{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89743", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.761Z", "datePublished": "2026-09-11T19:46:49.261Z", "dateUpdated": "2026-09-11T19:46:49.261Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:46:49.261Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: nsm: bound the device-reported response length\n\nnsm_sendrecv_msg_locked() stores the virtqueue used-ring length reported\nby the NSM device into msg->resp.len without bounding it to the response\nbuffer. A malicious or buggy backend can report a length larger than the\nresponse buffer; parse_resp_raw() then copies that many bytes out of the\nfixed buffer to user space, disclosing adjacent kernel heap (an\nout-of-bounds read). The request path already floors its length in\nfill_req_raw(); the response path lacks the symmetric check.\n\nClamp the stored length to the size of the response buffer. Well-behaved\ndevices report no more than the posted buffer size, so conforming traffic\nis unaffected."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/misc/nsm.c"], "versions": [{"version": "b9873755a6c8ccfce79094c4dce9efa3ecb1a749", "lessThan": "339f19b9a6171289b0e797deb8bda80b9a1fcc30", "status": "affected", "versionType": "git"}, {"version": "b9873755a6c8ccfce79094c4dce9efa3ecb1a749", "lessThan": "29e634a18957acda11383a15ab98a91c4ae9e294", "status": "affected", "versionType": "git"}, {"version": "b9873755a6c8ccfce79094c4dce9efa3ecb1a749", "lessThan": "2aa0fb9c96f894a9c179a48e7522ea6705800adf", "status": "affected", "versionType": "git"}, {"version": "b9873755a6c8ccfce79094c4dce9efa3ecb1a749", "lessThan": "808e530654a5354e6df78863a5d61e4d44e67235", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/misc/nsm.c"], "versions": [{"version": "6.8", "status": "affected"}, {"version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "6.8", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/339f19b9a6171289b0e797deb8bda80b9a1fcc30"}, {"url": "https://git.kernel.org/stable/c/29e634a18957acda11383a15ab98a91c4ae9e294"}, {"url": "https://git.kernel.org/stable/c/2aa0fb9c96f894a9c179a48e7522ea6705800adf"}, {"url": "https://git.kernel.org/stable/c/808e530654a5354e6df78863a5d61e4d44e67235"}], "title": "misc: nsm: bound the device-reported response length", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/misc/nsm.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "339f19b9a6171289b0e797deb8bda80b9a1fcc30", "status": "affected", "version": "b9873755a6c8ccfce79094c4dce9efa3ecb1a749", "versionType": "git"}, {"lessThan": "29e634a18957acda11383a15ab98a91c4ae9e294", "status": "affected", "version": "b9873755a6c8ccfce79094c4dce9efa3ecb1a749", "versionType": "git"}, {"lessThan": "2aa0fb9c96f894a9c179a48e7522ea6705800adf", "status": "affected", "version": "b9873755a6c8ccfce79094c4dce9efa3ecb1a749", "versionType": "git"}, {"lessThan": "808e530654a5354e6df78863a5d61e4d44e67235", "status": "affected", "version": "b9873755a6c8ccfce79094c4dce9efa3ecb1a749", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/misc/nsm.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.8"}, {"lessThan": "6.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: nsm: bound the device-reported response length\n\nnsm_sendrecv_msg_locked() stores the virtqueue used-ring length reported\nby the NSM device into msg->resp.len without bounding it to the response\nbuffer. A malicious or buggy backend can report a length larger than the\nresponse buffer; parse_resp_raw() then copies that many bytes out of the\nfixed buffer to user space, disclosing adjacent kernel heap (an\nout-of-bounds read). The request path already floors its length in\nfill_req_raw(); the response path lacks the symmetric check.\n\nClamp the stored length to the size of the response buffer. Well-behaved\ndevices report no more than the posted buffer size, so conforming traffic\nis unaffected."}], "id": "CVE-2026-89743", "lastModified": "2026-09-11T20:20:04.997", "metrics": {}, "published": "2026-09-11T20:20:04.997", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/29e634a18957acda11383a15ab98a91c4ae9e294"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2aa0fb9c96f894a9c179a48e7522ea6705800adf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/339f19b9a6171289b0e797deb8bda80b9a1fcc30"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/808e530654a5354e6df78863a5d61e4d44e67235"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: NSM information disclosure via out-of-bounds read", "id": "2532206", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532206"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in the Linux kernel's Network Shared Memory (NSM) component. A malicious or buggy backend can report a response length larger than the allocated buffer. This can lead to an out-of-bounds read, disclosing adjacent kernel memory to user space. This vulnerability results in information disclosure."], "name": "CVE-2026-89743", "public_date": "2026-09-11T19:46:49Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89743\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89743\nhttps://git.kernel.org/stable/c/29e634a18957acda11383a15ab98a91c4ae9e294\nhttps://git.kernel.org/stable/c/2aa0fb9c96f894a9c179a48e7522ea6705800adf\nhttps://git.kernel.org/stable/c/339f19b9a6171289b0e797deb8bda80b9a1fcc30\nhttps://git.kernel.org/stable/c/808e530654a5354e6df78863a5d61e4d44e67235"], "threat_severity": "Moderate"}

{}