CVE-2024-26772

{"dataType": "CVE_RECORD", "cveMetadata": {"cveId": "CVE-2024-26772", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.176Z", "datePublished": "2024-04-03T17:00:58.733Z", "dateUpdated": "2026-10-15T00:38:29.232Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:27:09.780Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: avoid allocating blocks from corrupted group in ext4_mb_find_by_goal()\n\nPlaces the logic for checking if the group's block bitmap is corrupt under\nthe protection of the group lock to avoid allocating blocks from the group\nwith a corrupted block bitmap."}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is the ext4 block allocator, reached from local filesystem syscalls (write/fallocate/truncate) on a mounted ext4 volume. No network protocol handler is involved.\nAC:L - The attacker controls both sides of the race \u2014 one thread frees or scans blocks in a group to trigger corruption detection under the group lock while another thread issues a goal-hinted allocation into the same group, and the racing thread spins on ext4_lock_group() for the whole (long) critical section of the corruption detector, so the window is easily won and retried indefinitely.\nPR:L - Only an ordinary unprivileged local account is needed \u2014 any writable directory on an ext4 filesystem (e.g. /tmp or a home directory) lets the attacker drive both the allocation and the block-freeing paths. No capability or userns trick is required.\nUI:N - Exploitation happens through the attacker's own concurrent file I/O on an already-mounted filesystem; no victim action such as mounting an image or opening a file is required.\nS:U - The impact is confined to the kernel/OS security authority \u2014 filesystem metadata corruption and kernel crashes \u2014 with no crossing into a hypervisor, IOMMU, or other separate security scope.\nC:H - Allocating from a group whose bitmap is known-inconsistent hands out blocks that are still in use by other inodes, so the attacker's file can be read back containing another user's on-disk data \u2014 an unbounded disclosure of arbitrary filesystem content.\nI:H - The same double-allocation lets the attacker's writes overwrite other users' file data and ext4 metadata, and the double `percpu_counter_sub` on s_freeclusters_counter corrupts global free-space accounting, giving arbitrary on-disk data modification.\nA:H - The path reaches the divide-by-zero in mb_update_avg_fragment_size() and multiple BUG_ON()s in mb_mark_used() on an inconsistent buddy, and ext4_mb_mark_diskspace_used()'s \"overlap fs metadata\" ext4_error() forces the filesystem read-only (or panics with errors=panic), plus free-cluster underflow causes filesystem-wide ENOSPC."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ext4/mballoc.c"], "versions": [{"version": "163a203ddb36c36d4a1c942aececda0cc8d06aa7", "lessThan": "5a6dcc4ad0f7f7fa8e8d127b5526e7c5f2d38a43", "status": "affected", "versionType": "git"}, {"version": "163a203ddb36c36d4a1c942aececda0cc8d06aa7", "lessThan": "6b92b1bc16d691c95b152c6dbf027ad64315668d", "status": "affected", "versionType": "git"}, {"version": "163a203ddb36c36d4a1c942aececda0cc8d06aa7", "lessThan": "ffeb72a80a82aba59a6774b0611f792e0ed3b0b7", "status": "affected", "versionType": "git"}, {"version": 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{"affected_release": [{"advisory": "RHSA-2024:5102", "cpe": "cpe:/a:redhat:enterprise_linux:8::nfv", "package": "kernel-rt-0:4.18.0-553.16.1.rt7.357.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-08-08T00:00:00Z"}, {"advisory": "RHSA-2024:5101", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.16.1.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-08-08T00:00:00Z"}, {"advisory": "RHSA-2024:6753", "cpe": "cpe:/o:redhat:rhel_aus:8.6", "package": "kernel-0:4.18.0-372.123.1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support", "release_date": "2024-09-18T00:00:00Z"}, {"advisory": "RHSA-2024:6753", "cpe": "cpe:/o:redhat:rhel_tus:8.6", "package": "kernel-0:4.18.0-372.123.1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Telecommunications Update Service", "release_date": "2024-09-18T00:00:00Z"}, {"advisory": "RHSA-2024:6753", "cpe": "cpe:/o:redhat:rhel_e4s:8.6", "package": "kernel-0:4.18.0-372.123.1.el8_6", "product_name": "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions", "release_date": "2024-09-18T00:00:00Z"}, {"advisory": "RHSA-2024:6993", "cpe": "cpe:/o:redhat:rhel_eus:8.8", "package": "kernel-0:4.18.0-477.74.1.el8_8", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2024-09-24T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2024:9497", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "kernel-0:5.14.0-284.92.1.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-11-13T00:00:00Z"}, {"advisory": "RHSA-2024:9498", "cpe": "cpe:/a:redhat:rhel_eus:9.2::nfv", "package": "kernel-rt-0:5.14.0-284.92.1.rt14.377.el9_2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-11-13T00:00:00Z"}, {"advisory": "RHSA-2024:9546", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "kernel-0:5.14.0-427.44.1.el9_4", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2024-11-13T00:00:00Z"}], "bugzilla": {"description": "kernel: ext4: avoid allocating blocks from corrupted group in ext4_mb_find_by_goal()", "id": "2273242", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2273242"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-229", "details": ["In the Linux kernel, the following vulnerability has been resolved:\next4: avoid allocating blocks from corrupted group in ext4_mb_find_by_goal()\nPlaces the logic for checking if the group's block bitmap is corrupt under\nthe protection of the group lock to avoid allocating blocks from the group\nwith a corrupted block bitmap.", "A vulnerability was found in the ext4_mb_find_by_goal() function in the Linux kernel. This issue could lead to memory corruption or crashes due to the allocation of blocks from a group with a corrupted block bitmap."], "name": "CVE-2024-26772", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-04-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-26772\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26772\nhttps://lore.kernel.org/linux-cve-announce/2024040308-CVE-2024-26772-5168@gregkh/T"], "threat_severity": "Moderate"}

{}