{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23259", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.990Z", "datePublished": "2026-03-18T17:41:05.827Z", "dateUpdated": "2026-05-11T22:03:23.984Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T22:03:23.984Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/rw: free potentially allocated iovec on cache put failure\n\nIf a read/write request goes through io_req_rw_cleanup() and has an\nallocated iovec attached and fails to put to the rw_cache, then it may\nend up with an unaccounted iovec pointer. Have io_rw_recycle() return\nwhether it recycled the request or not, and use that to gauge whether to\nfree a potential iovec or not."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["io_uring/rw.c"], "versions": [{"version": "a9165b83c1937eeed1f0c731468216d6371d647f", "lessThan": "1d5f2329ab4df65c2ee011b986d8a6e05ad0f67c", "status": "affected", "versionType": "git"}, {"version": "a9165b83c1937eeed1f0c731468216d6371d647f", "lessThan": "4b9748055457ac3a0710bf210c229d01ea1b01b9", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["io_uring/rw.c"], "versions": [{"version": "6.10", "status": "affected"}, {"version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.10", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19", "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": "6.10", "versionEndExcluding": "6.18.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.19"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1d5f2329ab4df65c2ee011b986d8a6e05ad0f67c"}, {"url": "https://git.kernel.org/stable/c/4b9748055457ac3a0710bf210c229d01ea1b01b9"}], "title": "io_uring/rw: free potentially allocated iovec on cache put failure", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/rw: free potentially allocated iovec on cache put failure\n\nIf a read/write request goes through io_req_rw_cleanup() and has an\nallocated iovec attached and fails to put to the rw_cache, then it may\nend up with an unaccounted iovec pointer. Have io_rw_recycle() return\nwhether it recycled the request or not, and use that to gauge whether to\nfree a potential iovec or not."}], "id": "CVE-2026-23259", "lastModified": "2026-03-19T13:25:00.570", "metrics": {}, "published": "2026-03-18T18:16:24.353", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1d5f2329ab4df65c2ee011b986d8a6e05ad0f67c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4b9748055457ac3a0710bf210c229d01ea1b01b9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: io_uring/rw: free potentially allocated iovec on cache put failure", "id": "2448689", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448689"}, "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"}, "details": ["No description is available for this CVE."], "name": "CVE-2026-23259", "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": "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": "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": "2026-03-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23259\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23259\nhttps://lore.kernel.org/linux-cve-announce/2026031819-CVE-2026-23259-5bd7@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,1d5f2329ab4df65c2ee011b986d8a6e05ad0f67c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,4b9748055457ac3a0710bf210c229d01ea1b01b9)"}}], "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": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.10,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.19,*]"}}], "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"}], "analysis": {"en": {"generated_at": "2026-03-27T21:47:38.650587+00:00", "value": {"mitigation_remediation": ["Apply the latest Linux kernel that includes the fixed commit 1d5f2329.", "If kernel upgrade is not an immediate option, consider disabling or limiting io_uring usage until the patch can be applied.", "Monitor system logs for io_uring cache put failures and watch for memory growth."], "summary": {"action": "Apply Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Affected systems are Linux kernel implementations that use the io_uring subsystem, specifically the rw_cache component. The issue appears in all kernel releases prior to the inclusion of the commit that resolves the problem; a specific version range is not provided. Systems running a kernel without the fix are susceptible.", "description_and_impact": "This vulnerability arises when a read or write request processed by io_uring's cleanup routine fails to be stored in the rw_cache yet an I/O vector (ovec) has been allocated. Because the cleanup path does not free the leftover iovec, each failure results in a retained memory allocation. Over time, repeated failures can cause unreclaimed kernel memory usage to grow, degrading system stability. The root weakness is a memory leak, which can lead to resource exhaustion.", "risk_and_exploitability": "The CVSS score of 5.5 indicates moderate severity. EPSS indicates that the likelihood of exploitation is very low (<1\u202f%) and the vulnerability is not listed in the CISA KEV catalog. A local attacker who can generate numerous io_uring read/write operations that fail to cache could exploit the bug, causing memory exhaustion and potential denial of service. The attack vector is inferred to be local and related to kernel I/O handling; no remote exploitation pathway is described."}}}}, "created": "2026-03-19T08:55:59.951100+00:00", "updated": "2026-03-29T20:29:00.511403+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-401", "CWE-204"]}