{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53676", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-10-07T15:16:59.664Z", "datePublished": "2025-10-07T15:21:31.757Z", "dateUpdated": "2026-08-05T09:15:29.713Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:15:29.713Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: iscsi: Fix buffer overflow in lio_target_nacl_info_show()\n\nThe function lio_target_nacl_info_show() uses sprintf() in a loop to print\ndetails for every iSCSI connection in a session without checking for the\nbuffer length. With enough iSCSI connections it's possible to overflow the\nbuffer provided by configfs and corrupt the memory.\n\nThis patch replaces sprintf() with sysfs_emit_at() that checks for buffer\nboundries." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The attacker-controlled state that causes the overflow — the number of MC/S connections on a session, plus the InitiatorName/InitiatorAlias/CID/peer-address bytes written OOB — is delivered entirely over TCP/3260 to the network-bound LIO iSCSI target from an arbitrary number of network hops away. This is the stored-payload pattern: the payload is planted remotely at the iSCSI protocol level and rendered later.\nAC:L - On an MC/S-enabled target (the deployment this was reported against) the attacker deterministically opens the ~25+ connections needed to exceed the 4096-byte page; no race, no memory-layout guess, no unpredictable condition is involved. Each additional login reliably extends the overflow.\nPR:N - iSCSI targets are very commonly run with CHAP disabled (`authentication=0`, or demo mode), and the initiator IQN matching an ACL is merely a string the peer asserts in the login PDU, so an unauthenticated remote peer can establish the multi-connection session. Even the connection-count growth occurs during login processing before any real credential check in that configuration.\nUI:R - The overflow executes when the world-readable configfs attribute `acls//info` is read — by an administrator, targetcli/rtslib, or a monitoring agent — which the remote attacker cannot initiate. That read is routine on managed storage nodes but is still a separate party's action.\nS:U - The corruption is kernel memory overwritten by kernel code within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Unbounded page-overflow with attacker-influenced content into adjacent buddy-allocator pages is a memory-corruption primitive that can be steered into slab objects, pointers, or page metadata and leveraged for arbitrary kernel memory disclosure.\nI:H - This is an out-of-bounds write of attacker-controlled length (scaling with connection count, up to megabytes) with partly attacker-chosen bytes (CIDs, peer addresses, StatSN) past the end of a kernel page, giving a strong write primitive suitable for control-flow hijack.\nA:H - Overwriting arbitrary adjacent kernel pages while holding `conn_lock` and `nacl_sess_lock` reliably corrupts unrelated kernel state and causes oops/panic; the attacker can repeat it on every read." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/target/iscsi/iscsi_target_configfs.c" ], "versions": [ { "version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "df349e84c2cb0dd05d98c8e1189c26ab4b116083", "status": "affected", "versionType": "git" }, { "version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "114b44dddea1f8f99576de3c0e6e9059012002fc", "status": "affected", "versionType": "git" }, { "version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "2cbe6a88fbdd6e8aeab358eef61472e2de43d6f6", "status": "affected", "versionType": "git" }, { "version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "bbe3ff47bf09db8956bc2eeb49d2d514d256ad2a", "status": "affected", "versionType": "git" }, { "version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "5353df78c22623b42a71d51226d228a8413097e2", "status": "affected", "versionType": "git" }, { "version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "4738bf8b2d3635c2944b81b2a84d97b8c8b0978d", "status": "affected", "versionType": "git" }, { "version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "0cac6cbb9908309352a5d30c1876882771d3da50", "status": "affected", "versionType": "git" }, { "version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "801f287c93ff95582b0a2d2163f12870a2f076d4", "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/target/iscsi/iscsi_target_configfs.c" ], "versions": [ { "version": "3.1", "status": "affected" }, { "version": "0", "lessThan": "3.1", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.326", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.295", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.257", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.197", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.133", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.55", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5.5", "lessThanOrEqual": "6.5.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6", "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": "3.1", "versionEndExcluding": "4.14.326" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "4.19.295" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "5.4.257" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "5.10.197" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "5.15.133" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.1.55" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.5.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.6" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/df349e84c2cb0dd05d98c8e1189c26ab4b116083" }, { "url": "https://git.kernel.org/stable/c/114b44dddea1f8f99576de3c0e6e9059012002fc" }, { "url": "https://git.kernel.org/stable/c/2cbe6a88fbdd6e8aeab358eef61472e2de43d6f6" }, { "url": "https://git.kernel.org/stable/c/bbe3ff47bf09db8956bc2eeb49d2d514d256ad2a" }, { "url": "https://git.kernel.org/stable/c/5353df78c22623b42a71d51226d228a8413097e2" }, { "url": "https://git.kernel.org/stable/c/4738bf8b2d3635c2944b81b2a84d97b8c8b0978d" }, { "url": "https://git.kernel.org/stable/c/0cac6cbb9908309352a5d30c1876882771d3da50" }, { "url": "https://git.kernel.org/stable/c/801f287c93ff95582b0a2d2163f12870a2f076d4" } ], "title": "scsi: target: iscsi: Fix buffer overflow in lio_target_nacl_info_show()", "x_generator": { "engine": "bippy-1.2.0" } } } }