{"api_version":"1","generated_at":"2026-08-09T15:32:49+00:00","cve":"CVE-2024-56718","urls":{"html":"https://cve.report/CVE-2024-56718","api":"https://cve.report/api/cve/CVE-2024-56718.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2024-56718","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2024-56718"},"summary":{"title":"net/smc: protect link down work from execute after lgr freed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: protect link down work from execute after lgr freed\n\nlink down work may be scheduled before lgr freed but execute\nafter lgr freed, which may result in crash. So it is need to\nhold a reference before shedule link down work, and put the\nreference after work executed or canceled.\n\nThe relevant crash call stack as follows:\n list_del corruption. prev->next should be ffffb638c9c0fe20,\n    but was 0000000000000000\n ------------[ cut here ]------------\n kernel BUG at lib/list_debug.c:51!\n invalid opcode: 0000 [#1] SMP NOPTI\n CPU: 6 PID: 978112 Comm: kworker/6:119 Kdump: loaded Tainted: G #1\n Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 2221b89 04/01/2014\n Workqueue: events smc_link_down_work [smc]\n RIP: 0010:__list_del_entry_valid.cold+0x31/0x47\n RSP: 0018:ffffb638c9c0fdd8 EFLAGS: 00010086\n RAX: 0000000000000054 RBX: ffff942fb75e5128 RCX: 0000000000000000\n RDX: ffff943520930aa0 RSI: ffff94352091fc80 RDI: ffff94352091fc80\n RBP: 0000000000000000 R08: 0000000000000000 R09: ffffb638c9c0fc38\n R10: ffffb638c9c0fc30 R11: ffffffffa015eb28 R12: 0000000000000002\n R13: ffffb638c9c0fe20 R14: 0000000000000001 R15: ffff942f9cd051c0\n FS:  0000000000000000(0000) GS:ffff943520900000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007f4f25214000 CR3: 000000025fbae004 CR4: 00000000007706e0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n PKRU: 55555554\n Call Trace:\n  rwsem_down_write_slowpath+0x17e/0x470\n  smc_link_down_work+0x3c/0x60 [smc]\n  process_one_work+0x1ac/0x350\n  worker_thread+0x49/0x2f0\n  ? rescuer_thread+0x360/0x360\n  kthread+0x118/0x140\n  ? __kthread_bind_mask+0x60/0x60\n  ret_from_fork+0x1f/0x30","state":"PUBLISHED","assigner":"Linux","published_at":"2024-12-29 09:15:07","updated_at":"2026-08-04 11:22:24"},"problem_types":["NVD-CWE-noinfo","CWE-noinfo Not enough 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So it is need to\nhold a reference before shedule link down work, and put the\nreference after work executed or canceled.\n\nThe relevant crash call stack as follows:\n list_del corruption. prev->next should be ffffb638c9c0fe20,\n    but was 0000000000000000\n ------------[ cut here ]------------\n kernel BUG at lib/list_debug.c:51!\n invalid opcode: 0000 [#1] SMP NOPTI\n CPU: 6 PID: 978112 Comm: kworker/6:119 Kdump: loaded Tainted: G #1\n Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 2221b89 04/01/2014\n Workqueue: events smc_link_down_work [smc]\n RIP: 0010:__list_del_entry_valid.cold+0x31/0x47\n RSP: 0018:ffffb638c9c0fdd8 EFLAGS: 00010086\n RAX: 0000000000000054 RBX: ffff942fb75e5128 RCX: 0000000000000000\n RDX: ffff943520930aa0 RSI: ffff94352091fc80 RDI: ffff94352091fc80\n RBP: 0000000000000000 R08: 0000000000000000 R09: ffffb638c9c0fc38\n R10: ffffb638c9c0fc30 R11: ffffffffa015eb28 R12: 0000000000000002\n R13: ffffb638c9c0fe20 R14: 0000000000000001 R15: ffff942f9cd051c0\n FS:  0000000000000000(0000) GS:ffff943520900000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007f4f25214000 CR3: 000000025fbae004 CR4: 00000000007706e0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n PKRU: 55555554\n Call Trace:\n  rwsem_down_write_slowpath+0x17e/0x470\n  smc_link_down_work+0x3c/0x60 [smc]\n  process_one_work+0x1ac/0x350\n  worker_thread+0x49/0x2f0\n  ? rescuer_thread+0x360/0x360\n  kthread+0x118/0x140\n  ? __kthread_bind_mask+0x60/0x60\n  ret_from_fork+0x1f/0x30"}],"metrics":[{"cvssV3_1":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-08-04T09:39:54.035Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/bec2f52866d511e94c1c37cd962e4382b1b1a299"},{"url":"https://git.kernel.org/stable/c/2627c3e8646932dfc7b9722c88c2e1ffcf7a9fb2"},{"url":"https://git.kernel.org/stable/c/841b1824750d3b8d1dc0a96b14db4418b952abbc"},{"url":"https://git.kernel.org/stable/c/2b33eb8f1b3e8c2f87cfdbc8cc117f6bdfabc6ec"}],"title":"net/smc: protect link down work from execute after lgr freed","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2024-56718","datePublished":"2024-12-29T08:48:50.740Z","dateReserved":"2024-12-27T15:00:39.858Z","dateUpdated":"2026-08-04T09:39:54.035Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2024-12-29 09:15:07","lastModifiedDate":"2026-08-04 11:22:24","problem_types":["NVD-CWE-noinfo","CWE-noinfo Not enough information"],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.9},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6},{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2025-10-01T19:58:28.250334Z","id":"CVE-2024-56718","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8","versionEndExcluding":"6.1.122","matchCriteriaId":"0B8A4CE0-486C-4CC3-91F6-B23D8541F6D0"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.68","matchCriteriaId":"74BA9823-CCED-4B24-815D-B82543954BF8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.7","matchCriteriaId":"811AC89A-14AC-49FA-9B54-E99526F1CA47"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*","matchCriteriaId":"62567B3C-6CEE-46D0-BC2E-B3717FBF7D13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*","matchCriteriaId":"5A073481-106D-4B15-B4C7-FB0213B8E1D4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*","matchCriteriaId":"DE491969-75AE-4A6B-9A58-8FC5AF98798F"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2024","CveId":"56718","Ordinal":"1","Title":"net/smc: protect link down work from execute after lgr freed","CVE":"CVE-2024-56718","Year":"2024"},"notes":[{"CveYear":"2024","CveId":"56718","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: protect link down work from execute after lgr freed\n\nlink down work may be scheduled before lgr freed but execute\nafter lgr freed, which may result in crash. So it is need to\nhold a reference before shedule link down work, and put the\nreference after work executed or canceled.\n\nThe relevant crash call stack as follows:\n list_del corruption. prev->next should be ffffb638c9c0fe20,\n    but was 0000000000000000\n ------------[ cut here ]------------\n kernel BUG at lib/list_debug.c:51!\n invalid opcode: 0000 [#1] SMP NOPTI\n CPU: 6 PID: 978112 Comm: kworker/6:119 Kdump: loaded Tainted: G #1\n Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 2221b89 04/01/2014\n Workqueue: events smc_link_down_work [smc]\n RIP: 0010:__list_del_entry_valid.cold+0x31/0x47\n RSP: 0018:ffffb638c9c0fdd8 EFLAGS: 00010086\n RAX: 0000000000000054 RBX: ffff942fb75e5128 RCX: 0000000000000000\n RDX: ffff943520930aa0 RSI: ffff94352091fc80 RDI: ffff94352091fc80\n RBP: 0000000000000000 R08: 0000000000000000 R09: ffffb638c9c0fc38\n R10: ffffb638c9c0fc30 R11: ffffffffa015eb28 R12: 0000000000000002\n R13: ffffb638c9c0fe20 R14: 0000000000000001 R15: ffff942f9cd051c0\n FS:  0000000000000000(0000) GS:ffff943520900000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007f4f25214000 CR3: 000000025fbae004 CR4: 00000000007706e0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n PKRU: 55555554\n Call Trace:\n  rwsem_down_write_slowpath+0x17e/0x470\n  smc_link_down_work+0x3c/0x60 [smc]\n  process_one_work+0x1ac/0x350\n  worker_thread+0x49/0x2f0\n  ? rescuer_thread+0x360/0x360\n  kthread+0x118/0x140\n  ? __kthread_bind_mask+0x60/0x60\n  ret_from_fork+0x1f/0x30","Type":"Description","Title":"net/smc: protect link down work from execute after lgr freed"}]}}}