{"api_version":"1","generated_at":"2026-07-31T21:57:18+00:00","cve":"CVE-2025-40012","urls":{"html":"https://cve.report/CVE-2025-40012","api":"https://cve.report/api/cve/CVE-2025-40012.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2025-40012","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-40012"},"summary":{"title":"net/smc: fix warning in smc_rx_splice() when calling get_page()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix warning in smc_rx_splice() when calling get_page()\n\nsmc_lo_register_dmb() allocates DMB buffers with kzalloc(), which are\nlater passed to get_page() in smc_rx_splice(). Since kmalloc memory is\nnot page-backed, this triggers WARN_ON_ONCE() in get_page() and prevents\nholding a refcount on the buffer. This can lead to use-after-free if\nthe memory is released before splice_to_pipe() completes.\n\nUse folio_alloc() instead, ensuring DMBs are page-backed and safe for\nget_page().\n\nWARNING: CPU: 18 PID: 12152 at ./include/linux/mm.h:1330 smc_rx_splice+0xaf8/0xe20 [smc]\nCPU: 18 UID: 0 PID: 12152 Comm: smcapp Kdump: loaded Not tainted 6.17.0-rc3-11705-g9cf4672ecfee #10 NONE\nHardware name: IBM 3931 A01 704 (z/VM 7.4.0)\nKrnl PSW : 0704e00180000000 000793161032696c (smc_rx_splice+0xafc/0xe20 [smc])\n           R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3\nKrnl GPRS: 0000000000000000 001cee80007d3001 00077400000000f8 0000000000000005\n           0000000000000001 001cee80007d3006 0007740000001000 001c000000000000\n           000000009b0c99e0 0000000000001000 001c0000000000f8 001c000000000000\n           000003ffcc6f7c88 0007740003e98000 0007931600000005 000792969b2ff7b8\nKrnl Code: 0007931610326960: af000000\t\tmc\t0,0\n           0007931610326964: a7f4ff43\t\tbrc\t15,00079316103267ea\n          #0007931610326968: af000000\t\tmc\t0,0\n          >000793161032696c: a7f4ff3f\t\tbrc\t15,00079316103267ea\n           0007931610326970: e320f1000004\tlg\t%r2,256(%r15)\n           0007931610326976: c0e53fd1b5f5\tbrasl\t%r14,000793168fd5d560\n           000793161032697c: a7f4fbb5\t\tbrc\t15,00079316103260e6\n           0007931610326980: b904002b\t\tlgr\t%r2,%r11\nCall Trace:\n smc_rx_splice+0xafc/0xe20 [smc]\n smc_rx_splice+0x756/0xe20 [smc])\n smc_rx_recvmsg+0xa74/0xe00 [smc]\n smc_splice_read+0x1ce/0x3b0 [smc]\n sock_splice_read+0xa2/0xf0\n do_splice_read+0x198/0x240\n splice_file_to_pipe+0x7e/0x110\n do_splice+0x59e/0xde0\n __do_splice+0x11a/0x2d0\n __s390x_sys_splice+0x140/0x1f0\n __do_syscall+0x122/0x280\n system_call+0x6e/0x90\nLast Breaking-Event-Address:\nsmc_rx_splice+0x960/0xe20 [smc]\n---[ end trace 0000000000000000 ]---","state":"PUBLISHED","assigner":"Linux","published_at":"2025-10-20 16:15:37","updated_at":"2026-07-30 06:24:06"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/a35c04de2565db191726b5741e6b66a35002c652","name":"https://git.kernel.org/stable/c/a35c04de2565db191726b5741e6b66a35002c652","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/14fc4fdae42e34d7ee871b292ac2ecc61c2c5de7","name":"https://git.kernel.org/stable/c/14fc4fdae42e34d7ee871b292ac2ecc61c2c5de7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d5411685dc2f6ac7bdf01a0a204d56cae38c6cf6","name":"https://git.kernel.org/stable/c/d5411685dc2f6ac7bdf01a0a204d56cae38c6cf6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-40012","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-40012","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f7a22071dbf316c982fb44308874bd7ad9ac2091 14fc4fdae42e34d7ee871b292ac2ecc61c2c5de7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f7a22071dbf316c982fb44308874bd7ad9ac2091 d5411685dc2f6ac7bdf01a0a204d56cae38c6cf6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected f7a22071dbf316c982fb44308874bd7ad9ac2091 a35c04de2565db191726b5741e6b66a35002c652 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.10","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.10 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.50 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.16.10 6.16.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.17 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2025","cve_id":"40012","cve":"CVE-2025-40012","epss":"0.001790000","percentile":"0.076720000","score_date":"2026-07-30","updated_at":"2026-07-31 00:09:59"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/smc/smc_loopback.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"14fc4fdae42e34d7ee871b292ac2ecc61c2c5de7","status":"affected","version":"f7a22071dbf316c982fb44308874bd7ad9ac2091","versionType":"git"},{"lessThan":"d5411685dc2f6ac7bdf01a0a204d56cae38c6cf6","status":"affected","version":"f7a22071dbf316c982fb44308874bd7ad9ac2091","versionType":"git"},{"lessThan":"a35c04de2565db191726b5741e6b66a35002c652","status":"affected","version":"f7a22071dbf316c982fb44308874bd7ad9ac2091","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/smc/smc_loopback.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.10"},{"lessThan":"6.10","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.50","versionType":"semver"},{"lessThanOrEqual":"6.16.*","status":"unaffected","version":"6.16.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"6.17","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.50","versionStartIncluding":"6.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.16.10","versionStartIncluding":"6.10","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.17","versionStartIncluding":"6.10","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix warning in smc_rx_splice() when calling get_page()\n\nsmc_lo_register_dmb() allocates DMB buffers with kzalloc(), which are\nlater passed to get_page() in smc_rx_splice(). Since kmalloc memory is\nnot page-backed, this triggers WARN_ON_ONCE() in get_page() and prevents\nholding a refcount on the buffer. This can lead to use-after-free if\nthe memory is released before splice_to_pipe() completes.\n\nUse folio_alloc() instead, ensuring DMBs are page-backed and safe for\nget_page().\n\nWARNING: CPU: 18 PID: 12152 at ./include/linux/mm.h:1330 smc_rx_splice+0xaf8/0xe20 [smc]\nCPU: 18 UID: 0 PID: 12152 Comm: smcapp Kdump: loaded Not tainted 6.17.0-rc3-11705-g9cf4672ecfee #10 NONE\nHardware name: IBM 3931 A01 704 (z/VM 7.4.0)\nKrnl PSW : 0704e00180000000 000793161032696c (smc_rx_splice+0xafc/0xe20 [smc])\n           R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3\nKrnl GPRS: 0000000000000000 001cee80007d3001 00077400000000f8 0000000000000005\n           0000000000000001 001cee80007d3006 0007740000001000 001c000000000000\n           000000009b0c99e0 0000000000001000 001c0000000000f8 001c000000000000\n           000003ffcc6f7c88 0007740003e98000 0007931600000005 000792969b2ff7b8\nKrnl Code: 0007931610326960: af000000\t\tmc\t0,0\n           0007931610326964: a7f4ff43\t\tbrc\t15,00079316103267ea\n          #0007931610326968: af000000\t\tmc\t0,0\n          >000793161032696c: a7f4ff3f\t\tbrc\t15,00079316103267ea\n           0007931610326970: e320f1000004\tlg\t%r2,256(%r15)\n           0007931610326976: c0e53fd1b5f5\tbrasl\t%r14,000793168fd5d560\n           000793161032697c: a7f4fbb5\t\tbrc\t15,00079316103260e6\n           0007931610326980: b904002b\t\tlgr\t%r2,%r11\nCall Trace:\n smc_rx_splice+0xafc/0xe20 [smc]\n smc_rx_splice+0x756/0xe20 [smc])\n smc_rx_recvmsg+0xa74/0xe00 [smc]\n smc_splice_read+0x1ce/0x3b0 [smc]\n sock_splice_read+0xa2/0xf0\n do_splice_read+0x198/0x240\n splice_file_to_pipe+0x7e/0x110\n do_splice+0x59e/0xde0\n __do_splice+0x11a/0x2d0\n __s390x_sys_splice+0x140/0x1f0\n __do_syscall+0x122/0x280\n system_call+0x6e/0x90\nLast Breaking-Event-Address:\nsmc_rx_splice+0x960/0xe20 [smc]\n---[ end trace 0000000000000000 ]---"}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-30T05:59:27.599Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/14fc4fdae42e34d7ee871b292ac2ecc61c2c5de7"},{"url":"https://git.kernel.org/stable/c/d5411685dc2f6ac7bdf01a0a204d56cae38c6cf6"},{"url":"https://git.kernel.org/stable/c/a35c04de2565db191726b5741e6b66a35002c652"}],"title":"net/smc: fix warning in smc_rx_splice() when calling get_page()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2025-40012","datePublished":"2025-10-20T15:26:57.214Z","dateReserved":"2025-04-16T07:20:57.151Z","dateUpdated":"2026-07-30T05:59:27.599Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-10-20 16:15:37","lastModifiedDate":"2026-07-30 06:24:06","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2025","CveId":"40012","Ordinal":"1","Title":"net/smc: fix warning in smc_rx_splice() when calling get_page()","CVE":"CVE-2025-40012","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"40012","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix warning in smc_rx_splice() when calling get_page()\n\nsmc_lo_register_dmb() allocates DMB buffers with kzalloc(), which are\nlater passed to get_page() in smc_rx_splice(). Since kmalloc memory is\nnot page-backed, this triggers WARN_ON_ONCE() in get_page() and prevents\nholding a refcount on the buffer. This can lead to use-after-free if\nthe memory is released before splice_to_pipe() completes.\n\nUse folio_alloc() instead, ensuring DMBs are page-backed and safe for\nget_page().\n\nWARNING: CPU: 18 PID: 12152 at ./include/linux/mm.h:1330 smc_rx_splice+0xaf8/0xe20 [smc]\nCPU: 18 UID: 0 PID: 12152 Comm: smcapp Kdump: loaded Not tainted 6.17.0-rc3-11705-g9cf4672ecfee #10 NONE\nHardware name: IBM 3931 A01 704 (z/VM 7.4.0)\nKrnl PSW : 0704e00180000000 000793161032696c (smc_rx_splice+0xafc/0xe20 [smc])\n           R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3\nKrnl GPRS: 0000000000000000 001cee80007d3001 00077400000000f8 0000000000000005\n           0000000000000001 001cee80007d3006 0007740000001000 001c000000000000\n           000000009b0c99e0 0000000000001000 001c0000000000f8 001c000000000000\n           000003ffcc6f7c88 0007740003e98000 0007931600000005 000792969b2ff7b8\nKrnl Code: 0007931610326960: af000000\t\tmc\t0,0\n           0007931610326964: a7f4ff43\t\tbrc\t15,00079316103267ea\n          #0007931610326968: af000000\t\tmc\t0,0\n          >000793161032696c: a7f4ff3f\t\tbrc\t15,00079316103267ea\n           0007931610326970: e320f1000004\tlg\t%r2,256(%r15)\n           0007931610326976: c0e53fd1b5f5\tbrasl\t%r14,000793168fd5d560\n           000793161032697c: a7f4fbb5\t\tbrc\t15,00079316103260e6\n           0007931610326980: b904002b\t\tlgr\t%r2,%r11\nCall Trace:\n smc_rx_splice+0xafc/0xe20 [smc]\n smc_rx_splice+0x756/0xe20 [smc])\n smc_rx_recvmsg+0xa74/0xe00 [smc]\n smc_splice_read+0x1ce/0x3b0 [smc]\n sock_splice_read+0xa2/0xf0\n do_splice_read+0x198/0x240\n splice_file_to_pipe+0x7e/0x110\n do_splice+0x59e/0xde0\n __do_splice+0x11a/0x2d0\n __s390x_sys_splice+0x140/0x1f0\n __do_syscall+0x122/0x280\n system_call+0x6e/0x90\nLast Breaking-Event-Address:\nsmc_rx_splice+0x960/0xe20 [smc]\n---[ end trace 0000000000000000 ]---","Type":"Description","Title":"net/smc: fix warning in smc_rx_splice() when calling get_page()"}]}}}