CVE-2025-38204

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There is no network or remote-peer input path into jfs_readdir()/add_missing_indices().\nAC:L - Every controlling value \u2014 the negative stbl[] entries, the starting slot in the dir_table entry that makes readdir skip them, the out-of-range d->index that sets fix_page, and next_index \u2014 is read verbatim from the attacker's image, so the out-of-bounds access is fully deterministic with no race, timing, or memory-layout condition outside the attacker's control.\nPR:N - The attacker only has to author the filesystem image and needs no account or privilege on the target; once mounted, the vulnerable path is reached by an unprivileged readdir with no capable() or permission check anywhere between the syscall and add_missing_indices().\nUI:R - A user or an automounter on the victim system must mount the malicious JFS image read-write before the corrupted dtree page is ever ingested; on a desktop the file manager then issues the getdents that trips the bug without further action.\nS:U - The out-of-bounds read, the out-of-bounds write, and the corrupted journal records are all confined to the kernel's own security authority on the affected host; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The negative index reads kernel memory up to 4064 bytes before the metapage folio, and because lv->offset is u8 the same value makes lmWriteRecord() memcpy 32 bytes from up to 4064 bytes past the metapage into the journal, persisting kernel heap contents onto storage the attacker supplied and can read back \u2014 far beyond a bounded few-byte read.\nI:H - When the out-of-bounds-read d->index fails the (2 <= index < next_index) test \u2014 which arbitrary adjacent heap data almost always does \u2014 the code performs a 4-byte out-of-bounds write of add_index()'s return value at an attacker-chosen 32-byte-aligned offset among 128 possible slots before the metapage, giving a groomable heap corruption primitive in addition to the bogus linelock that corrupts the on-disk journal.\nA:H - The wild read and write reach adjacent page-cache folios and other kernel allocations, producing a KASAN report/oops or corrupting live kernel structures, and the malformed journal line-vector writes garbage into the log; the attacker can repeat the readdir arbitrarily, so a kernel panic is readily achievable."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/jfs/jfs_dtree.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "81af4b34fd72d390d7f237c6a545cc6d09707956", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "bfa4655d28f338e68d345aed80d19be7999bbce2", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "44618bee303bed151ef3a525ff79fbd7689593b5", "status": "affected", 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El stbl es s8, pero debe contener desplazamientos en la ranura, que pueden ir de 0 a 127. Se a\u00f1adi\u00f3 una comprobaci\u00f3n de l\u00edmite para ese error y se devuelve -EIO si la comprobaci\u00f3n falla. Tambi\u00e9n se hace que jfs_readdir devuelva un error si add_missing_indices devuelve un error."}], "id": "CVE-2025-38204", "lastModified": "2026-10-30T13:18:01.620", "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"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-07-04T14:15:28.383", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2ec34dc7094b14149ce091c77aff43a45d255518"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/44618bee303bed151ef3a525ff79fbd7689593b5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5730e2da0655336fed6aa3c25892e69e2ba5cb76"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5dff41a86377563f7a2b968aae00d25b4ceb37c9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/81af4b34fd72d390d7f237c6a545cc6d09707956"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bfa4655d28f338e68d345aed80d19be7999bbce2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c8399564a58fb6ea2ff21a6fd278417943cb51a5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c8733634978086b41255695d993cec3017a23a27"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: jfs: fix array-index-out-of-bounds read in add_missing_indices", "id": "2376408", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2376408"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\njfs: fix array-index-out-of-bounds read in add_missing_indices\nstbl is s8 but it must contain offsets into slot which can go from 0 to\n127.\nAdded a bound check for that error and return -EIO if the check fails.\nAlso make jfs_readdir return with error if add_missing_indices returns\nwith an error."], "name": "CVE-2025-38204", "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": "2025-07-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38204\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38204\nhttps://lore.kernel.org/linux-cve-announce/2025070419-CVE-2025-38204-c216@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-13T21:47:54.563869+00:00", "updated": "2025-07-13T21:47:54.563917+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}