{"id":"CVE-2026-53078","state":"PUBLISHED","title":"bpf: Fix same-register dst/src OOB read and pointer leak in sock_ops","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix same-register dst/src OOB read and pointer leak in sock_ops\n\nWhen a BPF sock_ops program accesses ctx fields with dst_reg == src_reg,\nthe SOCK_OPS_GET_SK() and SOCK_OPS_GET_FIELD() macros fail to zero the\ndestination register in the !fullsock / !locked_tcp_sock path.\n\nBoth macros borrow a temporary register to check is_fullsock /\nis_locked_tcp_sock when dst_reg == src_reg, because dst_reg holds the\nctx pointer. When the check is false (e.g., TCP_NEW_SYN_RECV state with\na request_sock), dst_reg should be zeroed but is not, leaving the stale\nctx pointer:\n\n - SOCK_OPS_GET_SK: dst_reg retains the ctx pointer, passes NULL checks\n   as PTR_TO_SOCKET_OR_NULL, and can be used as a bogus socket pointer,\n   leading to stack-out-of-bounds access in helpers like\n   bpf_skc_to_tcp6_sock().\n\n - SOCK_OPS_GET_FIELD: dst_reg retains the ctx pointer which the\n   verifier believes is a SCALAR_VALUE, leaking a kernel pointer.\n\nFix both macros by:\n - Changing JMP_A(1) to JMP_A(2) in the fullsock path to skip the\n   added instruction.\n - Adding BPF_MOV64_IMM(si->dst_reg, 0) after the temp register\n   restore in the !fullsock path, placed after the restore because\n   dst_reg == src_reg means we need src_reg intact to read ctx->temp.","publishedAt":"2026-06-24T16:30:18.858Z","updatedAt":"2026-10-19T19:47:15.752Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"fd09af010788a884de1c39537c288830c3d305db","status":"affected","lessThan":"db1200ec2c3ddf119d4d9ba67982063df06bbacb","versionType":"git"},{"version":"fd09af010788a884de1c39537c288830c3d305db","status":"affected","lessThan":"4c1c5efd9d1d74743d41ce4e1600501b4feb6827","versionType":"git"},{"version":"fd09af010788a884de1c39537c288830c3d305db","status":"affected","lessThan":"0e6b30657bbc771f38025c828d722b6162428508","versionType":"git"},{"version":"fd09af010788a884de1c39537c288830c3d305db","status":"affected","lessThan":"64eaf4ecda007140ddcdb28e00c48c9c69aaba39","versionType":"git"},{"version":"fd09af010788a884de1c39537c288830c3d305db","status":"affected","lessThan":"2a2c98141e0a75f2d4a7d78b0316c88b3da784ac","versionType":"git"},{"version":"fd09af010788a884de1c39537c288830c3d305db","status":"affected","lessThan":"22400725de070b787cd6d806c5795370ab46d269","versionType":"git"},{"version":"fd09af010788a884de1c39537c288830c3d305db","status":"affected","lessThan":"18e3ffde1822f0b48b1753bf34aa97ce839df1d8","versionType":"git"},{"version":"fd09af010788a884de1c39537c288830c3d305db","status":"affected","lessThan":"10f86a2a5c91fc4c4d001960f1c21abe52545ef6","versionType":"git"},{"version":"48be3df15aa19c04eadf156c9129293c9a10389f","status":"affected","versionType":"git"},{"version":"cd4644d904e1d153d516e73e2e127e7a2fe687e1","status":"affected","versionType":"git"},{"version":"6e0bc946cbeec538322820786b5fb5200a2216ab","status":"affected","versionType":"git"},{"version":"a7e52f7f675046d9ffc5692d815fa67c82fcdbf5","status":"affected","versionType":"git"},{"version":"db7f8c57dbdd31f7e59f8dc8d1e1b38607a320ef","status":"affected","versionType":"git"},{"version":"5.7.18","status":"affected","lessThan":"5.8","versionType":"semver"},{"version":"5.8.4","status":"affected","lessThan":"5.9","versionType":"semver"},{"version":"5.4.61","status":"affected","lessThan":"5.5","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/filter.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.9","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/filter.c"]}],"references":["https://git.kernel.org/stable/c/db1200ec2c3ddf119d4d9ba67982063df06bbacb","https://git.kernel.org/stable/c/4c1c5efd9d1d74743d41ce4e1600501b4feb6827","https://git.kernel.org/stable/c/0e6b30657bbc771f38025c828d722b6162428508","https://git.kernel.org/stable/c/64eaf4ecda007140ddcdb28e00c48c9c69aaba39","https://git.kernel.org/stable/c/2a2c98141e0a75f2d4a7d78b0316c88b3da784ac","https://git.kernel.org/stable/c/22400725de070b787cd6d806c5795370ab46d269","https://git.kernel.org/stable/c/18e3ffde1822f0b48b1753bf34aa97ce839df1d8","https://git.kernel.org/stable/c/10f86a2a5c91fc4c4d001960f1c21abe52545ef6"],"weaknesses":["CWE-125"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53078.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53078","state":"PUBLISHED","datePublished":"2026-06-24T16:30:18.858Z","dateUpdated":"2026-10-19T19:47:15.752Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.383Z"},"containers":{"cna":{"title":"bpf: Fix same-register dst/src OOB read and pointer leak in sock_ops","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix same-register dst/src OOB read and pointer leak in sock_ops\n\nWhen a BPF sock_ops program accesses ctx fields with dst_reg == src_reg,\nthe SOCK_OPS_GET_SK() and SOCK_OPS_GET_FIELD() macros fail to zero the\ndestination register in the !fullsock / !locked_tcp_sock path.\n\nBoth macros borrow a temporary register to check is_fullsock /\nis_locked_tcp_sock when dst_reg == src_reg, because dst_reg holds the\nctx pointer. When the check is false (e.g., TCP_NEW_SYN_RECV state with\na request_sock), dst_reg should be zeroed but is not, leaving the stale\nctx pointer:\n\n - SOCK_OPS_GET_SK: dst_reg retains the ctx pointer, passes NULL checks\n   as PTR_TO_SOCKET_OR_NULL, and can be used as a bogus socket pointer,\n   leading to stack-out-of-bounds access in helpers like\n   bpf_skc_to_tcp6_sock().\n\n - SOCK_OPS_GET_FIELD: dst_reg retains the ctx pointer which the\n   verifier believes is a SCALAR_VALUE, leaking a kernel pointer.\n\nFix both macros by:\n - Changing JMP_A(1) to JMP_A(2) in the fullsock path to skip the\n   added instruction.\n - Adding BPF_MOV64_IMM(si->dst_reg, 0) after the temp register\n   restore in the !fullsock path, placed after the restore because\n   dst_reg == src_reg means we need src_reg intact to read ctx->temp."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"fd09af010788a884de1c39537c288830c3d305db","status":"affected","lessThan":"db1200ec2c3ddf119d4d9ba67982063df06bbacb","versionType":"git"},{"version":"fd09af010788a884de1c39537c288830c3d305db","status":"affected","lessThan":"4c1c5efd9d1d74743d41ce4e1600501b4feb6827","versionType":"git"},{"version":"fd09af010788a884de1c39537c288830c3d305db","status":"affected","lessThan":"0e6b30657bbc771f38025c828d722b6162428508","versionType":"git"},{"version":"fd09af010788a884de1c39537c288830c3d305db","status":"affected","lessThan":"64eaf4ecda007140ddcdb28e00c48c9c69aaba39","versionType":"git"},{"version":"fd09af010788a884de1c39537c288830c3d305db","status":"affected","lessThan":"2a2c98141e0a75f2d4a7d78b0316c88b3da784ac","versionType":"git"},{"version":"fd09af010788a884de1c39537c288830c3d305db","status":"affected","lessThan":"22400725de070b787cd6d806c5795370ab46d269","versionType":"git"},{"version":"fd09af010788a884de1c39537c288830c3d305db","status":"affected","lessThan":"18e3ffde1822f0b48b1753bf34aa97ce839df1d8","versionType":"git"},{"version":"fd09af010788a884de1c39537c288830c3d305db","status":"affected","lessThan":"10f86a2a5c91fc4c4d001960f1c21abe52545ef6","versionType":"git"},{"version":"48be3df15aa19c04eadf156c9129293c9a10389f","status":"affected","versionType":"git"},{"version":"cd4644d904e1d153d516e73e2e127e7a2fe687e1","status":"affected","versionType":"git"},{"version":"6e0bc946cbeec538322820786b5fb5200a2216ab","status":"affected","versionType":"git"},{"version":"a7e52f7f675046d9ffc5692d815fa67c82fcdbf5","status":"affected","versionType":"git"},{"version":"db7f8c57dbdd31f7e59f8dc8d1e1b38607a320ef","status":"affected","versionType":"git"},{"version":"5.7.18","status":"affected","lessThan":"5.8","versionType":"semver"},{"version":"5.8.4","status":"affected","lessThan":"5.9","versionType":"semver"},{"version":"5.4.61","status":"affected","lessThan":"5.5","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/filter.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.9","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/filter.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/db1200ec2c3ddf119d4d9ba67982063df06bbacb"},{"url":"https://git.kernel.org/stable/c/4c1c5efd9d1d74743d41ce4e1600501b4feb6827"},{"url":"https://git.kernel.org/stable/c/0e6b30657bbc771f38025c828d722b6162428508"},{"url":"https://git.kernel.org/stable/c/64eaf4ecda007140ddcdb28e00c48c9c69aaba39"},{"url":"https://git.kernel.org/stable/c/2a2c98141e0a75f2d4a7d78b0316c88b3da784ac"},{"url":"https://git.kernel.org/stable/c/22400725de070b787cd6d806c5795370ab46d269"},{"url":"https://git.kernel.org/stable/c/18e3ffde1822f0b48b1753bf34aa97ce839df1d8"},{"url":"https://git.kernel.org/stable/c/10f86a2a5c91fc4c4d001960f1c21abe52545ef6"}],"metrics":[{"cvssV3_1":{"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"},"scenarios":[{"lang":"en","value":"AV:L - Exploitation requires loading and attaching a crafted BPF_PROG_TYPE_SOCK_OPS program through the local bpf() interface. Remote TCP traffic can trigger an attached program, but cannot by itself create the malicious program.\nAC:L - The attacker controls the BPF bytecode pattern and can reliably trigger non-fullsock/request_sock sock_ops callbacks with local TCP activity. No uncontrolled race or rare runtime condition is required.\nPR:L - Loading/attaching sock_ops BPF requires BPF and net-admin style privileges, but these can be available to a local user through user-namespace/BPF-token delegation in plausible deployments. Under the required overestimate rule this is Low rather than High.\nUI:N - No victim action is needed after the attacker loads and attaches the crafted sock_ops program. The attacker can trigger the callback path directly.\nS:U - The impact is within the same kernel security authority. This is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The bug leaks a kernel context pointer as a scalar and lets it be used as a bogus socket pointer. Helper dereferences can perform kernel stack out-of-bounds reads, so confidentiality impact is High.\nI:H - The bogus verifier-approved socket pointer can reach helpers that mutate socket-associated state, creating plausible kernel memory corruption from a misinterpreted stack object. With uncertainty required to resolve upward, integrity impact is High.\nA:H - The same bogus pointer path can cause kernel stack out-of-bounds accesses and invalid helper dereferences. These can crash or panic the kernel, so availability impact is High."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-09-14T11:58:30.086Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"7.0.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"7.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7.18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.61"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7.18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.8.4"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-53078","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:25:20.096926Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-125","lang":"en","type":"CWE","description":"CWE-125 Out-of-bounds Read"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T19:47:15.752Z"}}]}}}