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CVE-2026-68141 (GCVE-0-2026-68141)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:59 – Updated: 2026-08-19 16:29
VLAI
Title
net/af_iucv: fix NULL deref in afiucv_hs_callback_syn()
Summary
In the Linux kernel, the following vulnerability has been resolved: net/af_iucv: fix NULL deref in afiucv_hs_callback_syn() afiucv_hs_callback_syn() allocates the child socket with GFP_ATOMIC. If the allocation fails, nsk is NULL. The connection-refused path is entered when the listen state check fails, the accept backlog is full, or nsk is NULL. The code unconditionally calls iucv_sock_kill(nsk) in that path. iucv_sock_kill() does not accept a NULL socket pointer and immediately dereferences sk via sock_flag(sk, SOCK_ZAPPED). When nsk is NULL, calling iucv_sock_kill(nsk) results in a NULL pointer dereference. Only call iucv_sock_kill() when a child socket was successfully allocated.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3881ac441f642d56503818123446f7298442236b , < 6a1eb5b46c19073f8153b7e2c19b408cf353aaf1 (git)
Affected: 3881ac441f642d56503818123446f7298442236b , < c0b6e2ae90613c2fea7eaf3faa20985c6c2a1953 (git)
Affected: 3881ac441f642d56503818123446f7298442236b , < 07e21deb3664001995e0a456dd627ab7dbe127ec (git)
Affected: 3881ac441f642d56503818123446f7298442236b , < 8bb111f87ded6acb9837ec9b45d6f02cda94c51f (git)
Affected: 3881ac441f642d56503818123446f7298442236b , < 46453b16f38ec7147351f7447e2aec6ea330f7b3 (git)
Affected: 3881ac441f642d56503818123446f7298442236b , < 33736ff5e7c97d3348ce812e8bd2e125d840743c (git)
Affected: 3881ac441f642d56503818123446f7298442236b , < 0e857185591fe79934427c9c0c1c31dc776be134 (git)
Affected: 3881ac441f642d56503818123446f7298442236b , < 47a5116e56a6b6fe1e909f244e39cd0fc26ceee4 (git)
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Linux Linux Affected: 3.2
Unaffected: 0 , < 3.2 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/af_iucv: fix NULL deref in afiucv_hs_callback_syn()\n\nafiucv_hs_callback_syn() allocates the child socket with GFP_ATOMIC.\nIf the allocation fails, nsk is NULL.\n\nThe connection-refused path is entered when the listen state check\nfails, the accept backlog is full, or nsk is NULL. The code\nunconditionally calls iucv_sock_kill(nsk) in that path.\n\niucv_sock_kill() does not accept a NULL socket pointer and immediately\ndereferences sk via sock_flag(sk, SOCK_ZAPPED). When nsk is NULL,\ncalling iucv_sock_kill(nsk) results in a NULL pointer dereference.\n\nOnly call iucv_sock_kill() when a child socket was successfully\nallocated."
        }
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            "version": "3.1"
          },
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              "lang": "en",
              "value": "AV:N - The flaw is reached from afiucv_hs_rcv() via dev_add_pack() when ETH_P_AF_IUCV SYN frames arrive on a HiperSockets netdev in netif RX softirq; a remote LPAR/guest on the IBM Z HiperSockets fabric can send these connection requests without local access.\nAC:L - An attacker can repeatedly send SYN packets to a listening AF_IUCV service to pressure GFP_ATOMIC socket allocations until iucv_sock_alloc() fails and the broken connection-refused path runs; no timing race or victim-specific state beyond routine memory pressure is required.\nPR:N - Exploitation requires only sending unauthenticated HiperSockets SYN traffic to a bound/listening AF_IUCV socket; the handshake path has no credential checks and the af_iucv code performs no capability or permission validation before reaching afiucv_hs_callback_syn().\nUI:N - Triggering the NULL dereference needs no action from an end user beyond a service already listening on HiperSockets; the attacker can initiate SYN packets remotely without victim interaction.\nS:U - Impact is a kernel NULL pointer dereference and likely oops/panic in the victim LPAR kernel; it does not cross a VM/host, IOMMU, or sandbox boundary to compromise a different security authority.\nC:N - The failure is an immediate NULL pointer dereference in sock_flag() inside iucv_sock_kill(); there is no memory corruption, out-of-bounds access, or use-after-free that could yield information disclosure.\nI:N - The bug does not write attacker-controlled data or corrupt kernel structures; it only dereferences a NULL socket pointer during cleanup, so no integrity impact or code-execution primitive is created.\nA:H - A NULL dereference in afiucv_hs_callback_syn() during softirq packet processing can cause a kernel oops or panic, denying all service on the affected IBM Z LPAR until reboot."
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        "dateUpdated": "2026-08-19T16:29:59.584Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/6a1eb5b46c19073f8153b7e2c19b408cf353aaf1"
        },
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          "url": "https://git.kernel.org/stable/c/c0b6e2ae90613c2fea7eaf3faa20985c6c2a1953"
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      "title": "net/af_iucv: fix NULL deref in afiucv_hs_callback_syn()",
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    "cveId": "CVE-2026-68141",
    "datePublished": "2026-08-10T11:59:05.051Z",
    "dateReserved": "2026-07-30T09:28:09.370Z",
    "dateUpdated": "2026-08-19T16:29:59.584Z",
    "state": "PUBLISHED"
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When nsk is NULL,\\ncalling iucv_sock_kill(nsk) results in a NULL pointer dereference.\\n\\nOnly call iucv_sock_kill() when a child socket was successfully\\nallocated.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/iucv/af_iucv.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3881ac441f642d56503818123446f7298442236b\",\"lessThan\":\"6a1eb5b46c19073f8153b7e2c19b408cf353aaf1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3881ac441f642d56503818123446f7298442236b\",\"lessThan\":\"c0b6e2ae90613c2fea7eaf3faa20985c6c2a1953\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3881ac441f642d56503818123446f7298442236b\",\"lessThan\":\"07e21deb3664001995e0a456dd627ab7dbe127ec\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3881ac441f642d56503818123446f7298442236b\",\"lessThan\":\"8bb111f87ded6acb9837ec9b45d6f02cda94c51f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3881ac441f642d56503818123446f7298442236b\",\"lessThan\":\"46453b16f38ec7147351f7447e2aec6ea330f7b3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3881ac441f642d56503818123446f7298442236b\",\"lessThan\":\"33736ff5e7c97d3348ce812e8bd2e125d840743c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3881ac441f642d56503818123446f7298442236b\",\"lessThan\":\"0e857185591fe79934427c9c0c1c31dc776be134\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3881ac441f642d56503818123446f7298442236b\",\"lessThan\":\"47a5116e56a6b6fe1e909f244e39cd0fc26ceee4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/iucv/af_iucv.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.2\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.2\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"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:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/07e21deb3664001995e0a456dd627ab7dbe127ec\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0e857185591fe79934427c9c0c1c31dc776be134\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/33736ff5e7c97d3348ce812e8bd2e125d840743c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/46453b16f38ec7147351f7447e2aec6ea330f7b3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/47a5116e56a6b6fe1e909f244e39cd0fc26ceee4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6a1eb5b46c19073f8153b7e2c19b408cf353aaf1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8bb111f87ded6acb9837ec9b45d6f02cda94c51f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c0b6e2ae90613c2fea7eaf3faa20985c6c2a1953\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T11:17:12+00:00",
      "cve": "CVE-2026-68141",
      "id": "CVE-2026-68141",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "261",
      "product_status:known_not_affected": "16",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/af_iucv: fix NULL deref in afiucv_hs_callback_syn()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68141.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:41:13Z",
      "cve": "CVE-2026-68141",
      "id": "CVE-2026-68141",
      "initial_release_date": "2026-08-14T23:45:49Z",
      "product_status:first_fixed": "23",
      "product_status:known_affected": "370",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68141",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68141.json",
      "version": "5"
    }
  }
}



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