{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38471", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:24.021Z", "datePublished": "2025-07-28T11:21:32.927Z", "dateUpdated": "2026-08-05T12:02:10.110Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:02:10.110Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntls: always refresh the queue when reading sock\n\nAfter recent changes in net-next TCP compacts skbs much more\naggressively. This unearthed a bug in TLS where we may try\nto operate on an old skb when checking if all skbs in the\nqueue have matching decrypt state and geometry.\n\n BUG: KASAN: slab-use-after-free in tls_strp_check_rcv+0x898/0x9a0 [tls]\n (net/tls/tls_strp.c:436 net/tls/tls_strp.c:530 net/tls/tls_strp.c:544)\n Read of size 4 at addr ffff888013085750 by task tls/13529\n\n CPU: 2 UID: 0 PID: 13529 Comm: tls Not tainted 6.16.0-rc5-virtme\n Call Trace:\n kasan_report+0xca/0x100\n tls_strp_check_rcv+0x898/0x9a0 [tls]\n tls_rx_rec_wait+0x2c9/0x8d0 [tls]\n tls_sw_recvmsg+0x40f/0x1aa0 [tls]\n inet_recvmsg+0x1c3/0x1f0\n\nAlways reload the queue, fast path is to have the record in the queue\nwhen we wake, anyway (IOW the path going down \"if !strp->stm.full_len\")." } ], "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 vulnerable code is the kTLS receive strparser, driven directly from the TCP `sk_data_ready` softirq hook and from `recvmsg()` on data supplied by the remote TLS peer. A remote attacker triggers it purely by choosing TLS record framing and TCP segment sizes/timing on an ordinary connection to a kTLS-enabled service.\nAC:L - The attacker controls every side of the condition — the record header that sets `stm.full_len`, the many small/large segments that push `sk_rmem_alloc` past `sk_rcvbuf` to force `tcp_collapse()` to free the anchored skb, and the final segment that makes `inq >= full_len` — and can retry indefinitely across parallel connections. It was hit by the plain in-tree `tls` selftest, not an exotic race.\nPR:N - The attacker is the remote peer of a TLS connection and needs no account or privilege on the target; kTLS servers (nginx/HAProxy with kTLS offload, TLS-terminating proxies) accept connections from anonymous clients and enable `TLS_RX` right after the handshake.\nUI:N - The victim application merely receives data on an already-established kTLS socket; the strparser runs from softirq on packet arrival with no local user action required.\nS:U - The corruption is confined to kernel skb/slab memory of the affected host, with no crossing of a VM, IOMMU, or sandbox security authority.\nC:H - This is a slab use-after-free read: freed skb metadata is read, and the attacker-influenced `skb->next` chain lets the loop walk into reallocated memory, giving an arbitrary-address read oracle via the true/false result; freed pages are further fed into the AEAD scatterlist by `skb_to_sgvec()`.\nI:H - Use-after-free with heap grooming yields write primitives — `tls_strp_msg_hold()` performs `skb_clone()` on the freed skbs, writing refcounts into reallocated objects, and the stale `frag_list` drives crypto operations over freed memory, which is exploitable for control-flow hijacking.\nA:H - KASAN confirms a slab-use-after-free, and the unbounded `skb = skb->next` walk over freed memory readily faults on a wild pointer, producing a kernel oops/panic that a remote attacker can trigger repeatedly." } ] } ], "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": "0d87bbd39d7fd1135ab9eca672d760470f6508e8", "lessThan": "730fed2ff5e259495712518e18d9f521f61972bb", "status": "affected", "versionType": "git" }, { "version": "0d87bbd39d7fd1135ab9eca672d760470f6508e8", "lessThan": "1f3a429c21e0e43e8b8c55d30701e91411a4df02", "status": "affected", "versionType": "git" }, { "version": "0d87bbd39d7fd1135ab9eca672d760470f6508e8", "lessThan": "cdb767915fc9a15d88d19d52a1455f1dc3e5ddc8", "status": "affected", "versionType": "git" }, { "version": "0d87bbd39d7fd1135ab9eca672d760470f6508e8", "lessThan": "c76f6f437c46b2390888e0e1dc7aafafa9f4e0c6", "status": "affected", "versionType": "git" }, { "version": "0d87bbd39d7fd1135ab9eca672d760470f6508e8", "lessThan": "4ab26bce3969f8fd925fe6f6f551e4d1a508c68b", "status": "affected", "versionType": "git" }, { "version": "2277d7cbdf47531b2c3cd01ba15255fa955aab35", "status": "affected", "versionType": "git" }, { "version": "6.0.6", "lessThan": "6.1", "status": "affected", "versionType": "semver" } ] }, { "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": "6.1", "status": "affected" }, { "version": "0", "lessThan": "6.1", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.147", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.100", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.40", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15.8", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16", "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": "6.1", "versionEndExcluding": "6.1.147" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.6.100" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.12.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.15.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0.6" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/730fed2ff5e259495712518e18d9f521f61972bb" }, { "url": "https://git.kernel.org/stable/c/1f3a429c21e0e43e8b8c55d30701e91411a4df02" }, { "url": "https://git.kernel.org/stable/c/cdb767915fc9a15d88d19d52a1455f1dc3e5ddc8" }, { "url": "https://git.kernel.org/stable/c/c76f6f437c46b2390888e0e1dc7aafafa9f4e0c6" }, { "url": "https://git.kernel.org/stable/c/4ab26bce3969f8fd925fe6f6f551e4d1a508c68b" } ], "title": "tls: always refresh the queue when reading sock", "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" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:38:36.234Z" } }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-07-14T12:42:10.201Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html" } ] } ] } }