{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64000", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.026Z", "datePublished": "2026-07-19T14:56:18.116Z", "dateUpdated": "2026-08-05T12:38:01.596Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:38:01.596Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: hsr: fix potential OOB access in supervision frame handling\n\nEnsure the entire TLV header is linearized before access by adding\nsizeof(struct hsr_sup_tlv) to the pskb_may_pull() calls. Without this,\na truncated frame could cause an out-of-bounds access." } ], "metrics": [ { "cvssV3_1": { "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" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable code is reached when the kernel processes received Ethernet frames via the netdev RX handler in net/hsr, and a remote attacker on the HSR/PRP ring can deliver a crafted supervision frame without any local access to the victim host.\nAC:L - The attacker fully controls the malformed frame content and length; a precisely truncated supervision frame reliably passes existing TLV validation and triggers the out-of-bounds read with no races or attacker-uncontrollable conditions.\nPR:N - Exploitation requires only the ability to inject L2 HSR/PRP supervision frames onto the ring segment; no local account, capabilities, or authentication on the target kernel is needed.\nUI:N - No victim user action is required beyond normal operation of an HSR/PRP-configured node; the attacker triggers the bug solely by sending a malicious frame.\nS:U - Impact is confined to kernel memory safety within the same security authority; there is no VM escape, IOMMU bypass, or cross-security-boundary scope change.\nC:H - The bug is an out-of-bounds read of supervision TLV header fields past the skb tail, which can disclose adjacent kernel heap/skb memory and is not strictly bounded to a few attacker-uncontrolled bytes.\nI:H - Out-of-bounds access in kernel packet parsing can supply attacker-influenced TLV type/length values that drive further skb_pull arithmetic and extended parsing, creating a plausible path to memory corruption and control-flow hijacking.\nA:H - Reading beyond the skb buffer boundary during softirq packet processing can cause a kernel oops/panic, and the attacker can repeatedly trigger the condition with crafted frames." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/hsr/hsr_forward.c" ], "versions": [ { "version": "eafaa88b3eb7f28aecb222281655473431d3ef2e", "lessThan": "09a37dca090c55ffb1a33f52d8667f1c2367ef48", "status": "affected", "versionType": "git" }, { "version": "eafaa88b3eb7f28aecb222281655473431d3ef2e", "lessThan": "a4b64f3e9c7b8259f7dd251a0313420ba7c01852", "status": "affected", "versionType": "git" }, { "version": "eafaa88b3eb7f28aecb222281655473431d3ef2e", "lessThan": "71c986c0ba45b7dc574fae27c83e7b6671556f37", "status": "affected", "versionType": "git" }, { "version": "eafaa88b3eb7f28aecb222281655473431d3ef2e", "lessThan": "fbd0662f9c9a66e8cc3df3099cca8ed6d3837cc7", "status": "affected", "versionType": "git" }, { "version": "eafaa88b3eb7f28aecb222281655473431d3ef2e", "lessThan": "78607a6854a22a2502f68092202e75a39af4865d", "status": "affected", "versionType": "git" }, { "version": "eafaa88b3eb7f28aecb222281655473431d3ef2e", "lessThan": "f229426072fc865654a60978bb7fda790a051ff3", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/hsr/hsr_forward.c" ], "versions": [ { "version": "5.16", "status": "affected" }, { "version": "0", "lessThan": "5.16", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.176", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.93", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.35", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.12", "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": "5.16", "versionEndExcluding": "6.1.176" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.6.143" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.12.93" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.18.35" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "7.0.12" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/09a37dca090c55ffb1a33f52d8667f1c2367ef48" }, { "url": "https://git.kernel.org/stable/c/a4b64f3e9c7b8259f7dd251a0313420ba7c01852" }, { "url": "https://git.kernel.org/stable/c/71c986c0ba45b7dc574fae27c83e7b6671556f37" }, { "url": "https://git.kernel.org/stable/c/fbd0662f9c9a66e8cc3df3099cca8ed6d3837cc7" }, { "url": "https://git.kernel.org/stable/c/78607a6854a22a2502f68092202e75a39af4865d" }, { "url": "https://git.kernel.org/stable/c/f229426072fc865654a60978bb7fda790a051ff3" } ], "title": "net: hsr: fix potential OOB access in supervision frame handling", "x_generator": { "engine": "bippy-1.2.0" } } } }