved\": \"2024-12-29T08:45:45.782Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-03-27T14:57:14.524Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.