CVE-2025-38101

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No remote or network-supplied data reaches `ring_buffer_subbuf_order_set()`.\nAC:L - The attacker owns both sides of the race \u2014 two threads writing `buffer_subbuf_size_kb` concurrently, with no `trace_types_lock` serializing `buffer_subbuf_size_write()` \u2014 and deterministically forces the unlocked `error:` path by mmap'ing a later CPU's `trace_pipe_raw` so `cpu_buffer->mapped` yields `-EBUSY` after earlier CPUs already allocated `new_pages`. The window spans a sleeping GFP_KERNEL allocation loop and a multi-page free loop whose length the attacker sets via `buffer_size_kb` and CPU count, and the attempt can be retried indefinitely.\nPR:L - No capability check exists anywhere on the path \u2014 `tracing_check_open_get_tr()` only tests `LOCKDOWN_TRACEFS` and `tracing_disabled` \u2014 so access is governed purely by tracefs DAC, which Android (`shell`, `traced_probes`/Perfetto), ChromeOS and observability/embedded deployments routinely delegate to ordinary non-root accounts and tracing groups. This matches the CNA's existing tracefs precedent (CVE-2025-38267, CVE-2025-68329, both PR:L).\nUI:N - The attacker performs the `mmap()` of `trace_pipe_raw` and both concurrent writes to `buffer_subbuf_size_kb` entirely from its own threads. No victim action, mount, or file open by another user is involved.\nS:U - The list corruption and freed-page reuse occur in the kernel's own ring-buffer allocations and stay within the host kernel's security authority. No VM, IOMMU, container, or sandbox boundary is crossed.\nC:H - The race leaves the live `cpu_buffer->pages` list pointing at `struct buffer_page` objects and order-N data pages that the other thread has already handed back via `kfree()`/`free_pages()`, so the ring buffer keeps reading from memory that the slab and page allocators have reissued to other kernel users. Reading `trace` or `trace_pipe_raw` then discloses the contents of those reallocated kernel objects.\nI:H - Concurrent `list_del_init()` against a re-initialized head produces list corruption plus double-free of both a kmalloc'd `struct buffer_page` and its `free_pages()` backing allocation \u2014 a classic heap-corruption primitive. Because `trace_marker` writes attacker-chosen bytes directly into ring-buffer data pages, the attacker can overwrite the freed-and-reallocated memory with controlled content, giving a write primitive usable for control-flow hijack.\nA:H - The corrupted linked list and double-free reliably oops the kernel \u2014 immediately under `CONFIG_DEBUG_LIST`, which turns the bad `__list_del_entry()` into a BUG, and otherwise through the subsequent `rb_check_pages()`/`rb_head_page_deactivate()` walk over freed pages. This was the syzbot-reported failure mode and the attacker can repeat it at will."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/ring_buffer.c"], "versions": [{"version": "f9b94daa542a8d2532f0930f01cd9aec2d19621b", "lessThan": "e09c0600beea469b3ebf974464e526a02d59ad62", "status": "affected", "versionType": "git"}, {"version": "f9b94daa542a8d2532f0930f01cd9aec2d19621b", "lessThan": "0fc9a295cd8e59c3636e97395e7c74a9c89fee42", "status": "affected", "versionType": "git"}, {"version": "f9b94daa542a8d2532f0930f01cd9aec2d19621b", "lessThan": "40ee2afafc1d9fe3aa44a6fbe440d78a5c96a72e", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/ring_buffer.c"], "versions": [{"version": "6.8", "status": "affected"}, {"version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.34", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15.3", "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": "6.8", "versionEndExcluding": "6.12.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.15.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.16"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/e09c0600beea469b3ebf974464e526a02d59ad62"}, {"url": "https://git.kernel.org/stable/c/0fc9a295cd8e59c3636e97395e7c74a9c89fee42"}, {"url": "https://git.kernel.org/stable/c/40ee2afafc1d9fe3aa44a6fbe440d78a5c96a72e"}], "title": "ring-buffer: Fix buffer locking in ring_buffer_subbuf_order_set()", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/trace/ring_buffer.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "e09c0600beea469b3ebf974464e526a02d59ad62", "status": "affected", "version": "f9b94daa542a8d2532f0930f01cd9aec2d19621b", "versionType": "git"}, {"lessThan": "0fc9a295cd8e59c3636e97395e7c74a9c89fee42", "status": "affected", "version": "f9b94daa542a8d2532f0930f01cd9aec2d19621b", "versionType": "git"}, {"lessThan": "40ee2afafc1d9fe3aa44a6fbe440d78a5c96a72e", "status": "affected", "version": "f9b94daa542a8d2532f0930f01cd9aec2d19621b", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/trace/ring_buffer.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.8"}, {"lessThan": "6.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.34", "versionType": "semver"}, {"lessThanOrEqual": "6.15.*", "status": "unaffected", "version": "6.15.3", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.16", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "15BC1D57-68F1-439E-BE58-136CEB32896A", "versionEndExcluding": "6.12.34", "versionStartIncluding": "6.8", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0541C761-BD5E-4C1A-8432-83B375D7EB92", "versionEndExcluding": "6.15.3", "versionStartIncluding": "6.13", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Fix buffer locking in ring_buffer_subbuf_order_set()\n\nEnlarge the critical section in ring_buffer_subbuf_order_set() to\nensure that error handling takes place with per-buffer mutex held,\nthus preventing list corruption and other concurrency-related issues."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ring-buffer: Se corrige el bloqueo del b\u00fafer en ring_buffer_subbuf_order_set() Se ampl\u00eda la secci\u00f3n cr\u00edtica en ring_buffer_subbuf_order_set() para garantizar que el manejo de errores se realice con el mutex por b\u00fafer retenido, evitando as\u00ed la corrupci\u00f3n de listas y otros problemas relacionados con la concurrencia."}], "id": "CVE-2025-38101", "lastModified": "2026-07-30T06:22:50.810", "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": "2025-07-03T09:15:23.573", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0fc9a295cd8e59c3636e97395e7c74a9c89fee42"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/40ee2afafc1d9fe3aa44a6fbe440d78a5c96a72e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e09c0600beea469b3ebf974464e526a02d59ad62"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ring-buffer: Fix buffer locking in ring_buffer_subbuf_order_set()", "id": "2376055", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2376055"}, "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:\nring-buffer: Fix buffer locking in ring_buffer_subbuf_order_set()\nEnlarge the critical section in ring_buffer_subbuf_order_set() to\nensure that error handling takes place with per-buffer mutex held,\nthus preventing list corruption and other concurrency-related issues."], "name": "CVE-2025-38101", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "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": "2025-07-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38101\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38101\nhttps://lore.kernel.org/linux-cve-announce/2025070321-CVE-2025-38101-56c1@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-06T22:16:21.536073+00:00", "updated": "2025-07-06T22:16:21.536123+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}