{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-39828", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.140Z", "datePublished": "2025-09-16T13:00:26.433Z", "dateUpdated": "2026-05-12T12:07:23.938Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:37:13.336Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\natm: atmtcp: Prevent arbitrary write in atmtcp_recv_control().\n\nsyzbot reported the splat below. [0]\n\nWhen atmtcp_v_open() or atmtcp_v_close() is called via connect()\nor close(), atmtcp_send_control() is called to send an in-kernel\nspecial message.\n\nThe message has ATMTCP_HDR_MAGIC in atmtcp_control.hdr.length.\nAlso, a pointer of struct atm_vcc is set to atmtcp_control.vcc.\n\nThe notable thing is struct atmtcp_control is uAPI but has a\nspace for an in-kernel pointer.\n\n struct atmtcp_control {\n \tstruct atmtcp_hdr hdr;\t/* must be first */\n ...\n \tatm_kptr_t vcc;\t\t/* both directions */\n ...\n } __ATM_API_ALIGN;\n\n typedef struct { unsigned char _[8]; } __ATM_API_ALIGN atm_kptr_t;\n\nThe special message is processed in atmtcp_recv_control() called\nfrom atmtcp_c_send().\n\natmtcp_c_send() is vcc->dev->ops->send() and called from 2 paths:\n\n 1. .ndo_start_xmit() (vcc->send() == atm_send_aal0())\n 2. vcc_sendmsg()\n\nThe problem is sendmsg() does not validate the message length and\nuserspace can abuse atmtcp_recv_control() to overwrite any kptr\nby atmtcp_control.\n\nLet's add a new ->pre_send() hook to validate messages from sendmsg().\n\n[0]:\nOops: general protection fault, probably for non-canonical address 0xdffffc00200000ab: 0000 [#1] SMP KASAN PTI\nKASAN: probably user-memory-access in range [0x0000000100000558-0x000000010000055f]\nCPU: 0 UID: 0 PID: 5865 Comm: syz-executor331 Not tainted 6.17.0-rc1-syzkaller-00215-gbab3ce404553 #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025\nRIP: 0010:atmtcp_recv_control drivers/atm/atmtcp.c:93 [inline]\nRIP: 0010:atmtcp_c_send+0x1da/0x950 drivers/atm/atmtcp.c:297\nCode: 4d 8d 75 1a 4c 89 f0 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 15 06 00 00 41 0f b7 1e 4d 8d b7 60 05 00 00 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 13 06 00 00 66 41 89 1e 4d 8d 75 1c 4c\nRSP: 0018:ffffc90003f5f810 EFLAGS: 00010203\nRAX: 00000000200000ab RBX: 0000000000000000 RCX: 0000000000000000\nRDX: ffff88802a510000 RSI: 00000000ffffffff RDI: ffff888030a6068c\nRBP: ffff88802699fb40 R08: ffff888030a606eb R09: 1ffff1100614c0dd\nR10: dffffc0000000000 R11: ffffffff8718fc40 R12: dffffc0000000000\nR13: ffff888030a60680 R14: 000000010000055f R15: 00000000ffffffff\nFS: 00007f8d7e9236c0(0000) GS:ffff888125c1c000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 000000000045ad50 CR3: 0000000075bde000 CR4: 00000000003526f0\nCall Trace:\n \n vcc_sendmsg+0xa10/0xc60 net/atm/common.c:645\n sock_sendmsg_nosec net/socket.c:714 [inline]\n __sock_sendmsg+0x219/0x270 net/socket.c:729\n ____sys_sendmsg+0x505/0x830 net/socket.c:2614\n ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668\n __sys_sendmsg net/socket.c:2700 [inline]\n __do_sys_sendmsg net/socket.c:2705 [inline]\n __se_sys_sendmsg net/socket.c:2703 [inline]\n __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f8d7e96a4a9\nCode: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f8d7e923198 EFLAGS: 00000246 ORIG_RAX: 000000000000002e\nRAX: ffffffffffffffda RBX: 00007f8d7e9f4308 RCX: 00007f8d7e96a4a9\nRDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000005\nRBP: 00007f8d7e9f4300 R08: 65732f636f72702f R09: 65732f636f72702f\nR10: 65732f636f72702f R11: 0000000000000246 R12: 00007f8d7e9c10ac\nR13: 00007f8d7e9231a0 R14: 0000200000000200 R15: 0000200000000250\n \nModules linked in:" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/atm/atmtcp.c", "include/linux/atmdev.h", "net/atm/common.c" ], "versions": [ { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "b502f16bad8f0a4cfbd023452766f21bfda39dde", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "0a6a6d4fb333f7afe22e59ffed18511a7a98efc8", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "62f368472b0aa4b5d91d9b983152855c6b6d8925", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "51872b26429077be611b0a1816e0e722278015c3", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "3c80c230d6e3e6f63d43f4c3f0bb344e3e8b119b", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "33f9e6dc66b32202b95fc861e6b3ea4b0c185b0b", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "3ab9f5ad9baefe6d3d4c37053cdfca2761001dfe", "status": "affected", "versionType": "git" }, { "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "ec79003c5f9d2c7f9576fc69b8dbda80305cbe3a", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/atm/atmtcp.c", "include/linux/atmdev.h", "net/atm/common.c" ], "versions": [ { "version": "2.6.12", "status": "affected" }, { "version": "0", "lessThan": "2.6.12", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.298", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.242", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.191", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.150", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.104", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.45", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16.5", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.17", "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": "2.6.12", "versionEndExcluding": "5.4.298" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.10.242" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "5.15.191" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.1.150" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.6.104" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.12.45" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.16.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.12", "versionEndExcluding": "6.17" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/b502f16bad8f0a4cfbd023452766f21bfda39dde" }, { "url": "https://git.kernel.org/stable/c/0a6a6d4fb333f7afe22e59ffed18511a7a98efc8" }, { "url": "https://git.kernel.org/stable/c/62f368472b0aa4b5d91d9b983152855c6b6d8925" }, { "url": "https://git.kernel.org/stable/c/51872b26429077be611b0a1816e0e722278015c3" }, { "url": "https://git.kernel.org/stable/c/3c80c230d6e3e6f63d43f4c3f0bb344e3e8b119b" }, { "url": "https://git.kernel.org/stable/c/33f9e6dc66b32202b95fc861e6b3ea4b0c185b0b" }, { "url": "https://git.kernel.org/stable/c/3ab9f5ad9baefe6d3d4c37053cdfca2761001dfe" }, { "url": "https://git.kernel.org/stable/c/ec79003c5f9d2c7f9576fc69b8dbda80305cbe3a" } ], "title": "atm: atmtcp: Prevent arbitrary write in atmtcp_recv_control().", "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" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:43:50.044Z" } }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-05-12T12:07:23.938Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC CN 4100", "versions": [ { "status": "affected", "version": "0", "lessThan": "V5.0", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html" } ] } ] } }