{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53078", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.383Z", "datePublished": "2026-06-24T16:30:18.858Z", "dateUpdated": "2026-08-05T12:33:11.207Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:33:11.207Z" }, "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." } ], "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/core/filter.c" ], "versions": [ { "version": "fd09af010788a884de1c39537c288830c3d305db", "lessThan": "2a2c98141e0a75f2d4a7d78b0316c88b3da784ac", "status": "affected", "versionType": "git" }, { "version": "fd09af010788a884de1c39537c288830c3d305db", "lessThan": "22400725de070b787cd6d806c5795370ab46d269", "status": "affected", "versionType": "git" }, { "version": "fd09af010788a884de1c39537c288830c3d305db", "lessThan": "18e3ffde1822f0b48b1753bf34aa97ce839df1d8", "status": "affected", "versionType": "git" }, { "version": "fd09af010788a884de1c39537c288830c3d305db", "lessThan": "10f86a2a5c91fc4c4d001960f1c21abe52545ef6", "status": "affected", "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", "lessThan": "5.8", "status": "affected", "versionType": "semver" }, { "version": "5.8.4", "lessThan": "5.9", "status": "affected", "versionType": "semver" }, { "version": "5.4.61", "lessThan": "5.5", "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/core/filter.c" ], "versions": [ { "version": "5.9", "status": "affected" }, { "version": "0", "lessThan": "5.9", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "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" } ] } ] } ], "references": [ { "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" } ], "title": "bpf: Fix same-register dst/src OOB read and pointer leak in sock_ops", "x_generator": { "engine": "bippy-1.2.0" } } } }