{"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"}}]}}