CVE-2026-63860

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userspace\ndoes include the terminating nul, even tough its not enforced so far, and\nthus NLA_NUL_STRING use is the simpler solution."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached when userspace sends crafted NETLINK_RDMA (protocol 20) messages to the iWARP Port Mapper netlink handlers in `iwpm_register_pid_cb()` and `iwpm_mapping_info_cb()`, not from remote network packets.\nAC:L - An attacker fully controls the netlink attribute payload and can send a maximal-length string without a NUL terminator to reliably trigger unbounded `strcmp()` reads; no race or victim-dependent state is required beyond reaching the handler.\nPR:N - IWPM netlink ops lack `RDMA_NL_ADMIN_PERM`, and `netlink_sendmsg()` only enforces `CAP_NET_ADMIN` when `dst_pid` or `dst_group` is non-zero, so an unprivileged local process can send messages to the kernel RDMA netlink socket without capabilities or user-namespace tricks.\nUI:N - Exploitation requires only a local process sending a crafted netlink message; no victim interaction such as mounting a filesystem or opening a device is needed.\nS:U - Impact is confined to kernel RDMA/iWARP port-mapper state (e.g., `iwpm_user_pid`, mapping tables) within the same kernel security authority and does not cross VM, container, or IOMMU boundaries.\nC:H - `NLA_STRING` does not enforce a NUL terminator, yet `strcmp()` reads until `\\0`, causing an out-of-bounds kernel read past the attribute boundary; error paths also pass the pointer to `%s` in `pr_info()`, enabling further kernel memory disclosure.\nI:H - By sending exactly 19 bytes of `iWarpPortMapperUser` without a terminator, an attacker can make `strcmp()` read a NUL from NLA padding and pass validation, hijacking `iwpm_user_pid` and redirecting subsequent iWARP port-mapping operations to attacker-controlled userspace.\nA:H - Unbounded `strcmp()` on a non-NUL-terminated netlink attribute can read beyond the skb buffer and trigger a kernel page fault/oops, and successful port-mapper impersonation can disrupt iWARP connectivity on affected systems."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/infiniband/core/iwpm_msg.c"], "versions": [{"version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "lessThan": "fcd07d3b8ee7a39b344d73aed69c1a68cd9eacdf", "status": "affected", "versionType": "git"}, {"version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "lessThan": "87111356d58d86edb221ba144d261ed83a5b8bbe", "status": "affected", "versionType": "git"}, {"version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "lessThan": "abda65bdd13084c771842adaac1f652d0660dd82", "status": "affected", "versionType": "git"}, {"version": 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NLA_NUL_STRING", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-63860", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:32:29.749777Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-170", "description": "CWE-170 Improper Null Termination"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:07:52.376Z"}}]}}

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netlink attribute payload and can send a maximal-length string without a NUL terminator to reliably trigger unbounded `strcmp()` reads; no race or victim-dependent state is required beyond reaching the handler.\nPR:N - IWPM netlink ops lack `RDMA_NL_ADMIN_PERM`, and `netlink_sendmsg()` only enforces `CAP_NET_ADMIN` when `dst_pid` or `dst_group` is non-zero, so an unprivileged local process can send messages to the kernel RDMA netlink socket without capabilities or user-namespace tricks.\nUI:N - Exploitation requires only a local process sending a crafted netlink message; no victim interaction such as mounting a filesystem or opening a device is needed.\nS:U - Impact is confined to kernel RDMA/iWARP port-mapper state (e.g., `iwpm_user_pid`, mapping tables) within the same kernel security authority and does not cross VM, container, or IOMMU boundaries.\nC:H - `NLA_STRING` does not enforce a NUL terminator, yet `strcmp()` reads until `\\0`, causing an out-of-bounds kernel read past the attribute boundary; error paths also pass the pointer to `%s` in `pr_info()`, enabling further kernel memory disclosure.\nI:H - By sending exactly 19 bytes of `iWarpPortMapperUser` without a terminator, an attacker can make `strcmp()` read a NUL from NLA padding and pass validation, hijacking `iwpm_user_pid` and redirecting subsequent iWARP port-mapping operations to attacker-controlled userspace.\nA:H - Unbounded `strcmp()` on a non-NUL-terminated netlink attribute can read beyond the skb buffer and trigger a kernel page fault/oops, and successful port-mapper impersonation can disrupt iWARP connectivity on affected systems."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "30dc5e63d6a5ad24894b5512d10b228d73645a44", "lessThan": "fcd07d3b8ee7a39b344d73aed69c1a68cd9eacdf", "versionType": "git"}, {"status": "affected", "version": 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"versionEndExcluding": "6.18.33", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A13475D2-59BF-4716-94B5-7C1D239A2CF4", "versionEndExcluding": "7.0.10", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: Prefer NLA_NUL_STRING\n\nThese attributes are evaluated as c-string (passed to strcmp), but\nNLA_STRING doesn't check for the presence of a \\0 terminator.\n\nEither this needs to switch to nla_strcmp() and needs to adjust printf fmt\nspecifier to not use plain %s, or this needs to use NLA_NUL_STRING.\n\nAs the code has been this way for long time, it seems to me that userspace\ndoes include the terminating nul, even tough its not enforced so far, and\nthus NLA_NUL_STRING use is the simpler solution."}], "id": "CVE-2026-63860", "lastModified": "2026-10-23T18:50:24.027", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-63860", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:32:29.749777Z", "version": "2.0.3"}}]}, "published": "2026-07-19T15:16:52.850", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/137b5918931d4d05aa8ea8d3adf67f7224eef63c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5877c043398d5fa0e93919a3d837e5cd7a98a961"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6ed3d14fc45d3da6025e7fe4a6a09066856698e2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/87111356d58d86edb221ba144d261ed83a5b8bbe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/abda65bdd13084c771842adaac1f652d0660dd82"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c26a0052cceed4c4d380ee5808b699f937fb58d8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f2c7b39dde2e61df8157066969cc2a408cd3dcd9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fcd07d3b8ee7a39b344d73aed69c1a68cd9eacdf"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-170"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: RDMA/core: Prefer NLA_NUL_STRING", "id": "2502309", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502309"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nRDMA/core: Prefer NLA_NUL_STRING\nThese attributes are evaluated as c-string (passed to strcmp), but\nNLA_STRING doesn't check for the presence of a \\0 terminator.\nEither this needs to switch to nla_strcmp() and needs to adjust printf fmt\nspecifier to not use plain %s, or this needs to use NLA_NUL_STRING.\nAs the code has been this way for long time, it seems to me that userspace\ndoes include the terminating nul, even tough its not enforced so far, and\nthus NLA_NUL_STRING use is the simpler solution.", "A flaw was found in the Linux kernel's RDMA/core component. This vulnerability arises from the improper handling of Netlink Attribute (NLA) strings, where attributes evaluated as C-strings do not properly check for a null terminator. A local attacker could potentially provide specially crafted input, leading to unexpected behavior or information disclosure due to out-of-bounds reads during string comparisons."], "name": "CVE-2026-63860", "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63860\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63860\nhttps://lore.kernel.org/linux-cve-announce/2026071933-CVE-2026-63860-6168@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[30dc5e63d6a5ad24894b5512d10b228d73645a44,fcd07d3b8ee7a39b344d73aed69c1a68cd9eacdf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[30dc5e63d6a5ad24894b5512d10b228d73645a44,87111356d58d86edb221ba144d261ed83a5b8bbe)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[30dc5e63d6a5ad24894b5512d10b228d73645a44,abda65bdd13084c771842adaac1f652d0660dd82)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[30dc5e63d6a5ad24894b5512d10b228d73645a44,137b5918931d4d05aa8ea8d3adf67f7224eef63c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[30dc5e63d6a5ad24894b5512d10b228d73645a44,5877c043398d5fa0e93919a3d837e5cd7a98a961)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[30dc5e63d6a5ad24894b5512d10b228d73645a44,f2c7b39dde2e61df8157066969cc2a408cd3dcd9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[30dc5e63d6a5ad24894b5512d10b228d73645a44,c26a0052cceed4c4d380ee5808b699f937fb58d8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[30dc5e63d6a5ad24894b5512d10b228d73645a44,6ed3d14fc45d3da6025e7fe4a6a09066856698e2)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.258,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.209,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.175,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.141,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.91,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.33,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.10,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-21T05:00:11.666445+00:00", "updated": "2026-10-20T14:15:14.431812+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}