CVE-2026-74719

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74719", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.929Z", "datePublished": "2026-08-22T15:33:12.716Z", "dateUpdated": "2026-08-22T15:33:12.716Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-22T15:33:12.716Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in smc_llc_event_handler()\n\nThe SMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT branch in\nsmc_llc_event_handler() stores an incoming qentry into the local LLC flow\nwithout first checking whether a qentry is already pending. If a malicious or\nbuggy peer sends a second CONFIRM_LINK or ADD_LINK_CONT request while a flow is\nactive and flow->qentry is already set, smc_llc_flow_qentry_set() overwrites the\npointer without freeing the previous allocation, leaking one kmalloc-96 object\nper spurious message.\n\nThe sibling SMC_LLC_DELETE_LINK branch already has the correct !flow->qentry\nguard. Apply the same guard to the CONFIRM_LINK/ADD_LINK_CONT branch so that a\nduplicate message when qentry is already occupied falls through to break and is\nfreed by the kfree(qentry) at the out: label, rather than silently leaking the\nexisting allocation.\n\nThe response direction (smc_llc_rx_response()) is unaffected: it already guards\nwith flow->qentry at the equivalent site and drops duplicate responses\ncorrectly."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/smc/smc_llc.c"], "versions": [{"version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "lessThan": "e384f3cba6ea709f5b2272b1770db4ce14047f78", "status": "affected", "versionType": "git"}, {"version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "lessThan": "a1e980d7a9e7ee6faf4f5fd7b450413b969af26d", "status": "affected", "versionType": "git"}, {"version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "lessThan": "e0eb87677c76b157cdf8eb7c1f19e56227165a33", "status": "affected", "versionType": "git"}, {"version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "lessThan": "06734dfeaeba886aab1bf147249195b888ac3e4d", "status": "affected", "versionType": "git"}, {"version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "lessThan": "c23c409228629107203d3c3e95fff1473173f1a6", "status": "affected", "versionType": "git"}, {"version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "lessThan": "10cb31b2b74cb664c6c95cf72364d7d5c483ab82", "status": "affected", "versionType": "git"}, {"version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "lessThan": "bfc336a9fbbf09805f3dfe25c195a4db90af2846", "status": "affected", "versionType": "git"}, {"version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "lessThan": "976245094925bab9bc39366b2e9ab44ffcde61d0", "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/smc/smc_llc.c"], "versions": [{"version": "5.8", "status": "affected"}, {"version": "0", "lessThan": "5.8", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.152", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "5.8", "versionEndExcluding": "5.10.265"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.6.152"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.12.104"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/e384f3cba6ea709f5b2272b1770db4ce14047f78"}, {"url": "https://git.kernel.org/stable/c/a1e980d7a9e7ee6faf4f5fd7b450413b969af26d"}, {"url": "https://git.kernel.org/stable/c/e0eb87677c76b157cdf8eb7c1f19e56227165a33"}, {"url": "https://git.kernel.org/stable/c/06734dfeaeba886aab1bf147249195b888ac3e4d"}, {"url": "https://git.kernel.org/stable/c/c23c409228629107203d3c3e95fff1473173f1a6"}, {"url": "https://git.kernel.org/stable/c/10cb31b2b74cb664c6c95cf72364d7d5c483ab82"}, {"url": "https://git.kernel.org/stable/c/bfc336a9fbbf09805f3dfe25c195a4db90af2846"}, {"url": "https://git.kernel.org/stable/c/976245094925bab9bc39366b2e9ab44ffcde61d0"}], "title": "net/smc: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in smc_llc_event_handler()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/smc/smc_llc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "e384f3cba6ea709f5b2272b1770db4ce14047f78", "status": "affected", "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "versionType": "git"}, {"lessThan": "a1e980d7a9e7ee6faf4f5fd7b450413b969af26d", "status": "affected", "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "versionType": "git"}, {"lessThan": "e0eb87677c76b157cdf8eb7c1f19e56227165a33", "status": "affected", "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "versionType": "git"}, {"lessThan": "06734dfeaeba886aab1bf147249195b888ac3e4d", "status": "affected", "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "versionType": "git"}, {"lessThan": "c23c409228629107203d3c3e95fff1473173f1a6", "status": "affected", "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "versionType": "git"}, {"lessThan": "10cb31b2b74cb664c6c95cf72364d7d5c483ab82", "status": "affected", "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "versionType": "git"}, {"lessThan": "bfc336a9fbbf09805f3dfe25c195a4db90af2846", "status": "affected", "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "versionType": "git"}, {"lessThan": "976245094925bab9bc39366b2e9ab44ffcde61d0", "status": "affected", "version": "0fb0b02bd6fd26cba38002be4a6bbcae2228fd44", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/smc/smc_llc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.8"}, {"lessThan": "5.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.265", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.216", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.183", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.152", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.104", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.45", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "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\nnet/smc: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in smc_llc_event_handler()\n\nThe SMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT branch in\nsmc_llc_event_handler() stores an incoming qentry into the local LLC flow\nwithout first checking whether a qentry is already pending. If a malicious or\nbuggy peer sends a second CONFIRM_LINK or ADD_LINK_CONT request while a flow is\nactive and flow->qentry is already set, smc_llc_flow_qentry_set() overwrites the\npointer without freeing the previous allocation, leaking one kmalloc-96 object\nper spurious message.\n\nThe sibling SMC_LLC_DELETE_LINK branch already has the correct !flow->qentry\nguard. Apply the same guard to the CONFIRM_LINK/ADD_LINK_CONT branch so that a\nduplicate message when qentry is already occupied falls through to break and is\nfreed by the kfree(qentry) at the out: label, rather than silently leaking the\nexisting allocation.\n\nThe response direction (smc_llc_rx_response()) is unaffected: it already guards\nwith flow->qentry at the equivalent site and drops duplicate responses\ncorrectly."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/smc: correcci\u00f3n de sobrescritura de qentry para CONFIRM_LINK y ADD_LINK_CONT en smc_llc_event_handler()\n\nLa rama SMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT en smc_llc_event_handler() almacena un qentry entrante en el flujo LLC local sin verificar primero si un qentry ya est\u00e1 pendiente. Si un par malicioso o defectuoso env\u00eda una segunda solicitud CONFIRM_LINK o ADD_LINK_CONT mientras un flujo est\u00e1 activo y flow -> qentry ya est\u00e1 establecido, smc_llc_flow_qentry_set() sobrescribe el puntero sin liberar la asignaci\u00f3n anterior, fugando un objeto kmalloc-96 por mensaje espurio.\n\nLa rama hermana SMC_LLC_DELETE_LINK ya tiene la protecci\u00f3n !flow -> qentry correcta. Aplique la misma protecci\u00f3n a la rama CONFIRM_LINK/ADD_LINK_CONT para que un mensaje duplicado, cuando qentry ya est\u00e1 ocupado, pase a 'break' y sea liberado por kfree(qentry) en la etiqueta 'out:', en lugar de fugar silenciosamente la asignaci\u00f3n existente.\n\nLa direcci\u00f3n de respuesta (smc_llc_rx_response()) no se ve afectada: ya se protege con flow -> qentry en el sitio equivalente y descarta las respuestas duplicadas correctamente."}], "id": "CVE-2026-74719", "lastModified": "2026-10-14T13:10:00.187", "metrics": {}, "published": "2026-08-22T16:16:46.830", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/06734dfeaeba886aab1bf147249195b888ac3e4d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/10cb31b2b74cb664c6c95cf72364d7d5c483ab82"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/976245094925bab9bc39366b2e9ab44ffcde61d0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a1e980d7a9e7ee6faf4f5fd7b450413b969af26d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bfc336a9fbbf09805f3dfe25c195a4db90af2846"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c23c409228629107203d3c3e95fff1473173f1a6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e0eb87677c76b157cdf8eb7c1f19e56227165a33"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e384f3cba6ea709f5b2272b1770db4ce14047f78"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: net/smc: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in smc_llc_event_handler()", "id": "2521392", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521392"}, "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-772", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/smc: fix qentry overwrite for CONFIRM_LINK and ADD_LINK_CONT in smc_llc_event_handler()\nThe SMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT branch in\nsmc_llc_event_handler() stores an incoming qentry into the local LLC flow\nwithout first checking whether a qentry is already pending. If a malicious or\nbuggy peer sends a second CONFIRM_LINK or ADD_LINK_CONT request while a flow is\nactive and flow->qentry is already set, smc_llc_flow_qentry_set() overwrites the\npointer without freeing the previous allocation, leaking one kmalloc-96 object\nper spurious message.\nThe sibling SMC_LLC_DELETE_LINK branch already has the correct !flow->qentry\nguard. Apply the same guard to the CONFIRM_LINK/ADD_LINK_CONT branch so that a\nduplicate message when qentry is already occupied falls through to break and is\nfreed by the kfree(qentry) at the out: label, rather than silently leaking the\nexisting allocation.\nThe response direction (smc_llc_rx_response()) is unaffected: it already guards\nwith flow->qentry at the equivalent site and drops duplicate responses\ncorrectly.", "A flaw was found in the Linux kernel's Server Message Block (SMB) over Remote Direct Memory Access (RDMA) (SMC) protocol implementation. A remote attacker, by sending a duplicate link confirmation or addition request, can cause a memory leak. This occurs because the system overwrites an existing memory allocation without freeing the previous one, potentially leading to a denial of service over time due to resource exhaustion."], "name": "CVE-2026-74719", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74719\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74719\nhttps://lore.kernel.org/linux-cve-announce/2026082239-CVE-2026-74719-d1ee@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0fb0b02bd6fd26cba38002be4a6bbcae2228fd44,e384f3cba6ea709f5b2272b1770db4ce14047f78)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0fb0b02bd6fd26cba38002be4a6bbcae2228fd44,a1e980d7a9e7ee6faf4f5fd7b450413b969af26d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0fb0b02bd6fd26cba38002be4a6bbcae2228fd44,e0eb87677c76b157cdf8eb7c1f19e56227165a33)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0fb0b02bd6fd26cba38002be4a6bbcae2228fd44,06734dfeaeba886aab1bf147249195b888ac3e4d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0fb0b02bd6fd26cba38002be4a6bbcae2228fd44,c23c409228629107203d3c3e95fff1473173f1a6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0fb0b02bd6fd26cba38002be4a6bbcae2228fd44,10cb31b2b74cb664c6c95cf72364d7d5c483ab82)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0fb0b02bd6fd26cba38002be4a6bbcae2228fd44,bfc336a9fbbf09805f3dfe25c195a4db90af2846)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0fb0b02bd6fd26cba38002be4a6bbcae2228fd44,976245094925bab9bc39366b2e9ab44ffcde61d0)"}}], "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": "5.8"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.8)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.265,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.216,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.183,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.152,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.104,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "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": "2026-08-22T18:30:16.836994+00:00", "updated": "2026-08-25T14:45:03.954265+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}