CVE-2025-38107

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No remote peer input reaches `ets_qdisc_change()`.\nAC:L - The attacker controls both sides of the race \u2014 they configure the SFQ child's `perturb` period, choose when to issue the band-shrinking `tc` change, and can retry the sequence unboundedly until the timer lands in the unlocked window between `sch_tree_unlock()` and `qdisc_put()`.\nPR:L - The tc/qdisc netlink path is gated only by `netlink_net_capable(skb, CAP_NET_ADMIN)` against the netns' own user namespace, so an unprivileged user obtains it via `unshare -Urn` and can also autoload `sch_ets`/`sch_sfq` from that context.\nUI:N - The attacker performs every step \u2014 creating the qdisc hierarchy, generating traffic, and triggering the change \u2014 entirely on their own. No victim action is involved.\nS:U - The corrupted `qlen`/`backlog` accounting and any resulting memory corruption are confined to the kernel's own security authority; this is standard local kernel privilege escalation with no VM, IOMMU, or sandbox boundary crossed.\nC:H - The double-subtraction underflows an unsigned `q.qlen`, desynchronizing the qdisc tree so classes remain on active lists after their child qdiscs are freed, yielding a use-after-free on `struct Qdisc`/class objects that can be groomed into an arbitrary kernel-memory read.\nI:H - The same qlen-desync-to-UAF primitive gives control over reallocated heap objects and their function pointers/list heads, enabling arbitrary write and control-flow hijacking \u2014 the well-known net/sched local privilege escalation pattern.\nA:H - Even unweaponized, the underflowed `qlen` makes an empty qdisc appear to hold ~4 billion packets, causing dequeue-from-empty warnings, stuck transmit paths, and use-after-free oopses that panic the kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/sch_ets.c"], "versions": [{"version": "699d82e9a6db29d509a71f1f2f4316231e6232e6", "lessThan": "eb7b74e9754e1ba2088f914ad1f57a778b11894b", "status": "affected", "versionType": "git"}, {"version": "ce881ddbdc028fb1988b66e40e45ca0529c23b46", "lessThan": "0b479d0aa488cb478eb2e1d8868be946ac8afb4f", "status": "affected", "versionType": "git"}, {"version": "b05972f01e7d30419987a1f221b5593668fd6448", "lessThan": "347867cb424edae5fec1622712c8dd0a2c42918f", "status": "affected", "versionType": "git"}, {"version": "b05972f01e7d30419987a1f221b5593668fd6448", "lessThan": "0383b25488a545be168744336847549d4a2d3d6c", "status": "affected", "versionType": "git"}, {"version": "b05972f01e7d30419987a1f221b5593668fd6448", "lessThan": "073f64c03516bcfaf790f8edc772e0cfb8a84ec3", "status": "affected", 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in ets_qdisc_change()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:34:09.673Z"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-38107", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:47:26.074069Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:52:08.363Z"}}]}}

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No remote peer input reaches `ets_qdisc_change()`.\nAC:L - The attacker controls both sides of the race \u2014 they configure the SFQ child's `perturb` period, choose when to issue the band-shrinking `tc` change, and can retry the sequence unboundedly until the timer lands in the unlocked window between `sch_tree_unlock()` and `qdisc_put()`.\nPR:L - The tc/qdisc netlink path is gated only by `netlink_net_capable(skb, CAP_NET_ADMIN)` against the netns' own user namespace, so an unprivileged user obtains it via `unshare -Urn` and can also autoload `sch_ets`/`sch_sfq` from that context.\nUI:N - The attacker performs every step \u2014 creating the qdisc hierarchy, generating traffic, and triggering the change \u2014 entirely on their own. No victim action is involved.\nS:U - The corrupted `qlen`/`backlog` accounting and any resulting memory corruption are confined to the kernel's own security authority; this is standard local kernel privilege escalation with no VM, IOMMU, or sandbox boundary crossed.\nC:H - The double-subtraction underflows an unsigned `q.qlen`, desynchronizing the qdisc tree so classes remain on active lists after their child qdiscs are freed, yielding a use-after-free on `struct Qdisc`/class objects that can be groomed into an arbitrary kernel-memory read.\nI:H - The same qlen-desync-to-UAF primitive gives control over reallocated heap objects and their function pointers/list heads, enabling arbitrary write and control-flow hijacking \u2014 the well-known net/sched local privilege escalation pattern.\nA:H - Even unweaponized, the underflowed `qlen` makes an empty qdisc appear to hold ~4 billion packets, causing dequeue-from-empty warnings, stuck transmit paths, and use-after-free oopses that panic the 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follows:\n\nCPU 0 CPU 1\n[1]: lock root\n[2]: qdisc_tree_flush_backlog()\n[3]: unlock root\n |\n | [5]: lock root\n | [6]: rehash\n | [7]: qdisc_tree_reduce_backlog()\n |\n[4]: qdisc_put()\n\nThis can be abused to underflow a parent's qlen.\n\nCalling qdisc_purge_queue() instead of qdisc_tree_flush_backlog()\nshould fix the race, because all packets will be purged from the qdisc\nbefore releasing the lock."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.239", "versionStartIncluding": "5.10.142"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.186", "versionStartIncluding": "5.15.66"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.142", "versionStartIncluding": "6.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", 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been resolved:\n\nnet_sched: ets: fix a race in ets_qdisc_change()\n\nGerrard Tai reported a race condition in ETS, whenever SFQ perturb timer\nfires at the wrong time.\n\nThe race is as follows:\n\nCPU 0 CPU 1\n[1]: lock root\n[2]: qdisc_tree_flush_backlog()\n[3]: unlock root\n |\n | [5]: lock root\n | [6]: rehash\n | [7]: qdisc_tree_reduce_backlog()\n |\n[4]: qdisc_put()\n\nThis can be abused to underflow a parent's qlen.\n\nCalling qdisc_purge_queue() instead of qdisc_tree_flush_backlog()\nshould fix the race, because all packets will be purged from the qdisc\nbefore releasing the lock."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net_sched: ets: corrige una ejecuci\u00f3n en ets_qdisc_change() Gerrard Tai inform\u00f3 de una condici\u00f3n de ejecuci\u00f3n en ETS, siempre que el temporizador de perturbaci\u00f3n SFQ se dispara en el momento equivocado. La ejecuci\u00f3n es la siguiente: CPU 0 CPU 1 [1]: ra\u00edz de bloqueo [2]: qdisc_tree_flush_backlog() [3]: ra\u00edz de desbloqueo | | [5]: ra\u00edz de bloqueo | [6]: rehash | [7]: qdisc_tree_reduce_backlog() | [4]: qdisc_put() Esto se puede abusar para desbordar el qlen de un padre. Llamar a qdisc_purge_queue() en lugar de qdisc_tree_flush_backlog() deber\u00eda corregir la ejecuci\u00f3n, porque todos los paquetes se purgar\u00e1n del qdisc antes de liberar el bloqueo."}], "id": "CVE-2025-38107", "lastModified": "2026-10-15T22:18:27.143", "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": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-38107", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:47:26.074069Z", "version": "2.0.3"}}]}, "published": "2025-07-03T09:15:24.273", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0383b25488a545be168744336847549d4a2d3d6c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/073f64c03516bcfaf790f8edc772e0cfb8a84ec3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0b479d0aa488cb478eb2e1d8868be946ac8afb4f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/347867cb424edae5fec1622712c8dd0a2c42918f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d92adacdd8c2960be856e0b82acc5b7c5395fddb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eb7b74e9754e1ba2088f914ad1f57a778b11894b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fed94bd51d62d2e0e006aa61480e94e5cd0582b0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net_sched: ets: fix a race in ets_qdisc_change()", "id": "2376059", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2376059"}, "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:\nnet_sched: ets: fix a race in ets_qdisc_change()\nGerrard Tai reported a race condition in ETS, whenever SFQ perturb timer\nfires at the wrong time.\nThe race is as follows:\nCPU 0 CPU 1\n[1]: lock root\n[2]: qdisc_tree_flush_backlog()\n[3]: unlock root\n|\n| [5]: lock root\n| [6]: rehash\n| [7]: qdisc_tree_reduce_backlog()\n|\n[4]: qdisc_put()\nThis can be abused to underflow a parent's qlen.\nCalling qdisc_purge_queue() instead of qdisc_tree_flush_backlog()\nshould fix the race, because all packets will be purged from the qdisc\nbefore releasing the lock."], "name": "CVE-2025-38107", "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": "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "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-2025-38107\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38107\nhttps://lore.kernel.org/linux-cve-announce/2025070323-CVE-2025-38107-9344@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-06T22:16:22.858741+00:00", "updated": "2025-07-06T22:16:22.858787+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}