{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38018", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.977Z", "datePublished": "2025-06-18T09:28:26.443Z", "dateUpdated": "2026-08-05T11:58:59.906Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:58:59.906Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/tls: fix kernel panic when alloc_page failed\n\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.\n\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.\n\nUnable to handle kernel NULL pointer dereference\nat virtual address 0000000000000028\n Call trace:\n tls_strp_check_rcv+0x128/0x27c\n tls_strp_data_ready+0x34/0x44\n tls_data_ready+0x3c/0x1f0\n tcp_data_ready+0x9c/0xe4\n tcp_data_queue+0xf6c/0x12d0\n tcp_rcv_established+0x52c/0x798" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The entire code path is driven by data received from the remote TLS peer — `tcp_rcv_established → tcp_data_queue → tcp_data_ready → tls_data_ready → tls_strp_data_ready → tls_strp_check_rcv → tls_strp_read_sock` — and the remote peer controls the TLS record framing and TCP segmentation that force the buggy `tls_strp_read_copy()` path. 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 — 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 — 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" } } ] } }