CVE-2025-38075 (GCVE-0-2025-38075)

Vulnerability from cvelistv5 – Published: 2025-06-18 09:33 – Updated: 2026-08-05 11:59
VLAI
Title
scsi: target: iscsi: Fix timeout on deleted connection
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Fix timeout on deleted connection NOPIN response timer may expire on a deleted connection and crash with such logs: Did not receive response to NOPIN on CID: 0, failing connection for I_T Nexus (null),i,0x00023d000125,iqn.2017-01.com.iscsi.target,t,0x3d BUG: Kernel NULL pointer dereference on read at 0x00000000 NIP strlcpy+0x8/0xb0 LR iscsit_fill_cxn_timeout_err_stats+0x5c/0xc0 [iscsi_target_mod] Call Trace: iscsit_handle_nopin_response_timeout+0xfc/0x120 [iscsi_target_mod] call_timer_fn+0x58/0x1f0 run_timer_softirq+0x740/0x860 __do_softirq+0x16c/0x420 irq_exit+0x188/0x1c0 timer_interrupt+0x184/0x410 That is because nopin response timer may be re-started on nopin timer expiration. Stop nopin timer before stopping the nopin response timer to be sure that no one of them will be re-started.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e48354ce078c079996f89d715dfa44814b4eba01 , < 571ce6b6f5cbaf7d24af03cad592fc0e2a54de35 (git)
Affected: e48354ce078c079996f89d715dfa44814b4eba01 , < 2c5081439c7ab8da08427befe427f0d732ebc9f9 (git)
Affected: e48354ce078c079996f89d715dfa44814b4eba01 , < 019ca2804f3fb49a7f8e56ea6aeaa1ff32724c27 (git)
Affected: e48354ce078c079996f89d715dfa44814b4eba01 , < 6815846e0c3a62116a7da9740e3a7c10edc5c7e9 (git)
Affected: e48354ce078c079996f89d715dfa44814b4eba01 , < fe8421e853ef289e1324fcda004751c89dd9c18a (git)
Affected: e48354ce078c079996f89d715dfa44814b4eba01 , < 87389bff743c55b6b85282de91109391f43e0814 (git)
Affected: e48354ce078c079996f89d715dfa44814b4eba01 , < 3e6429e3707943078240a2c0c0b3ee99ea9b0d9c (git)
Affected: e48354ce078c079996f89d715dfa44814b4eba01 , < 7f533cc5ee4c4436cee51dc58e81dfd9c3384418 (git)
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Linux Linux Affected: 3.1
Unaffected: 0 , < 3.1 (semver)
Unaffected: 5.4.294 , ≤ 5.4.* (semver)
Unaffected: 5.10.238 , ≤ 5.10.* (semver)
Unaffected: 5.15.185 , ≤ 5.15.* (semver)
Unaffected: 6.1.141 , ≤ 6.1.* (semver)
Unaffected: 6.6.93 , ≤ 6.6.* (semver)
Unaffected: 6.12.31 , ≤ 6.12.* (semver)
Unaffected: 6.14.9 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: iscsi: Fix timeout on deleted connection\n\nNOPIN response timer may expire on a deleted connection and crash with\nsuch logs:\n\nDid not receive response to NOPIN on CID: 0, failing connection for I_T Nexus (null),i,0x00023d000125,iqn.2017-01.com.iscsi.target,t,0x3d\n\nBUG: Kernel NULL pointer dereference on read at 0x00000000\nNIP  strlcpy+0x8/0xb0\nLR iscsit_fill_cxn_timeout_err_stats+0x5c/0xc0 [iscsi_target_mod]\nCall Trace:\n iscsit_handle_nopin_response_timeout+0xfc/0x120 [iscsi_target_mod]\n call_timer_fn+0x58/0x1f0\n run_timer_softirq+0x740/0x860\n __do_softirq+0x16c/0x420\n irq_exit+0x188/0x1c0\n timer_interrupt+0x184/0x410\n\nThat is because nopin response timer may be re-started on nopin timer\nexpiration.\n\nStop nopin timer before stopping the nopin response timer to be sure\nthat no one of them will be re-started."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The LIO in-kernel iSCSI target serves remote initiators over TCP/3260, and every element of the trigger \u2014 login, the NOP-Out replies that drive the NOPIN timer state machine, and the abrupt connection teardown that enters iscsit_close_connection() \u2014 is performed by the remote peer over the network.\nAC:L - The attacker controls both sides of the race: replying to a target NOPIN restarts the known-duration nopin timer (iscsi_target.c:1817) so its expiry is exactly predictable, and the attacker then forces connection close at that instant by aborting TCP, retrying across thousands of parallel connections. The condition also occurs spontaneously in production, confirming no attacker-uncontrollable precondition.\nPR:N - iSCSI target portal groups are routinely deployed with authentication=0 (AuthMethod=None) and generate_node_acls=1 demo mode, in which any host reaching TCP/3260 completes a normal-session login with no credentials or authorization check whatsoever, which is all that is needed to start the nopin timers and drive the race.\nUI:N - The remote attacker performs the entire sequence \u2014 login, NOP-Out exchange, and connection abort \u2014 with no action by any local user or administrator.\nS:U - The use-after-free corrupts kernel slab memory within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The armed nopin_response_timer resides inside the kfree\u0027d struct iscsit_conn, and its handler chases conn-\u003esess, sess-\u003esess_ops-\u003eInitiatorName, and sess-\u003etpg-\u003etpg_tiqn entirely through freed memory; with the freed slab sprayed this yields arbitrary kernel-memory reads that are copied into tiqn-\u003esess_err_stats.last_sess_fail_rem_name, exposed via configfs stats.\nI:H - The same UAF supplies write primitives \u2014 iscsit_inc_conn_usage_count() writes into the freed object, the timer wheel manipulates list pointers in freed memory and calls t-\u003efunction read from it (control-flow hijack from softirq), and strscpy() writes attacker-influenced data to an address taken from the sprayed sess-\u003etpg-\u003etpg_tiqn chain, with a ~30-second grooming window between free and expiry.\nA:H - The commit documents a reproducible kernel NULL-pointer dereference oops in softirq context (strlcpy via iscsit_fill_cxn_timeout_err_stats from run_timer_softirq), and the underlying use-after-free on freed conn and session objects readily panics the host, an outage repeatable at will by a remote attacker."
            }
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        "dateUpdated": "2026-08-05T11:59:15.945Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/571ce6b6f5cbaf7d24af03cad592fc0e2a54de35"
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        {
          "url": "https://git.kernel.org/stable/c/2c5081439c7ab8da08427befe427f0d732ebc9f9"
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        {
          "url": "https://git.kernel.org/stable/c/019ca2804f3fb49a7f8e56ea6aeaa1ff32724c27"
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        {
          "url": "https://git.kernel.org/stable/c/6815846e0c3a62116a7da9740e3a7c10edc5c7e9"
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        {
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      "title": "scsi: target: iscsi: Fix timeout on deleted connection",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38075",
    "datePublished": "2025-06-18T09:33:50.646Z",
    "dateReserved": "2025-04-16T04:51:23.980Z",
    "dateUpdated": "2026-08-05T11:59:15.945Z",
    "state": "PUBLISHED"
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    "epss": {
      "cve": "CVE-2025-38075",
      "date": "2026-08-06",
      "epss": "0.00382",
      "percentile": "0.30917"
    },
    "microsoft_vex": {
      "current_release_date": "2026-02-18T01:55:55.000Z",
      "cve": "CVE-2025-38075",
      "id": "msrc_CVE-2025-38075",
      "initial_release_date": "2025-06-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "scsi: target: iscsi: Fix timeout on deleted connection",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-38075.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38075\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T10:15:40.980\",\"lastModified\":\"2026-07-30T06:22:48.270\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nscsi: target: iscsi: Fix timeout on deleted connection\\n\\nNOPIN response timer may expire on a deleted connection and crash with\\nsuch logs:\\n\\nDid not receive response to NOPIN on CID: 0, failing connection for I_T Nexus (null),i,0x00023d000125,iqn.2017-01.com.iscsi.target,t,0x3d\\n\\nBUG: Kernel NULL pointer dereference on read at 0x00000000\\nNIP  strlcpy+0x8/0xb0\\nLR iscsit_fill_cxn_timeout_err_stats+0x5c/0xc0 [iscsi_target_mod]\\nCall Trace:\\n iscsit_handle_nopin_response_timeout+0xfc/0x120 [iscsi_target_mod]\\n call_timer_fn+0x58/0x1f0\\n run_timer_softirq+0x740/0x860\\n __do_softirq+0x16c/0x420\\n irq_exit+0x188/0x1c0\\n timer_interrupt+0x184/0x410\\n\\nThat is because nopin response timer may be re-started on nopin timer\\nexpiration.\\n\\nStop nopin timer before stopping the nopin response timer to be sure\\nthat no one of them will be re-started.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: scsi: target: iscsi: Se corrige el tiempo de espera en la conexi\u00f3n eliminada. El temporizador de respuesta NOPIN puede expirar en una conexi\u00f3n eliminada y bloquearse con dichos registros: No se recibi\u00f3 respuesta a NOPIN en CID: 0, falla de conexi\u00f3n para I_T Nexus (nulo),i,0x00023d000125,iqn.2017-01.com.iscsi.target,t,0x3d ERROR: Desreferencia de puntero NULL del kernel en lectura en 0x00000000 NIP strlcpy+0x8/0xb0 LR iscsit_fill_cxn_timeout_err_stats+0x5c/0xc0 [iscsi_target_mod] Rastreo de llamadas: iscsit_handle_nopin_response_timeout+0xfc/0x120 [iscsi_target_mod] call_timer_fn+0x58/0x1f0 run_timer_softirq+0x740/0x860 __do_softirq+0x16c/0x420 irq_exit+0x188/0x1c0 timer_interrupt+0x184/0x410 Esto se debe a que el temporizador de respuesta de nopin puede reiniciarse al expirar. Det\u00e9ngalo antes de detener el temporizador de respuesta de nopin para asegurarse de que ninguno de ellos se reinicie.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/target/iscsi/iscsi_target.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e48354ce078c079996f89d715dfa44814b4eba01\",\"lessThan\":\"571ce6b6f5cbaf7d24af03cad592fc0e2a54de35\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e48354ce078c079996f89d715dfa44814b4eba01\",\"lessThan\":\"2c5081439c7ab8da08427befe427f0d732ebc9f9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e48354ce078c079996f89d715dfa44814b4eba01\",\"lessThan\":\"019ca2804f3fb49a7f8e56ea6aeaa1ff32724c27\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e48354ce078c079996f89d715dfa44814b4eba01\",\"lessThan\":\"6815846e0c3a62116a7da9740e3a7c10edc5c7e9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e48354ce078c079996f89d715dfa44814b4eba01\",\"lessThan\":\"fe8421e853ef289e1324fcda004751c89dd9c18a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e48354ce078c079996f89d715dfa44814b4eba01\",\"lessThan\":\"87389bff743c55b6b85282de91109391f43e0814\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e48354ce078c079996f89d715dfa44814b4eba01\",\"lessThan\":\"3e6429e3707943078240a2c0c0b3ee99ea9b0d9c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e48354ce078c079996f89d715dfa44814b4eba01\",\"lessThan\":\"7f533cc5ee4c4436cee51dc58e81dfd9c3384418\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/target/iscsi/iscsi_target.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.1\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.1\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.294\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.238\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.185\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.141\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.93\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.31\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.14.9\",\"lessThanOrEqual\":\"6.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.15\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.1\",\"versionEndExcluding\":\"5.4.294\",\"matchCriteriaId\":\"205CC1B0-7431-4A99-AC3E-D0F16814343A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.238\",\"matchCriteriaId\":\"0DAAEF7F-D560-47FC-8B65-20404DB82432\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.185\",\"matchCriteriaId\":\"E11820B2-24BD-40A8-9E6B-5BC447252321\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.141\",\"matchCriteriaId\":\"7CEA8241-A858-4009-B4EE-31C6277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Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T09:18:36+00:00",
      "cve": "CVE-2025-38075",
      "id": "CVE-2025-38075",
      "initial_release_date": "2025-06-18T00:00:00+00:00",
      "product_status:fixed": "303",
      "product_status:known_affected": "174",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Denial of Service due to NULL pointer dereference in iSCSI target NOPIN timer handling",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38075.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-16T18:43:55Z",
      "cve": "CVE-2025-38075",
      "id": "CVE-2025-38075",
      "initial_release_date": "2025-06-19T03:14:10Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "316",
      "product_status:recommended": "579",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38075",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38075.json",
      "version": "49"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.