CVE-2025-39673

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When ppp_unregister_channel() is called,\n pch->chan is set to NULL before pch is removed from ppp->channels.\n\nFix these by using a lockless RCU approach:\n- Use list_first_or_null_rcu() to safely test and access the first list\n entry.\n- Convert list modifications on ppp->channels to their RCU variants and\n add synchronize_net() after removal.\n- Check for a NULL pch->chan before dereferencing it."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The race's teardown side is reachable from received packets \u2014 an unauthenticated spoofed PPPoE PADT frame drives `pppoe_disc_rcv()` \u2192 `ppp_unregister_channel()`, and remote L2TP/PPTP peers drive the same teardown over routed IP \u2014 while the reader side is triggered by ordinary forwarded traffic entering the nftables flowtable/HW-offload path from any remote host.\nAC:L - The attacker controls both sides of the race and can retry indefinitely: repeated session teardowns concurrently with a stream of new forwarded connections that each invoke `ppp_fill_forward_path()`, on a widely deployed default configuration (PPPoE/L2TP WAN plus flow offload).\nPR:N - PADT injection requires no credentials whatsoever (`pppoe_disc_rcv()` matches only session-id and source MAC, both observable), and generating forwarded traffic requires none; even the local variant only needs CAP_NET_ADMIN, which is obtainable unprivileged via user namespaces.\nUI:N - No victim action is needed \u2014 the attacker supplies both the teardown trigger and the forwarded traffic; PPP session teardown on remote protocol messages is automatic daemon behaviour, not user interaction.\nS:U - The corruption and its consequences are confined to the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The commit states `list_first_entry()` may return \"a freed entry\", giving a use-after-free read of a `struct channel` slab object, and the empty-head case yields an unbounded wild-pointer read through `chan->ops`, both usable to disclose arbitrary kernel memory.\nI:H - The UAF terminates in an indirect call through `chan->ops->fill_forward_path`, so an attacker who reclaims the freed `struct channel` allocation with sprayed data controls the function pointer, yielding control-flow hijack rather than a mere read.\nA:H - The commit explicitly says the list race will \"trigger a panic\", and the second race is an outright NULL dereference on `chan->ops` \u2014 either way a remotely reproducible kernel oops on a router in the forwarding fast path."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ppp/ppp_generic.c"], "versions": [{"version": "f6efc675c9dd8d93f826b79ae7e33e03301db609", "lessThan": 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even the local variant only needs CAP_NET_ADMIN, which is obtainable unprivileged via user namespaces.\nUI:N - No victim action is needed \u2014 the attacker supplies both the teardown trigger and the forwarded traffic; PPP session teardown on remote protocol messages is automatic daemon behaviour, not user interaction.\nS:U - The corruption and its consequences are confined to the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The commit states `list_first_entry()` may return \"a freed entry\", giving a use-after-free read of a `struct channel` slab object, and the empty-head case yields an unbounded wild-pointer read through `chan->ops`, both usable to disclose arbitrary kernel memory.\nI:H - The UAF terminates in an indirect call through `chan->ops->fill_forward_path`, so an attacker who reclaims the freed `struct channel` allocation with sprayed data controls the function pointer, yielding control-flow hijack rather than a mere read.\nA:H - The commit explicitly says the list race will \"trigger a panic\", and the second race is an outright NULL dereference on `chan->ops` \u2014 either way a remotely reproducible kernel oops on a router in the forwarding fast path."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "f6efc675c9dd8d93f826b79ae7e33e03301db609", "lessThan": "9a1969fbffc1f1900d92d7594b1b7d8d72ef3dc7", "versionType": "git"}, {"status": "affected", "version": "f6efc675c9dd8d93f826b79ae7e33e03301db609", "lessThan": "0f1630be6fcca3f0c63e4b242ad202e5cde28a40", "versionType": "git"}, {"status": "affected", "version": "f6efc675c9dd8d93f826b79ae7e33e03301db609", "lessThan": "ca18d751bcc9faf5b7e82e9fae1223d103928181", "versionType": "git"}, {"status": "affected", "version": "f6efc675c9dd8d93f826b79ae7e33e03301db609", "lessThan": "94731cc551e29511d85aa8dec61a6c071b1f2430", "versionType": "git"}, {"status": "affected", "version": "f6efc675c9dd8d93f826b79ae7e33e03301db609", "lessThan": "f97f6475fdcb3c28ff3c55cc4b7bde632119ec08", "versionType": "git"}, {"status": "affected", "version": "f6efc675c9dd8d93f826b79ae7e33e03301db609", "lessThan": "0417adf367a0af11adf7ace849af4638cfb573f7", "versionType": "git"}], "programFiles": ["drivers/net/ppp/ppp_generic.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.13"}, {"status": "unaffected", "version": "0", "lessThan": "5.13", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.190", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.149", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.103", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.44", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.16.4", "versionType": "semver", "lessThanOrEqual": "6.16.*"}, {"status": "unaffected", "version": "6.17", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/net/ppp/ppp_generic.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/9a1969fbffc1f1900d92d7594b1b7d8d72ef3dc7"}, {"url": "https://git.kernel.org/stable/c/0f1630be6fcca3f0c63e4b242ad202e5cde28a40"}, {"url": "https://git.kernel.org/stable/c/ca18d751bcc9faf5b7e82e9fae1223d103928181"}, {"url": "https://git.kernel.org/stable/c/94731cc551e29511d85aa8dec61a6c071b1f2430"}, {"url": "https://git.kernel.org/stable/c/f97f6475fdcb3c28ff3c55cc4b7bde632119ec08"}, {"url": "https://git.kernel.org/stable/c/0417adf367a0af11adf7ace849af4638cfb573f7"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nppp: fix race conditions in ppp_fill_forward_path\n\nppp_fill_forward_path() has two race conditions:\n\n1. 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When ppp_unregister_channel() is called,\n pch->chan is set to NULL before pch is removed from ppp->channels.\n\nFix these by using a lockless RCU approach:\n- Use list_first_or_null_rcu() to safely test and access the first list\n entry.\n- Convert list modifications on ppp->channels to their RCU variants and\n add synchronize_net() after removal.\n- Check for a NULL pch->chan before dereferencing it."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.190", "versionStartIncluding": "5.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.149", "versionStartIncluding": "5.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.103", "versionStartIncluding": "5.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.44", "versionStartIncluding": "5.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.16.4", "versionStartIncluding": "5.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.17", "versionStartIncluding": "5.13"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:04:28.071Z"}}}, "cveMetadata": {"cveId": "CVE-2025-39673", "state": "PUBLISHED", "dateUpdated": "2026-10-15T22:02:29.786Z", "dateReserved": "2025-04-16T07:20:57.112Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-09-05T17:20:38.769Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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The ppp->channels list can change between list_empty() and\n list_first_entry(), as ppp_lock() is not held. If the only channel\n is deleted in ppp_disconnect_channel(), list_first_entry() may\n access an empty head or a freed entry, and trigger a panic.\n\n2. pch->chan can be NULL. When ppp_unregister_channel() is called,\n pch->chan is set to NULL before pch is removed from ppp->channels.\n\nFix these by using a lockless RCU approach:\n- Use list_first_or_null_rcu() to safely test and access the first list\n entry.\n- Convert list modifications on ppp->channels to their RCU variants and\n add synchronize_net() after removal.\n- Check for a NULL pch->chan before dereferencing it."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nppp: corregir condiciones de carrera en ppp_fill_forward_path\n\nppp_fill_forward_path() tiene dos condiciones de carrera:\n\n1. La lista ppp->channels puede cambiar entre list_empty() y list_first_entry(), ya que ppp_lock() no est\u00e1 retenido. Si el \u00fanico canal es eliminado en ppp_disconnect_channel(), list_first_entry() puede acceder a una cabecera vac\u00eda o a una entrada liberada, y desencadenar un p\u00e1nico.\n\n2. pch->chan puede ser NULL. Cuando se llama a ppp_unregister_channel(), pch->chan se establece en NULL antes de que pch sea eliminado de ppp->channels.\n\nCorregir esto utilizando un enfoque RCU sin bloqueo:\n- Usar list_first_or_null_rcu() para probar y acceder de forma segura a la primera entrada de la lista.\n- Convertir las modificaciones de la lista en ppp->channels a sus variantes RCU y a\u00f1adir synchronize_net() despu\u00e9s de la eliminaci\u00f3n.\n- Comprobar si pch->chan es NULL antes de desreferenciarlo."}], "id": "CVE-2025-39673", "lastModified": "2026-10-19T21:10:00.160", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-39673", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:53:10.266228Z", "version": "2.0.3"}}]}, "published": "2025-09-05T18:15:43.230", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0417adf367a0af11adf7ace849af4638cfb573f7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0f1630be6fcca3f0c63e4b242ad202e5cde28a40"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/94731cc551e29511d85aa8dec61a6c071b1f2430"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9a1969fbffc1f1900d92d7594b1b7d8d72ef3dc7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ca18d751bcc9faf5b7e82e9fae1223d103928181"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f97f6475fdcb3c28ff3c55cc4b7bde632119ec08"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.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: ppp: fix race conditions in ppp_fill_forward_path", "id": "2393510", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2393510"}, "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": ["No description is available for this CVE."], "name": "CVE-2025-39673", "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": "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": "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": "2025-09-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-39673\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-39673\nhttps://lore.kernel.org/linux-cve-announce/2025090544-CVE-2025-39673-61bb@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-09-07T15:24:58.063519+00:00", "updated": "2025-09-07T15:24:58.063623+00:00", "vendors": ["linux", "linux$PRODUCT$linux", "linux$PRODUCT$linux_kernel"]}