CVE-2025-22121 (GCVE-0-2025-22121)

Vulnerability from cvelistv5 – Published: 2025-04-16 14:13 – Updated: 2026-07-14 12:40
VLAI
Title
ext4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all()
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all() There's issue as follows: BUG: KASAN: use-after-free in ext4_xattr_inode_dec_ref_all+0x6ff/0x790 Read of size 4 at addr ffff88807b003000 by task syz-executor.0/15172 CPU: 3 PID: 15172 Comm: syz-executor.0 Call Trace: __dump_stack lib/dump_stack.c:82 [inline] dump_stack+0xbe/0xfd lib/dump_stack.c:123 print_address_description.constprop.0+0x1e/0x280 mm/kasan/report.c:400 __kasan_report.cold+0x6c/0x84 mm/kasan/report.c:560 kasan_report+0x3a/0x50 mm/kasan/report.c:585 ext4_xattr_inode_dec_ref_all+0x6ff/0x790 fs/ext4/xattr.c:1137 ext4_xattr_delete_inode+0x4c7/0xda0 fs/ext4/xattr.c:2896 ext4_evict_inode+0xb3b/0x1670 fs/ext4/inode.c:323 evict+0x39f/0x880 fs/inode.c:622 iput_final fs/inode.c:1746 [inline] iput fs/inode.c:1772 [inline] iput+0x525/0x6c0 fs/inode.c:1758 ext4_orphan_cleanup fs/ext4/super.c:3298 [inline] ext4_fill_super+0x8c57/0xba40 fs/ext4/super.c:5300 mount_bdev+0x355/0x410 fs/super.c:1446 legacy_get_tree+0xfe/0x220 fs/fs_context.c:611 vfs_get_tree+0x8d/0x2f0 fs/super.c:1576 do_new_mount fs/namespace.c:2983 [inline] path_mount+0x119a/0x1ad0 fs/namespace.c:3316 do_mount+0xfc/0x110 fs/namespace.c:3329 __do_sys_mount fs/namespace.c:3540 [inline] __se_sys_mount+0x219/0x2e0 fs/namespace.c:3514 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x67/0xd1 Memory state around the buggy address: ffff88807b002f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807b002f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807b003000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88807b003080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88807b003100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff Above issue happens as ext4_xattr_delete_inode() isn't check xattr is valid if xattr is in inode. To solve above issue call xattr_check_inode() check if xattr if valid in inode. In fact, we can directly verify in ext4_iget_extra_inode(), so that there is no divergent verification.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e50e5129f384ae282adebfb561189cdb19b81cee , < 27202452b0bc942fdc3db72a44c4dcdab96d5b56 (git)
Affected: e50e5129f384ae282adebfb561189cdb19b81cee , < b374e9ecc92aaa7fb2ab221ee3ff5451118ab566 (git)
Affected: e50e5129f384ae282adebfb561189cdb19b81cee , < c000a8a9b5343a5ef867df173c6349672dacbd0f (git)
Affected: e50e5129f384ae282adebfb561189cdb19b81cee , < 3c591353956ffcace2cc74d09930774afed60619 (git)
Affected: e50e5129f384ae282adebfb561189cdb19b81cee , < 098927a13fd918bd7c64c2de905350a1ad7b4a3a (git)
Affected: e50e5129f384ae282adebfb561189cdb19b81cee , < 0c8fbb6ffb3c8f5164572ca88e4ccb6cd6a41ca8 (git)
Affected: e50e5129f384ae282adebfb561189cdb19b81cee , < 5701875f9609b000d91351eaa6bfd97fe2f157f4 (git)
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Linux Linux Affected: 4.13
Unaffected: 0 , < 4.13 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.161 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.59 , ≤ 6.12.* (semver)
Unaffected: 6.14.2 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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    "cveId": "CVE-2025-22121",
    "datePublished": "2025-04-16T14:13:05.894Z",
    "dateReserved": "2024-12-29T08:45:45.823Z",
    "dateUpdated": "2026-07-14T12:40:51.409Z",
    "state": "PUBLISHED"
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      "date": "2026-07-24",
      "epss": "0.00177",
      "percentile": "0.07496"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-22121\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-04-16T15:16:06.277\",\"lastModified\":\"2026-07-14T13:17:31.580\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all()\\n\\nThere\u0027s issue as follows:\\nBUG: KASAN: use-after-free in ext4_xattr_inode_dec_ref_all+0x6ff/0x790\\nRead of size 4 at addr ffff88807b003000 by task syz-executor.0/15172\\n\\nCPU: 3 PID: 15172 Comm: syz-executor.0\\nCall Trace:\\n __dump_stack lib/dump_stack.c:82 [inline]\\n dump_stack+0xbe/0xfd lib/dump_stack.c:123\\n print_address_description.constprop.0+0x1e/0x280 mm/kasan/report.c:400\\n __kasan_report.cold+0x6c/0x84 mm/kasan/report.c:560\\n kasan_report+0x3a/0x50 mm/kasan/report.c:585\\n ext4_xattr_inode_dec_ref_all+0x6ff/0x790 fs/ext4/xattr.c:1137\\n ext4_xattr_delete_inode+0x4c7/0xda0 fs/ext4/xattr.c:2896\\n ext4_evict_inode+0xb3b/0x1670 fs/ext4/inode.c:323\\n evict+0x39f/0x880 fs/inode.c:622\\n iput_final fs/inode.c:1746 [inline]\\n iput fs/inode.c:1772 [inline]\\n iput+0x525/0x6c0 fs/inode.c:1758\\n ext4_orphan_cleanup fs/ext4/super.c:3298 [inline]\\n ext4_fill_super+0x8c57/0xba40 fs/ext4/super.c:5300\\n mount_bdev+0x355/0x410 fs/super.c:1446\\n legacy_get_tree+0xfe/0x220 fs/fs_context.c:611\\n vfs_get_tree+0x8d/0x2f0 fs/super.c:1576\\n do_new_mount fs/namespace.c:2983 [inline]\\n path_mount+0x119a/0x1ad0 fs/namespace.c:3316\\n do_mount+0xfc/0x110 fs/namespace.c:3329\\n __do_sys_mount fs/namespace.c:3540 [inline]\\n __se_sys_mount+0x219/0x2e0 fs/namespace.c:3514\\n do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46\\n entry_SYSCALL_64_after_hwframe+0x67/0xd1\\n\\nMemory state around the buggy address:\\n ffff88807b002f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n ffff88807b002f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\\n\u003effff88807b003000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\\n                   ^\\n ffff88807b003080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\\n ffff88807b003100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\\n\\nAbove issue happens as ext4_xattr_delete_inode() isn\u0027t check xattr\\nis valid if xattr is in inode.\\nTo solve above issue call xattr_check_inode() check if xattr if valid\\nin inode. In fact, we can directly verify in ext4_iget_extra_inode(),\\nso that there is no divergent verification.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: correcci\u00f3n de lectura fuera de l\u00edmite en ext4_xattr_inode_dec_ref_all() Hay el siguiente problema: ERROR: KASAN: use-after-free en ext4_xattr_inode_dec_ref_all+0x6ff/0x790 Lectura de tama\u00f1o 4 en la direcci\u00f3n ffff88807b003000 por la tarea syz-executor.0/15172 CPU: 3 PID: 15172 Comm: syz-executor.0 Rastreo de llamadas: __dump_stack lib/dump_stack.c:82 [en l\u00ednea] dump_stack+0xbe/0xfd lib/dump_stack.c:123 print_address_description.constprop.0+0x1e/0x280 mm/kasan/report.c:400 __kasan_report.cold+0x6c/0x84 mm/kasan/report.c:560 kasan_report+0x3a/0x50 mm/kasan/report.c:585 ext4_xattr_inode_dec_ref_all+0x6ff/0x790 fs/ext4/xattr.c:1137 ext4_xattr_delete_inode+0x4c7/0xda0 fs/ext4/xattr.c:2896 ext4_evict_inode+0xb3b/0x1670 fs/ext4/inode.c:323 evict+0x39f/0x880 fs/inode.c:622 iput_final fs/inode.c:1746 [en l\u00ednea] iput fs/inode.c:1772 [en l\u00ednea] iput+0x525/0x6c0 fs/inode.c:1758 ext4_orphan_cleanup fs/ext4/super.c:3298 [en l\u00ednea] ext4_fill_super+0x8c57/0xba40 fs/ext4/super.c:5300 mount_bdev+0x355/0x410 fs/super.c:1446 legacy_get_tree+0xfe/0x220 fs/fs_context.c:611 vfs_get_tree+0x8d/0x2f0 fs/super.c:1576 do_new_mount fs/namespace.c:2983 [en l\u00ednea] path_mount+0x119a/0x1ad0 fs/namespace.c:3316 do_mount+0xfc/0x110 fs/namespace.c:3329 __do_sys_mount fs/namespace.c:3540 [en l\u00ednea] __se_sys_mount+0x219/0x2e0 fs/namespace.c:3514 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x67/0xd1 Estado de la memoria alrededor de la direcci\u00f3n con errores: ffff88807b002f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807b002f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 \u0026gt;ffff88807b003000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88807b003080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff88807b003100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff El problema anterior ocurre porque ext4_xattr_delete_inode() no verifica que xattr sea v\u00e1lido si xattr est\u00e1 en el inodo. Para resolver el problema anterior, llame a xattr_check_inode() para verificar si xattr es v\u00e1lido en el inodo. De hecho, podemos verificar directamente en ext4_iget_extra_inode(), de modo que no haya ninguna verificaci\u00f3n divergente.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ext4/inode.c\",\"fs/ext4/xattr.c\",\"fs/ext4/xattr.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e50e5129f384ae282adebfb561189cdb19b81cee\",\"lessThan\":\"27202452b0bc942fdc3db72a44c4dcdab96d5b56\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e50e5129f384ae282adebfb561189cdb19b81cee\",\"lessThan\":\"b374e9ecc92aaa7fb2ab221ee3ff5451118ab566\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e50e5129f384ae282adebfb561189cdb19b81cee\",\"lessThan\":\"c000a8a9b5343a5ef867df173c6349672dacbd0f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e50e5129f384ae282adebfb561189cdb19b81cee\",\"lessThan\":\"3c591353956ffcace2cc74d09930774afed60619\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e50e5129f384ae282adebfb561189cdb19b81cee\",\"lessThan\":\"098927a13fd918bd7c64c2de905350a1ad7b4a3a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e50e5129f384ae282adebfb561189cdb19b81cee\",\"lessThan\":\"0c8fbb6ffb3c8f5164572ca88e4ccb6cd6a41ca8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e50e5129f384ae282adebfb561189cdb19b81cee\",\"lessThan\":\"5701875f9609b000d91351eaa6bfd97fe2f157f4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ext4/inode.c\",\"fs/ext4/xattr.c\",\"fs/ext4/xattr.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.13\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.13\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.248\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.198\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.161\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.120\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.59\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.14.2\",\"lessThanOrEqual\":\"6.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.15\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Siemens\",\"product\":\"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.13\",\"versionEndExcluding\":\"6.14.2\",\"matchCriteriaId\":\"072262CE-6586-4C4E-AD5A-1D2D1925BE62\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/098927a13fd918bd7c64c2de905350a1ad7b4a3a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0c8fbb6ffb3c8f5164572ca88e4ccb6cd6a41ca8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/27202452b0bc942fdc3db72a44c4dcdab96d5b56\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3c591353956ffcace2cc74d09930774afed60619\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5701875f9609b000d91351eaa6bfd97fe2f157f4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b374e9ecc92aaa7fb2ab221ee3ff5451118ab566\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c000a8a9b5343a5ef867df173c6349672dacbd0f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-019113.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T00:45:59+00:00",
      "cve": "CVE-2025-22121",
      "id": "CVE-2025-22121",
      "initial_release_date": "2025-04-16T00:00:00+00:00",
      "product_status:fixed": "1256",
      "product_status:known_affected": "112",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ext4: fix out-of-bound read in ext4_xattr_inode_dec_ref_all()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-22121.json",
      "version": "3"
    }
  }
}



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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.