CVE-2026-43076

{"id": "CVE-2026-43076", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "23193e513d1cd69411469f028d56fd175d4a6b07", "lessThan": "d012c782abcabe68b5b9e71be58a15e9f9d83dc1", "versionType": "git"}, {"status": "affected", "version": "23193e513d1cd69411469f028d56fd175d4a6b07", "lessThan": "bcd46bc261b215b3b12c557a978299eafa02ecdd", "versionType": "git"}, {"status": "affected", "version": "23193e513d1cd69411469f028d56fd175d4a6b07", "lessThan": "131c0b573e1b467b7d553e9ff38003f1acd8f5f2", "versionType": "git"}, {"status": "affected", "version": "23193e513d1cd69411469f028d56fd175d4a6b07", "lessThan": "37f074e65f24f10f8d8df224a572e4cb9e6faf63", "versionType": "git"}, {"status": "affected", "version": "23193e513d1cd69411469f028d56fd175d4a6b07", "lessThan": "c1de19e891be3bfb3e1d0c7cf07bbb8fb3b77c1b", "versionType": "git"}, {"status": "affected", "version": "23193e513d1cd69411469f028d56fd175d4a6b07", "lessThan": "cd2d765aa7157f852999842af32148128c735d39", "versionType": "git"}, {"status": "affected", "version": "23193e513d1cd69411469f028d56fd175d4a6b07", "lessThan": "77d0295725109d77f5854ef5b58c0d06c08168cc", "versionType": "git"}, {"status": "affected", "version": "23193e513d1cd69411469f028d56fd175d4a6b07", "lessThan": "1524af3685b35feac76662cc551cbc37bd14775f", "versionType": "git"}], "programFiles": ["fs/ocfs2/inode.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.24"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.24", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.258", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.209", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.175", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.136", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.83", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.24", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.14", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/ocfs2/inode.c"], "defaultStatus": "affected"}]}], "published": "2026-05-06T10:16:20.590", "references": [{"url": "https://git.kernel.org/stable/c/131c0b573e1b467b7d553e9ff38003f1acd8f5f2", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/1524af3685b35feac76662cc551cbc37bd14775f", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/37f074e65f24f10f8d8df224a572e4cb9e6faf63", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/77d0295725109d77f5854ef5b58c0d06c08168cc", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/bcd46bc261b215b3b12c557a978299eafa02ecdd", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c1de19e891be3bfb3e1d0c7cf07bbb8fb3b77c1b", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/cd2d765aa7157f852999842af32148128c735d39", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d012c782abcabe68b5b9e71be58a15e9f9d83dc1", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-416"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: validate inline data i_size during inode read\n\nWhen reading an inode from disk, ocfs2_validate_inode_block() performs\nvarious sanity checks but does not validate the size of inline data. If\nthe filesystem is corrupted, an inode's i_size can exceed the actual\ninline data capacity (id_count).\n\nThis causes ocfs2_dir_foreach_blk_id() to iterate beyond the inline data\nbuffer, triggering a use-after-free when accessing directory entries from\nfreed memory.\n\nIn the syzbot report:\n - i_size was 1099511627576 bytes (~1TB)\n - Actual inline data capacity (id_count) is typically <256 bytes\n - A garbage rec_len (54648) caused ctx->pos to jump out of bounds\n - This triggered a UAF in ocfs2_check_dir_entry()\n\nFix by adding a validation check in ocfs2_validate_inode_block() to ensure\ninodes with inline data have i_size <= id_count. This catches the\ncorruption early during inode read and prevents all downstream code from\noperating on invalid data."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: ocfs2: validar el i_size de los datos en l\u00ednea durante la lectura de inodos Al leer un inodo del disco, ocfs2_validate_inode_block() realiza varias comprobaciones de coherencia, pero no valida el tama\u00f1o de los datos en l\u00ednea. Si el sistema de archivos est\u00e1 corrupto, el i_size de un inodo puede exceder la capacidad real de los datos en l\u00ednea (id_count). Esto provoca que ocfs2_dir_foreach_blk_id() itere m\u00e1s all\u00e1 del b\u00fafer de datos en l\u00ednea, lo que desencadena un uso despu\u00e9s de liberaci\u00f3n al acceder a entradas de directorio desde memoria liberada. En el informe de syzbot: - el i_size era de 1099511627576 bytes (~1TB) - La capacidad real de los datos en l\u00ednea (id_count) es t\u00edpicamente menor que 256 bytes - Un rec_len (54648) err\u00f3neo hizo que ctx -> pos saltara fuera de los l\u00edmites - Esto desencaden\u00f3 un UAF en ocfs2_check_dir_entry() Soluci\u00f3n: a\u00f1adiendo una comprobaci\u00f3n de validaci\u00f3n en ocfs2_validate_inode_block() para asegurar que los inodos con datos en l\u00ednea tengan i_size <= id_count. Esto detecta la corrupci\u00f3n tempranamente durante la lectura del inodo y evita que todo el c\u00f3digo posterior opere con datos inv\u00e1lidos."}], "lastModified": "2026-11-11T21:10:00.200", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3C45350C-5A79-40F0-B6B0-BF9ED7FA81B4", "versionEndExcluding": "6.6.136", "versionStartIncluding": "2.6.24.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7F0AE5B5-23AC-4DCC-B37A-51CA1DAE7BA8", "versionEndExcluding": "6.12.83", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8126B8B8-6D0B-4443-86C1-672AEE893555", "versionEndExcluding": "6.18.24", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D6A8A074-BBF4-4803-ABED-519A839435BB", "versionEndExcluding": "6.19.14", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:2.6.24:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6F3E61F3-1CF1-4176-94CD-89A408BCFC96"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}