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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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable OCFS2 inode and directory parsing is reached through a locally mounted crafted filesystem image or local directory enumeration, not by network packet processing. A loopback or local block-device image is a reasonable delivery path, so Local is higher and more appropriate than Physical.\nAC:L - The trigger is a deterministic malformed inline-data inode with i_size greater than id_count; syzbot and the fix discussion show reliable crashes without a race. The attacker controls the filesystem metadata, including the malformed size relationship.\nPR:N - Direct mounting of OCFS2 requires CAP_SYS_ADMIN and OCFS2 lacks FS_USERNS_MOUNT, so an unprivileged attacker cannot self-mount it through a user namespace. In the higher-severity crafted-image scenario, the victim/admin performs the privileged mount, so the attacker needs no pre-existing privileges.\nUI:R - Exploitation requires a victim or system component to mount the crafted OCFS2 filesystem and, depending on state, allow mount recovery or directory enumeration to run. That mount/open/enumeration action is user interaction.\nS:U - The impact is within the kernel instance processing the malicious filesystem. There is no VM, IOMMU, or separate security authority boundary crossed.\nC:H - The bug reads past the inline data buffer into freed memory in ocfs2_check_dir_entry, and readdir can process dirent fields and names from that memory. This is a kernel memory-safety issue with plausible high confidentiality impact.\nI:H - Although the observed report is a UAF read, it is a use-after-free over kernel memory during attacker-controlled metadata parsing. Per the required kernel guidance and uncertainty rule, UAF is scored as potentially enabling high integrity compromise.\nA:H - The syzbot report demonstrates a KASAN use-after-free in kernel context, and malformed metadata can repeatedly trigger invalid freed-memory access. 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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."}], "id": "CVE-2026-43076", "lastModified": "2026-06-17T10:48:53.400", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-06T10:16:20.590", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/131c0b573e1b467b7d553e9ff38003f1acd8f5f2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1524af3685b35feac76662cc551cbc37bd14775f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/37f074e65f24f10f8d8df224a572e4cb9e6faf63"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/77d0295725109d77f5854ef5b58c0d06c08168cc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bcd46bc261b215b3b12c557a978299eafa02ecdd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c1de19e891be3bfb3e1d0c7cf07bbb8fb3b77c1b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cd2d765aa7157f852999842af32148128c735d39"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d012c782abcabe68b5b9e71be58a15e9f9d83dc1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "[email protected]", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ocfs2: validate inline data i_size during inode read", "id": "2466999", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2466999"}, "csaw": false, "cwe": "CWE-1284", "details": ["A flaw was found in the ocfs2 filesystem module of the Linux kernel. This vulnerability occurs when the system attempts to read an inode from a corrupted filesystem, where the inline data size is not properly validated. This can lead to a use-after-free condition, potentially allowing a local attacker to cause a system crash (Denial of Service) or, in some cases, execute arbitrary code."], "name": "CVE-2026-43076", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43076\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43076\nhttps://lore.kernel.org/linux-cve-announce/2026050612-CVE-2026-43076-f173@gregkh/T"]}

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