{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43406", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:56.007Z", "datePublished": "2026-05-08T14:21:46.246Z", "dateUpdated": "2026-08-05T12:27:49.364Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:27:49.364Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: prevent potential out-of-bounds reads in process_message_header()\n\nIf the message frame is (maliciously) corrupted in a way that the\nlength of the control segment ends up being less than the size of the\nmessage header or a different frame is made to look like a message\nframe, out-of-bounds reads may ensue in process_message_header().\n\nPerform an explicit bounds check before decoding the message header." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 9.1, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable libceph messenger v2 path is reached by TCP data received from a Ceph peer, and the reproducer triggers it over the network against a kernel Ceph client.\nAC:L - The bug is deterministic: a peer sends a FRAME_TAG_MESSAGE frame with a control segment shorter than struct ceph_msg_header2 in msgr2 crc/non-secure mode. No race or attacker-uncontrolled timing condition is required.\nPR:N - The vulnerable read can occur during CEPH_CON_S_V2_HELLO or CEPH_CON_S_V2_AUTH before credentials are verified, so the network peer does not need authenticated privileges.\nUI:N - In a reasonable deployment with an already configured or reconnecting Ceph client, a malicious or spoofed Ceph peer can send the frame without further victim action.\nS:U - The impact is within the kernel/libceph client security scope and does not cross a VM, IOMMU, or other separate security authority boundary.\nC:H - The flaw is a slab out-of-bounds read of attacker-triggered kernel memory beyond a too-small control buffer. Following the required guidance, an out-of-bounds read that is not strictly limited to only a few bytes is scored High for confidentiality.\nI:N - The defect is an out-of-bounds read, and the investigated path does not provide an out-of-bounds write, memory corruption, or authenticated message dispatch that would directly modify data.\nA:H - The malformed network frame deterministically triggers a KASAN-detected slab out-of-bounds access in the ceph-msgr workqueue and can fault/disrupt the Ceph client connection. Repeated unauthenticated triggering can deny availability of kernel Ceph storage access." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ceph/messenger_v2.c" ], "versions": [ { "version": "cd1a677cad994021b19665ed476aea63f5d54f31", "lessThan": "76ccf21a12c5f6d6790bc32c7da82446d877b2f4", "status": "affected", "versionType": "git" }, { "version": "cd1a677cad994021b19665ed476aea63f5d54f31", "lessThan": "75582aaa580c11aed4c7731cad6b068b700e7efb", "status": "affected", "versionType": "git" }, { "version": "cd1a677cad994021b19665ed476aea63f5d54f31", "lessThan": "50156622eb0888e62541d715a98584480a1bc7cb", "status": "affected", "versionType": "git" }, { "version": "cd1a677cad994021b19665ed476aea63f5d54f31", "lessThan": "dbd857a9e1e33ea71eaf3e211877027e533770d1", "status": "affected", "versionType": "git" }, { "version": "cd1a677cad994021b19665ed476aea63f5d54f31", "lessThan": "69fe5af33fa3806f398d21c081d73c66e5523bc2", "status": "affected", "versionType": "git" }, { "version": "cd1a677cad994021b19665ed476aea63f5d54f31", "lessThan": "035867ae6f18df0aeedb2a57a5b74091bd4e3fe8", "status": "affected", "versionType": "git" }, { "version": "cd1a677cad994021b19665ed476aea63f5d54f31", "lessThan": "69fb5d91bba44ecf7eb80530b85fa4fb028921d5", "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/ceph/messenger_v2.c" ], "versions": [ { "version": "5.11", "status": "affected" }, { "version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.19", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.9", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "5.11", "versionEndExcluding": "5.15.203" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.1.167" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.6.130" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.12.78" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.18.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.19.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/76ccf21a12c5f6d6790bc32c7da82446d877b2f4" }, { "url": "https://git.kernel.org/stable/c/75582aaa580c11aed4c7731cad6b068b700e7efb" }, { "url": "https://git.kernel.org/stable/c/50156622eb0888e62541d715a98584480a1bc7cb" }, { "url": "https://git.kernel.org/stable/c/dbd857a9e1e33ea71eaf3e211877027e533770d1" }, { "url": "https://git.kernel.org/stable/c/69fe5af33fa3806f398d21c081d73c66e5523bc2" }, { "url": "https://git.kernel.org/stable/c/035867ae6f18df0aeedb2a57a5b74091bd4e3fe8" }, { "url": "https://git.kernel.org/stable/c/69fb5d91bba44ecf7eb80530b85fa4fb028921d5" } ], "title": "libceph: prevent potential out-of-bounds reads in process_message_header()", "x_generator": { "engine": "bippy-1.2.0" } } } }