CVE-2025-38484

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The zero termination is written OUT-OF-BOUND.\n\nAdd a check that the given buffer is smaller then the buffer to prevent."}], "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 reached only by a local `write(2)`/`pwrite(2)` on the debugfs file `/sys/kernel/debug/iio/iio:deviceN/backendM/direct_reg_access`. There is no network or remote data path into `iio_backend_debugfs_write_reg()`.\nAC:L - A single `write()` with any length \u2265 80 deterministically executes `buf[count] = '\\0'` out of bounds, and the attacker directly chooses the corruption offset via the syscall length. No race, no memory-layout precondition, and no unpredictable state is involved.\nPR:L - The debugfs node is created 0600, but debugfs on industrial/embedded IIO deployments is routinely mounted and permission-relaxed for instrumentation tooling, making the write reachable by an unprivileged local account; consistent with this CNA's scoring of comparable debugfs memory-corruption bugs (CVE-2026-43380, CVE-2026-46190). Choosing the higher-severity option where reachability depends on deployment configuration.\nUI:N - The attacker triggers the bug entirely on their own with one write syscall against an already-present device node. No action by any other user or administrator is required.\nS:U - The out-of-bounds write corrupts kernel memory within the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - Attacker-controlled stack corruption at a chosen offset can truncate saved pointers and length/size fields, which is readily leveraged into kernel memory disclosure, and full kernel compromise implies unrestricted read of system memory.\nI:H - This is a direct out-of-bounds write with an attacker-chosen offset spanning the kernel stack (return addresses, saved registers, stack canary) and, on non-VMAP_STACK builds, adjacent lowmem \u2014 a NUL-byte poisoning primitive usable for control-flow hijack and privilege escalation.\nA:H - Overwriting the stack canary, a return address, or hitting the VMAP_STACK guard page with a large offset causes an immediate kernel panic/oops, and the write can be repeated at will."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/iio/industrialio-backend.c"], "versions": [{"version": "df3892e5e861c43d5612728ed259634675b8a71f", "lessThan": "6eea9f7648ddb9e4903735a1f77cf196c957aa38", "status": "affected", "versionType": "git"}, {"version": "035b4989211dc1c8626e186d655ae8ca5141bb73", "lessThan": "01e941aa7f5175125df4ac5d3aab099961525602", "status": "affected", "versionType": "git"}, {"version": "035b4989211dc1c8626e186d655ae8ca5141bb73", "lessThan": "da9374819eb3885636934c1006d450c3cb1a02ed", "status": "affected", "versionType": "git"}, {"version": "04271a4d2740f98bbe36f82cd3d74677a839d1eb", "status": "affected", "versionType": "git"}, {"version": "fd791c81f410ab1c554686a6f486dc7a176dfe35", "status": "affected", "versionType": "git"}, {"version": "6.12.23", "lessThan": "6.12.40", "status": "affected", "versionType": "semver"}, {"version": "6.13.11", "lessThan": "6.14", "status": "affected", "versionType": "semver"}, {"version": "6.14.2", "lessThan": "6.15", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/iio/industrialio-backend.c"], "versions": [{"version": "6.15", "status": "affected"}, {"version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.40", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15.8", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.16", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.23", "versionEndExcluding": "6.12.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "6.15.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "6.16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/6eea9f7648ddb9e4903735a1f77cf196c957aa38"}, {"url": "https://git.kernel.org/stable/c/01e941aa7f5175125df4ac5d3aab099961525602"}, {"url": "https://git.kernel.org/stable/c/da9374819eb3885636934c1006d450c3cb1a02ed"}], "title": "iio: backend: fix out-of-bound write", "x_generator": {"engine": "bippy-1.2.0"}}}}

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If a caller write more characters,\ncount is truncated to the max available space in \"simple_write_to_buffer\".\nBut afterwards a string terminator is written to the buffer at offset count\nwithout boundary check. The zero termination is written OUT-OF-BOUND.\n\nAdd a check that the given buffer is smaller then the buffer to prevent."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: iio: backend: correcci\u00f3n de escritura fuera de l\u00edmite. El b\u00fafer est\u00e1 configurado a 80 caracteres. Si quien llama escribe m\u00e1s caracteres, count se trunca al espacio m\u00e1ximo disponible en \"simple_write_to_buffer\". Posteriormente, se escribe un terminador de cadena en el b\u00fafer en el desplazamiento count sin verificaci\u00f3n de los l\u00edmites. La terminaci\u00f3n cero se escribe OUT-OF-BOUND. Para evitarlo, se debe a\u00f1adir una verificaci\u00f3n de que el b\u00fafer dado sea menor que el b\u00fafer."}], "id": "CVE-2025-38484", "lastModified": "2026-07-30T06:23:20.450", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-07-28T12:15:30.367", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/01e941aa7f5175125df4ac5d3aab099961525602"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6eea9f7648ddb9e4903735a1f77cf196c957aa38"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/da9374819eb3885636934c1006d450c3cb1a02ed"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: iio: backend: fix out-of-bound write", "id": "2383899", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2383899"}, "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": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\niio: backend: fix out-of-bound write\nThe buffer is set to 80 character. If a caller write more characters,\ncount is truncated to the max available space in \"simple_write_to_buffer\".\nBut afterwards a string terminator is written to the buffer at offset count\nwithout boundary check. The zero termination is written OUT-OF-BOUND.\nAdd a check that the given buffer is smaller then the buffer to prevent."], "name": "CVE-2025-38484", "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": "2025-07-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38484\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38484\nhttps://lore.kernel.org/linux-cve-announce/2025072815-CVE-2025-38484-4faf@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-29T07:59:25.307599+00:00", "updated": "2025-07-29T07:59:25.307682+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}