{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-23193", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.985Z", "datePublished": "2026-02-14T16:27:20.251Z", "dateUpdated": "2026-08-05T12:20:35.890Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:20:35.890Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count()\n\nIn iscsit_dec_session_usage_count(), the function calls complete() while\nholding the sess->session_usage_lock. Similar to the connection usage count\nlogic, the waiter signaled by complete() (e.g., in the session release\npath) may wake up and free the iscsit_session structure immediately.\n\nThis creates a race condition where the current thread may attempt to\nexecute spin_unlock_bh() on a session structure that has already been\ndeallocated, resulting in a KASAN slab-use-after-free.\n\nTo resolve this, release the session_usage_lock before calling complete()\nto ensure all dereferences of the sess pointer are finished before the\nwaiter is allowed to proceed with deallocation." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The iSCSI target is a network-facing service listening on TCP port 3260. An authenticated remote initiator can trigger session logout or reinstatement flows that reach the vulnerable function.\nAC:L - The race condition is inherent in the code path — whenever session_usage_count reaches 0 with a waiter, the UAF occurs deterministically because complete() wakes the waiter before spin_unlock_bh(). The attacker triggers this by initiating session logout, and the bug fires reliably.\nPR:L - An iSCSI initiator must authenticate (via CHAP or ACL) before establishing a session. Only authenticated sessions can trigger logout/reinstatement paths that call iscsit_dec_session_usage_count().\nUI:N - No user interaction is required. The attacker directly connects to the iSCSI target service, authenticates, and triggers session logout or reinstatement.\nS:U - The vulnerability affects the kernel within the same security authority. There is no crossing of a VM boundary or sandbox escape.\nC:H - This is a use-after-free on a kernel heap object (iscsit_session structure). UAFs allow an attacker to control freed object contents via heap spraying, potentially enabling arbitrary kernel memory reads.\nI:H - The use-after-free on the session structure enables heap spraying attacks that can achieve arbitrary write primitives and control flow hijacking in kernel context.\nA:H - The use-after-free causes a KASAN slab-use-after-free (as reported), which results in a kernel crash/oops, causing complete denial of service." } ] } ], "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_util.c" ], "versions": [ { "version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "2b64015550a13bcc72910be0565548d9a754d46d", "status": "affected", "versionType": "git" }, { "version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "fd8b0900173307039d3a84644c2fee041a7ed4fb", "status": "affected", "versionType": "git" }, { "version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "d8dbdc146e9e9a976931b78715be2e91299049f9", "status": "affected", "versionType": "git" }, { "version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "11ebafffce31efc6abeb28c509017976fc49f1ca", "status": "affected", "versionType": "git" }, { "version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "41b86a9ec037bd3435d68dd3692f0891a207e7e7", "status": "affected", "versionType": "git" }, { "version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "4530f4e4d0e6a207110b0ffed0c911bca43531a4", "status": "affected", "versionType": "git" }, { "version": "e48354ce078c079996f89d715dfa44814b4eba01", "lessThan": "84dc6037390b8607c5551047d3970336cb51ba9a", "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_util.c" ], "versions": [ { "version": "3.1", "status": "affected" }, { "version": "0", "lessThan": "3.1", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.250", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.200", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.163", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.124", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.70", "lessThanOrEqual": "6.12.*", "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": "3.1", "versionEndExcluding": "5.10.250" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "5.15.200" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.1.163" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.6.124" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.12.70" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.18.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1", "versionEndExcluding": "6.19" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/2b64015550a13bcc72910be0565548d9a754d46d" }, { "url": "https://git.kernel.org/stable/c/fd8b0900173307039d3a84644c2fee041a7ed4fb" }, { "url": "https://git.kernel.org/stable/c/d8dbdc146e9e9a976931b78715be2e91299049f9" }, { "url": "https://git.kernel.org/stable/c/11ebafffce31efc6abeb28c509017976fc49f1ca" }, { "url": "https://git.kernel.org/stable/c/41b86a9ec037bd3435d68dd3692f0891a207e7e7" }, { "url": "https://git.kernel.org/stable/c/4530f4e4d0e6a207110b0ffed0c911bca43531a4" }, { "url": "https://git.kernel.org/stable/c/84dc6037390b8607c5551047d3970336cb51ba9a" } ], "title": "scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-06-16T20:19:30.330319Z", "id": "CVE-2026-23193", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-16T20:19:39.064Z" } } ] } }