CVE-2025-21926 (GCVE-0-2025-21926)

Vulnerability from cvelistv5 – Published: 2025-04-01 15:40 – Updated: 2026-08-05 11:55
VLAI
Title
net: gso: fix ownership in __udp_gso_segment
Summary
In the Linux kernel, the following vulnerability has been resolved: net: gso: fix ownership in __udp_gso_segment In __udp_gso_segment the skb destructor is removed before segmenting the skb but the socket reference is kept as-is. This is an issue if the original skb is later orphaned as we can hit the following bug: kernel BUG at ./include/linux/skbuff.h:3312! (skb_orphan) RIP: 0010:ip_rcv_core+0x8b2/0xca0 Call Trace: ip_rcv+0xab/0x6e0 __netif_receive_skb_one_core+0x168/0x1b0 process_backlog+0x384/0x1100 __napi_poll.constprop.0+0xa1/0x370 net_rx_action+0x925/0xe50 The above can happen following a sequence of events when using OpenVSwitch, when an OVS_ACTION_ATTR_USERSPACE action precedes an OVS_ACTION_ATTR_OUTPUT action: 1. OVS_ACTION_ATTR_USERSPACE is handled (in do_execute_actions): the skb goes through queue_gso_packets and then __udp_gso_segment, where its destructor is removed. 2. The segments' data are copied and sent to userspace. 3. OVS_ACTION_ATTR_OUTPUT is handled (in do_execute_actions) and the same original skb is sent to its path. 4. If it later hits skb_orphan, we hit the bug. Fix this by also removing the reference to the socket in __udp_gso_segment.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ad405857b174ed31a97982bb129c320d03321cf5 , < 9f28205ddb76e86cac418332e952241d85fed0dc (git)
Affected: ad405857b174ed31a97982bb129c320d03321cf5 , < a2d1cca955ed34873e524cc2e6e885450d262f05 (git)
Affected: ad405857b174ed31a97982bb129c320d03321cf5 , < 455217ac9db0cf9349b3933664355e907bb1a569 (git)
Affected: ad405857b174ed31a97982bb129c320d03321cf5 , < e8db70537878e1bb3fd83e5abcc6feefc0587828 (git)
Affected: ad405857b174ed31a97982bb129c320d03321cf5 , < 01a83237644d6822bc7df2c5564fc81b0df84358 (git)
Affected: ad405857b174ed31a97982bb129c320d03321cf5 , < 084819b0d8b1bd433b90142371eb9450d657f8ca (git)
Affected: ad405857b174ed31a97982bb129c320d03321cf5 , < c32da44cc9298eaa6109e3fc2c2b4e07cc4bf11b (git)
Affected: ad405857b174ed31a97982bb129c320d03321cf5 , < ee01b2f2d7d0010787c2343463965bbc283a497f (git)
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Linux Linux Affected: 4.18
Unaffected: 0 , < 4.18 (semver)
Unaffected: 5.4.291 , ≤ 5.4.* (semver)
Unaffected: 5.10.235 , ≤ 5.10.* (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.131 , ≤ 6.1.* (semver)
Unaffected: 6.6.83 , ≤ 6.6.* (semver)
Unaffected: 6.12.19 , ≤ 6.12.* (semver)
Unaffected: 6.13.7 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
Create a notification for this product.
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(skb_orphan)\\n  RIP: 0010:ip_rcv_core+0x8b2/0xca0\\n  Call Trace:\\n   ip_rcv+0xab/0x6e0\\n   __netif_receive_skb_one_core+0x168/0x1b0\\n   process_backlog+0x384/0x1100\\n   __napi_poll.constprop.0+0xa1/0x370\\n   net_rx_action+0x925/0xe50\\n\\nThe above can happen following a sequence of events when using\\nOpenVSwitch, when an OVS_ACTION_ATTR_USERSPACE action precedes an\\nOVS_ACTION_ATTR_OUTPUT action:\\n\\n1. OVS_ACTION_ATTR_USERSPACE is handled (in do_execute_actions): the skb\\n   goes through queue_gso_packets and then __udp_gso_segment, where its\\n   destructor is removed.\\n2. The segments\u0027 data are copied and sent to userspace.\\n3. OVS_ACTION_ATTR_OUTPUT is handled (in do_execute_actions) and the\\n   same original skb is sent to its path.\\n4. If it later hits skb_orphan, we hit the bug.\\n\\nFix this by also removing the reference to the socket in\\n__udp_gso_segment.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: gso: correcci\u00f3n de propiedad en __udp_gso_segment. En __udp_gso_segment, el destructor de skb se elimina antes de segmentar el skb, pero la referencia del socket se mantiene intacta. Esto supone un problema si el skb original queda hu\u00e9rfano posteriormente, ya que podemos encontrarnos con el siguiente error: \u00a1ERROR del kernel en ./include/linux/skbuff.h:3312! (skb_orphan) RIP: 0010:ip_rcv_core+0x8b2/0xca0 Rastreo de llamadas: ip_rcv+0xab/0x6e0 __netif_receive_skb_one_core+0x168/0x1b0 process_backlog+0x384/0x1100 __napi_poll.constprop.0+0xa1/0x370 net_rx_action+0x925/0xe50 Lo anterior puede suceder despu\u00e9s de una secuencia de eventos al usar OpenVSwitch, cuando una acci\u00f3n OVS_ACTION_ATTR_USERSPACE precede a una acci\u00f3n OVS_ACTION_ATTR_OUTPUT: 1. Se maneja OVS_ACTION_ATTR_USERSPACE (en do_execute_actions): el skb pasa por queue_gso_packets y luego __udp_gso_segment, donde se elimina su destructor. 2. Los datos de los segmentos se copian y se env\u00edan al espacio de usuario. 3. Se gestiona OVS_ACTION_ATTR_OUTPUT (en do_execute_actions) y se env\u00eda el mismo skb original a su ruta. 4. Si posteriormente se encuentra con skb_orphan, se detecta el error. Para solucionarlo, elimine tambi\u00e9n la referencia al socket en __udp_gso_segment.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv4/udp_offload.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ad405857b174ed31a97982bb129c320d03321cf5\",\"lessThan\":\"9f28205ddb76e86cac418332e952241d85fed0dc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ad405857b174ed31a97982bb129c320d03321cf5\",\"lessThan\":\"a2d1cca955ed34873e524cc2e6e885450d262f05\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ad405857b174ed31a97982bb129c320d03321cf5\",\"lessThan\":\"455217ac9db0cf9349b3933664355e907bb1a569\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ad405857b174ed31a97982bb129c320d03321cf5\",\"lessThan\":\"e8db70537878e1bb3fd83e5abcc6feefc0587828\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ad405857b174ed31a97982bb129c320d03321cf5\",\"lessThan\":\"01a83237644d6822bc7df2c5564fc81b0df84358\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ad405857b174ed31a97982bb129c320d03321cf5\",\"lessThan\":\"084819b0d8b1bd433b90142371eb9450d657f8ca\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ad405857b174ed31a97982bb129c320d03321cf5\",\"lessThan\":\"c32da44cc9298eaa6109e3fc2c2b4e07cc4bf11b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ad405857b174ed31a97982bb129c320d03321cf5\",\"lessThan\":\"ee01b2f2d7d0010787c2343463965bbc283a497f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv4/udp_offload.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.291\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.235\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.179\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.131\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.83\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.19\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.13.7\",\"lessThanOrEqual\":\"6.13.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.14\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"SIMATIC 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MFP\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"V3.1.6\",\"lessThan\":\"*\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"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\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.18\",\"versionEndExcluding\":\"5.4.291\",\"matchCriteriaId\":\"98F3786F-2247-4DCB-90A4-4E75412675AD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.235\",\"matchCriteriaId\":\"545121FA-DE31-4154-9446-C2000FB4104D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.179\",\"matchCriteriaId\":\"C708062C-4E1B-465F-AE6D-C09C46400875\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.131\",\"matchCriteriaId\":\"BA9C2DE3-D37C-46C6-8DCD-2EE509456E0B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.83\",\"matchCriteriaId\":\"7D9F642F-6E05-4926-B0FE-62F95B7266BC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.19\",\"matchCriteriaId\":\"32865E5C-8AE1-4D3D-A64D-299039694A88\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.13.7\",\"matchCriteriaId\":\"842F5A44-3E71-4546-B4FD-43B0ACE3F32B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"186716B6-2B66-4BD0-852E-D48E71C0C85F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"0D3E781C-403A-498F-9DA9-ECEE50F41E75\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"66619FB8-0AAF-4166-B2CF-67B24143261D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"D3D6550E-6679-4560-902D-AF52DCFE905B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"45B90F6B-BEC7-4D4E-883A-9DBADE021750\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/01a83237644d6822bc7df2c5564fc81b0df84358\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/084819b0d8b1bd433b90142371eb9450d657f8ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/455217ac9db0cf9349b3933664355e907bb1a569\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9f28205ddb76e86cac418332e952241d85fed0dc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a2d1cca955ed34873e524cc2e6e885450d262f05\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c32da44cc9298eaa6109e3fc2c2b4e07cc4bf11b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e8db70537878e1bb3fd83e5abcc6feefc0587828\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ee01b2f2d7d0010787c2343463965bbc283a497f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-019113.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T09:38:21+00:00",
      "cve": "CVE-2025-21926",
      "id": "CVE-2025-21926",
      "initial_release_date": "2025-04-01T00:00:00+00:00",
      "product_status:fixed": "612",
      "product_status:known_affected": "98",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: gso: fix ownership in __udp_gso_segment",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-21926.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-03T03:53:12Z",
      "cve": "CVE-2025-21926",
      "id": "CVE-2025-21926",
      "initial_release_date": "2025-04-04T02:59:11Z",
      "product_status:known_affected": "624",
      "product_status:known_not_affected": "52",
      "product_status:recommended": "437",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-21926",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-21926.json",
      "version": "40"
    }
  }
}



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Taxonomy of the tags.





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.