CVE-2025-38018

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No local access is needed, matching the established kTLS scoring convention (CVE-2025-38471, CVE-2025-40176, CVE-2025-39946).\nAC:L - The attacker controls both required conditions: sending a TLS record header declaring a large payload followed by only a partial payload forces `inq < full_len` into `tls_strp_read_copy()`, and stalling the reader drives `tcp_rmem_pressure()` true so the allocation loop is entered \u2014 where `sk->sk_allocation` has been forced to `GFP_ATOMIC` by `tls_data_ready()`, making a 5-page order-0 failure readily inducible by spraying connections to exhaust atomic reserves. Repo precedent for allocation-failure NULL derefs (CVE-2025-40053) uses AC:L.\nPR:N - The strparser runs on every record received on a kTLS-RX socket, so any remote client that completes a standard server-authenticated TLS handshake with a kTLS-enabled server (nginx, HTTP/2, message brokers) can drive it without presenting any credentials to the target. No local account or capability is involved.\nUI:N - The crash is triggered entirely by the attacker's own packet stream arriving in the TCP receive softirq; no action by a local user or administrator is required.\nS:U - The NULL dereference occurs in kernel context and its effect is confined to the kernel of the affected host, crossing no VM, hypervisor, IOMMU, or other security-authority boundary.\nC:N - The fault is a dereference of a NULL `frag_list` at the fixed offset 0x28 (`TCP_SKB_CB(first)->seq`), a non-mappable low address under mmap_min_addr; no attacker-controlled data is read and nothing is copied back to userspace or the peer.\nI:N - No memory is written or corrupted \u2014 the stale anchor retains `len`/`data_len` with zero frags, which only makes `skb_copy_bits()` return `-EFAULT`, and the detached pointer is NULL rather than dangling, so there is no write or control-flow primitive.\nA:H - The NULL dereference occurs in softirq context inside `tcp_rcv_established()`, producing a fatal exception in interrupt that panics the machine (and guarantees reboot where `panic_on_oops` is set, as on Android and embedded builds), as reflected in the commit title \"fix kernel panic when alloc_page failed.\""}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/tls/tls_strp.c"], "versions": [{"version": "84c61fe1a75b4255df1e1e7c054c9e6d048da417", "lessThan": "8f7f96549bc55e4ef3a6b499bc5011e5de2f46c4", "status": "affected", "versionType": "git"}, {"version": "84c61fe1a75b4255df1e1e7c054c9e6d048da417", "lessThan": "406d05da26835943568e61bb751c569efae071d4", "status": "affected", "versionType": "git"}, {"version": "84c61fe1a75b4255df1e1e7c054c9e6d048da417", "lessThan": "a11b8c0be6acd0505a58ff40d474bd778b25b93a", "status": "affected", "versionType": "git"}, {"version": "84c61fe1a75b4255df1e1e7c054c9e6d048da417", "lessThan": "5f1f833cb388592bb46104463a1ec1b7c41975b6", "status": "affected", "versionType": "git"}, {"version": "84c61fe1a75b4255df1e1e7c054c9e6d048da417", "lessThan": "491deb9b8c4ad12fe51d554a69b8165b9ef9429f", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/tls/tls_strp.c"], "versions": [{"version": "6.0", "status": "affected"}, {"version": "0", "lessThan": "6.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.140", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.92", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.30", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.14.8", "lessThanOrEqual": "6.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15", "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": "6.0", "versionEndExcluding": "6.1.140"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.6.92"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.12.30"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.14.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8f7f96549bc55e4ef3a6b499bc5011e5de2f46c4"}, {"url": "https://git.kernel.org/stable/c/406d05da26835943568e61bb751c569efae071d4"}, {"url": "https://git.kernel.org/stable/c/a11b8c0be6acd0505a58ff40d474bd778b25b93a"}, {"url": "https://git.kernel.org/stable/c/5f1f833cb388592bb46104463a1ec1b7c41975b6"}, {"url": "https://git.kernel.org/stable/c/491deb9b8c4ad12fe51d554a69b8165b9ef9429f"}], "title": "net/tls: fix kernel panic when alloc_page failed", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:58:19.276Z"}}]}}

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No se puede establecer frag_list como un puntero nulo cuando alloc_page falla. Se usar\u00e1 en tls_strp_check_queue_ok la pr\u00f3xima vez que se invoque tls_strp_read_sock. Esto se debe a que no se restablece full_len en tls_strp_flush_anchor_copy(), por lo que la ruta de recepci\u00f3n intentar\u00e1 continuar gestionando el registro parcial en la siguiente llamada, pero se ha desvinculado el rcvq de la lista de fragmentos. Una soluci\u00f3n alternativa ser\u00eda restablecer full_len. No se puede manejar la desreferencia del puntero NULL del kernel en la direcci\u00f3n virtual 0000000000000028 Rastreo de llamadas: tls_strp_check_rcv+0x128/0x27c tls_strp_data_ready+0x34/0x44 tls_data_ready+0x3c/0x1f0 tcp_data_ready+0x9c/0xe4 tcp_data_queue+0xf6c/0x12d0 tcp_rcv_established+0x52c/0x798"}], "id": "CVE-2025-38018", "lastModified": "2026-07-30T06:22:44.607", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-06-18T10:15:33.433", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/406d05da26835943568e61bb751c569efae071d4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/491deb9b8c4ad12fe51d554a69b8165b9ef9429f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5f1f833cb388592bb46104463a1ec1b7c41975b6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8f7f96549bc55e4ef3a6b499bc5011e5de2f46c4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a11b8c0be6acd0505a58ff40d474bd778b25b93a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net/tls: fix kernel panic when alloc_page failed", "id": "2373355", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2373355"}, "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/tls: fix kernel panic when alloc_page failed\nWe cannot set frag_list to NULL pointer when alloc_page failed.\nIt will be used in tls_strp_check_queue_ok when the next time\ntls_strp_read_sock is called.\nThis is because we don't reset full_len in tls_strp_flush_anchor_copy()\nso the recv path will try to continue handling the partial record\non the next call but we dettached the rcvq from the frag list.\nAlternative fix would be to reset full_len.\nUnable to handle kernel NULL pointer dereference\nat virtual address 0000000000000028\nCall trace:\ntls_strp_check_rcv+0x128/0x27c\ntls_strp_data_ready+0x34/0x44\ntls_data_ready+0x3c/0x1f0\ntcp_data_ready+0x9c/0xe4\ntcp_data_queue+0xf6c/0x12d0\ntcp_rcv_established+0x52c/0x798"], "name": "CVE-2025-38018", "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": "2025-06-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-38018\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-38018\nhttps://lore.kernel.org/linux-cve-announce/2025061845-CVE-2025-38018-0c91@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-06-23T08:53:47.635555+00:00", "updated": "2025-06-23T08:53:47.635603+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}