CVE-2026-64124

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64124", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.036Z", "datePublished": "2026-07-19T15:40:21.879Z", "dateUpdated": "2026-08-05T12:39:30.822Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:39:30.822Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: devmem: reject dma-buf bind with non-page-aligned size or SG length\n\nnet_devmem_bind_dmabuf() trusts dmabuf->size and sg_dma_len() to be\nPAGE_SIZE multiples without checking:\n\n - tx_vec is sized dmabuf->size / PAGE_SIZE, and\n net_devmem_get_niov_at() only bounds-checks virt_addr < dmabuf->size\n before indexing tx_vec[virt_addr / PAGE_SIZE]. With size =\n N*PAGE_SIZE + r (1 <= r < PAGE_SIZE), sendmsg() at iov_base =\n N*PAGE_SIZE passes the bound check and reads tx_vec[N] -- one past.\n\n - owner->area.num_niovs = len / PAGE_SIZE while gen_pool_add_owner()\n covers the full byte len, so a non-page-multiple non-final sg\n desyncs num_niovs from the gen_pool region for every later sg, on\n both RX and TX.\n\ndma-buf does not require page-aligned sizes, so the bind path has to\nenforce what its own indexing assumes. Reject both with -EINVAL.\n\nThe size check is TX-only (only tx_vec is sized off dmabuf->size); the\nSG-length check covers both directions."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires local syscalls\u2014NETLINK_GENERIC netdev bind operations and sendmsg/recvmsg on TCP sockets\u2014not remote packet delivery. Network traffic can trigger RX allocations only after a local bind with a malformed dmabuf.\nAC:L - The attacker fully controls dmabuf size/SG layout at bind time and the virtual offset passed via sendmsg iovec bases, allowing reliable out-of-bounds indexing without races or victim-dependent timing.\nPR:L - TX bind intentionally lacks admin-perm; RX bind requires CAP_NET_ADMIN, which is obtainable in user namespaces via unshare. No real-root privileges are needed, only a local authorized user on a devmem-capable system.\nUI:N - No victim interaction is required; the attacker triggers the bug through their own netlink bind and socket operations.\nS:C - Corrupted net_iov metadata can program incorrect DMA addresses for NIC DMA operations, potentially impacting device memory outside the kernel's security authority\u2014a DMA boundary crossing inherent to the devmem subsystem.\nC:H - Out-of-bounds read of tx_vec leaks adjacent kernel heap contents (kernel pointers), and heap corruption from misindexed niovs arrays can be leveraged for arbitrary memory disclosure.\nI:H - Out-of-bounds writes to the niovs array corrupt adjacent kernel heap objects, and use of attacker-influenced pointers in skb fragment setup enables memory corruption exploitable for control-flow hijacking.\nA:H - Dereferencing corrupted net_iov pointers or corrupting heap metadata via out-of-bounds access can cause kernel oops, panic, or hang during TX sendmsg or RX packet processing."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/devmem.c"], "versions": [{"version": "bd61848900bff597764238f3a8ec67c815cd316e", "lessThan": "134c517dfa63203287b2aad6558017f42435a02e", "status": "affected", "versionType": "git"}, {"version": "bd61848900bff597764238f3a8ec67c815cd316e", "lessThan": "d5008e4e4ee6b739256b796702a7d1aae1b5c3b4", "status": "affected", "versionType": "git"}, {"version": "bd61848900bff597764238f3a8ec67c815cd316e", "lessThan": "4eb82ba543421e9e38cc14e4e82058b78850df50", "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/core/devmem.c"], "versions": [{"version": "6.16", "status": "affected"}, {"version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.35", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.11", "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": "6.16", "versionEndExcluding": "6.18.35"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/134c517dfa63203287b2aad6558017f42435a02e"}, {"url": "https://git.kernel.org/stable/c/d5008e4e4ee6b739256b796702a7d1aae1b5c3b4"}, {"url": "https://git.kernel.org/stable/c/4eb82ba543421e9e38cc14e4e82058b78850df50"}], "title": "net: devmem: reject dma-buf bind with non-page-aligned size or SG length", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/core/devmem.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "134c517dfa63203287b2aad6558017f42435a02e", "status": "affected", "version": "bd61848900bff597764238f3a8ec67c815cd316e", "versionType": "git"}, {"lessThan": "d5008e4e4ee6b739256b796702a7d1aae1b5c3b4", "status": "affected", "version": "bd61848900bff597764238f3a8ec67c815cd316e", "versionType": "git"}, {"lessThan": "4eb82ba543421e9e38cc14e4e82058b78850df50", "status": "affected", "version": "bd61848900bff597764238f3a8ec67c815cd316e", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/core/devmem.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.16"}, {"lessThan": "6.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.35", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.11", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "7BC83D47-7720-40AC-85ED-873326493894", "versionEndExcluding": "6.18.35", "versionStartIncluding": "6.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0520D091-FC52-4A50-AF07-70AE7D08B750", "versionEndExcluding": "7.0.11", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*", "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*", "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*", "matchCriteriaId": "E5910A9D-F60A-409A-B486-FE66BFEBA9B9", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: devmem: reject dma-buf bind with non-page-aligned size or SG length\n\nnet_devmem_bind_dmabuf() trusts dmabuf->size and sg_dma_len() to be\nPAGE_SIZE multiples without checking:\n\n - tx_vec is sized dmabuf->size / PAGE_SIZE, and\n net_devmem_get_niov_at() only bounds-checks virt_addr < dmabuf->size\n before indexing tx_vec[virt_addr / PAGE_SIZE]. With size =\n N*PAGE_SIZE + r (1 <= r < PAGE_SIZE), sendmsg() at iov_base =\n N*PAGE_SIZE passes the bound check and reads tx_vec[N] -- one past.\n\n - owner->area.num_niovs = len / PAGE_SIZE while gen_pool_add_owner()\n covers the full byte len, so a non-page-multiple non-final sg\n desyncs num_niovs from the gen_pool region for every later sg, on\n both RX and TX.\n\ndma-buf does not require page-aligned sizes, so the bind path has to\nenforce what its own indexing assumes. Reject both with -EINVAL.\n\nThe size check is TX-only (only tx_vec is sized off dmabuf->size); the\nSG-length check covers both directions."}], "id": "CVE-2026-64124", "lastModified": "2026-08-13T15:11:27.950", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-19T16:17:54.030", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/134c517dfa63203287b2aad6558017f42435a02e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4eb82ba543421e9e38cc14e4e82058b78850df50"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d5008e4e4ee6b739256b796702a7d1aae1b5c3b4"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: devmem: reject dma-buf bind with non-page-aligned size or SG length", "id": "2502601", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502601"}, "csaw": false, "cwe": "CWE-125", "details": ["A flaw was found in the Linux kernel's network device memory (net: devmem) component. This vulnerability allows an attacker to trigger an out-of-bounds read by providing specially crafted Direct Memory Access (DMA) buffers with non-page-aligned sizes or Scatter-Gather (SG) list lengths. This could lead to information disclosure or memory corruption, potentially impacting system stability and data integrity."], "name": "CVE-2026-64124", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "impact": "important", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64124\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64124\nhttps://lore.kernel.org/linux-cve-announce/2026071925-CVE-2026-64124-0de6@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bd61848900bff597764238f3a8ec67c815cd316e,134c517dfa63203287b2aad6558017f42435a02e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bd61848900bff597764238f3a8ec67c815cd316e,d5008e4e4ee6b739256b796702a7d1aae1b5c3b4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bd61848900bff597764238f3a8ec67c815cd316e,4eb82ba543421e9e38cc14e4e82058b78850df50)"}}], "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": "6.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.35,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0.11,7.0.*]"}}, {"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": "2026-07-21T10:30:04.754516+00:00", "updated": "2026-08-13T18:15:04.841691+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}