{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53076", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.383Z", "datePublished": "2026-06-24T16:30:17.092Z", "dateUpdated": "2026-08-05T12:33:09.042Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:33:09.042Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix OOB in pcpu_init_value\n\nAn out-of-bounds read occurs when copying element from a\nBPF_MAP_TYPE_CGROUP_STORAGE map to another pcpu map with the\nsame value_size that is not rounded up to 8 bytes.\n\nThe issue happens when:\n1. A CGROUP_STORAGE map is created with value_size not aligned to\n 8 bytes (e.g., 4 bytes)\n2. A pcpu map is created with the same value_size (e.g., 4 bytes)\n3. Update element in 2 with data in 1\n\npcpu_init_value assumes that all sources are rounded up to 8 bytes,\nand invokes copy_map_value_long to make a data copy, However, the\nassumption doesn't stand since there are some cases where the source\nmay not be rounded up to 8 bytes, e.g., CGROUP_STORAGE, skb->data.\nthe verifier verifies exactly the size that the source claims, not\nthe size rounded up to 8 bytes by kernel, an OOB happens when the\nsource has only 4 bytes while the copy size(4) is rounded up to 8." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable path is reached through local `bpf(2)` activity: creating BPF maps, loading a BPF program, and invoking `bpf_map_update_elem()` from that program. It is not directly reachable by remote packets without a local attacker-controlled BPF program already installed.\nAC:L - The trigger is deterministic: use a non-8-byte-aligned value size and pass a verifier-valid source buffer into a per-CPU hash update that previously copied the rounded-up size. No race or attacker-external timing condition is required.\nPR:L - A basic local user can reach the most severe reasonable case on systems where unprivileged BPF is enabled, including via socket-filter BPF and packet data sources; otherwise it requires BPF-related capabilities. Under the required higher-severity rule, this is PR:L rather than PR:H.\nUI:N - After the local attacker loads the BPF program and creates the maps, exploitation requires no victim action. The attacker triggers the helper path directly.\nS:U - The affected component and impacted resources are within the same kernel security authority. This is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The bug is an out-of-bounds kernel read whose extra bytes are copied into per-CPU map padding that can be returned through per-CPU map lookup paths. Even though each read is small, repeated attacker-controlled executions can disclose kernel memory, so the higher severity confidentiality value is warranted.\nI:N - The faulty copy writes only into the destination per-CPU map slot's allocated rounded padding, not past the allocated destination or into security-relevant map value bytes. I found no path turning this into attacker-controlled kernel data modification or control-flow corruption.\nA:H - The reported reproducer is a KASAN slab-out-of-bounds read in a deterministic BPF helper path, and such reachable kernel OOB reads can oops or panic on hardened/sanitized or unlucky layouts. Following the kernel scoring guidance and higher-severity rule, availability is H." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/hashtab.c" ], "versions": [ { "version": "d3bec0138bfbe58606fc1d6f57a4cdc1a20218db", "lessThan": "e19c5ed9f1922a6854073f8651a63fa7be26e9e9", "status": "affected", "versionType": "git" }, { "version": "d3bec0138bfbe58606fc1d6f57a4cdc1a20218db", "lessThan": "e0378419b0e20178b5d100b27c9cc7e51064202e", "status": "affected", "versionType": "git" }, { "version": "d3bec0138bfbe58606fc1d6f57a4cdc1a20218db", "lessThan": "6086079e6d1c32ba4c4b422612b8aebb1129a96c", "status": "affected", "versionType": "git" }, { "version": "d3bec0138bfbe58606fc1d6f57a4cdc1a20218db", "lessThan": "634a793d0e1c822412095d25a1338f8831ad894c", "status": "affected", "versionType": "git" }, { "version": "d3bec0138bfbe58606fc1d6f57a4cdc1a20218db", "lessThan": "576afddfee8d1108ee299bf10f581593540d1a36", "status": "affected", "versionType": "git" }, { "version": "c602ad2b52dcbca5af08e5137bd5575c039b52e3", "status": "affected", "versionType": "git" }, { "version": "ab68b940dd6f7b5f8e2557937162dcb8a0583a05", "status": "affected", "versionType": "git" }, { "version": "5.4.78", "lessThan": "5.5", "status": "affected", "versionType": "semver" }, { "version": "5.9.9", "lessThan": "5.10", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/hashtab.c" ], "versions": [ { "version": "5.10", "status": "affected" }, { "version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.33", "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": "5.10", "versionEndExcluding": "6.6.141" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.12.91" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.18.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "7.0.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "7.1" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.78" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e19c5ed9f1922a6854073f8651a63fa7be26e9e9" }, { "url": "https://git.kernel.org/stable/c/e0378419b0e20178b5d100b27c9cc7e51064202e" }, { "url": "https://git.kernel.org/stable/c/6086079e6d1c32ba4c4b422612b8aebb1129a96c" }, { "url": "https://git.kernel.org/stable/c/634a793d0e1c822412095d25a1338f8831ad894c" }, { "url": "https://git.kernel.org/stable/c/576afddfee8d1108ee299bf10f581593540d1a36" } ], "title": "bpf: Fix OOB in pcpu_init_value", "x_generator": { "engine": "bippy-1.2.0" } } } }