CVE-2026-63919

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Use maybe_get_net() so the queueing\npath does not revive a namespace that is already being torn down.\n\nThis keeps the existing workqueue design and fixes the netns lifetime\nhandling in one place for all users of xfrm_trans_queue_net()."}], "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 vulnerable path is reached when IPsec ESP/AH packets are received and processed through xfrm_input transport-mode reinjection, which is a network packet receive path in net/xfrm. Remote peers can send ESP traffic to trigger deferred queueing on systems with IPsec configured.\nAC:L - The attacker controls both sides of the race by flooding IPsec packets to queue deferred reinjection work while concurrently destroying the network namespace, making the UAF reliably triggerable without conditions outside attacker control.\nPR:L - Exploitation requires configuring xfrm/IPsec and managing network namespace lifecycle, both reachable with CAP_NET_ADMIN obtainable by an unprivileged user via user namespaces (unshare -Urn), not requiring real root in the init namespace.\nUI:N - No victim user interaction is required; exploitation is achieved through automated packet transmission and namespace teardown scripted by the attacker.\nS:U - Impact is kernel memory corruption and potential privilege escalation within the same security authority; this is not a VM escape or cross-authority boundary bypass.\nC:H - The deferred callback dereferences a freed struct net (e.g., ip6_rcv_finish_core reads sysctl fields from the UAF pointer), providing an information disclosure primitive from attacker-influenced freed slab memory.\nI:H - Use-after-free on the large struct net slab object enables heap grooming and memory corruption exploitable for arbitrary kernel writes and control-flow hijacking, not merely a bounded modification.\nA:H - Dereferencing a freed network namespace structure causes kernel oops/panic from the workqueue callback path, and UAF reliably threatens system availability even when full exploitation is not attempted."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/xfrm/xfrm_input.c"], "versions": [{"version": "7b3801927e52f8621de311277f7fc727635019e7", "lessThan": "7ee59eda8820b758ed29e1cd3222359c7b97302c", "status": "affected", "versionType": "git"}, {"version": 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{"url": "https://git.kernel.org/stable/c/9f7ebb45a83afc3216e855e57d51bb4bc9b5232e"}, {"url": "https://git.kernel.org/stable/c/9f67a36e91bb50d358760f381f233913fe5c09f8"}, {"url": "https://git.kernel.org/stable/c/c16f74dc1d75d0e2e7670076d5375deda110ebeb"}], "title": "xfrm: input: hold netns during deferred transport reinjection", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-63919", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:33:20.958476Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:17:56.102Z"}}]}}

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Remote peers can send ESP traffic to trigger deferred queueing on systems with IPsec configured.\nAC:L - The attacker controls both sides of the race by flooding IPsec packets to queue deferred reinjection work while concurrently destroying the network namespace, making the UAF reliably triggerable without conditions outside attacker control.\nPR:L - Exploitation requires configuring xfrm/IPsec and managing network namespace lifecycle, both reachable with CAP_NET_ADMIN obtainable by an unprivileged user via user namespaces (unshare -Urn), not requiring real root in the init namespace.\nUI:N - No victim user interaction is required; exploitation is achieved through automated packet transmission and namespace teardown scripted by the attacker.\nS:U - Impact is kernel memory corruption and potential privilege escalation within the same security authority; this is not a VM escape or cross-authority boundary bypass.\nC:H - The deferred callback dereferences a freed struct net (e.g., ip6_rcv_finish_core reads sysctl fields from the UAF pointer), providing an information disclosure primitive from attacker-influenced freed slab memory.\nI:H - Use-after-free on the large struct net slab object enables heap grooming and memory corruption exploitable for arbitrary kernel writes and control-flow hijacking, not merely a bounded modification.\nA:H - Dereferencing a freed network namespace structure causes kernel oops/panic from the workqueue callback path, and UAF reliably threatens system availability even when full exploitation is not attempted."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "7b3801927e52f8621de311277f7fc727635019e7", "lessThan": "7ee59eda8820b758ed29e1cd3222359c7b97302c", "versionType": "git"}, {"status": "affected", "version": "7b3801927e52f8621de311277f7fc727635019e7", "lessThan": "2df7059a18afb7d3aee6c36cad5d371c198111d4", "versionType": "git"}, {"status": "affected", "version": "7b3801927e52f8621de311277f7fc727635019e7", "lessThan": "8dfabcba6a943a7a02ebe1e1637c361ba96acbaa", "versionType": "git"}, {"status": "affected", "version": "7b3801927e52f8621de311277f7fc727635019e7", "lessThan": "48ce101cd630d6745b6923b5bad8358bc4c119da", "versionType": "git"}, {"status": "affected", "version": "7b3801927e52f8621de311277f7fc727635019e7", "lessThan": "55ddfc41451f01c588089cd74957a05311b6f202", "versionType": "git"}, {"status": "affected", "version": "7b3801927e52f8621de311277f7fc727635019e7", "lessThan": "9f7ebb45a83afc3216e855e57d51bb4bc9b5232e", "versionType": "git"}, {"status": "affected", "version": "7b3801927e52f8621de311277f7fc727635019e7", "lessThan": "9f67a36e91bb50d358760f381f233913fe5c09f8", "versionType": "git"}, {"status": "affected", "version": "7b3801927e52f8621de311277f7fc727635019e7", "lessThan": "c16f74dc1d75d0e2e7670076d5375deda110ebeb", "versionType": "git"}], "programFiles": ["net/xfrm/xfrm_input.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.6"}, {"status": "unaffected", "version": "0", "lessThan": "5.6", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.259", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.210", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.176", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.143", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.93", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.35", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.12", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/xfrm/xfrm_input.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/7ee59eda8820b758ed29e1cd3222359c7b97302c"}, {"url": "https://git.kernel.org/stable/c/2df7059a18afb7d3aee6c36cad5d371c198111d4"}, {"url": "https://git.kernel.org/stable/c/8dfabcba6a943a7a02ebe1e1637c361ba96acbaa"}, {"url": "https://git.kernel.org/stable/c/48ce101cd630d6745b6923b5bad8358bc4c119da"}, {"url": "https://git.kernel.org/stable/c/55ddfc41451f01c588089cd74957a05311b6f202"}, {"url": "https://git.kernel.org/stable/c/9f7ebb45a83afc3216e855e57d51bb4bc9b5232e"}, {"url": "https://git.kernel.org/stable/c/9f67a36e91bb50d358760f381f233913fe5c09f8"}, {"url": "https://git.kernel.org/stable/c/c16f74dc1d75d0e2e7670076d5375deda110ebeb"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: input: hold netns during deferred transport reinjection\n\nTransport-mode reinjection stores a struct net pointer in skb->cb and\nuses it later from xfrm_trans_reinject(). That pointer must stay valid\nuntil the deferred callback runs.\n\nTake a netns reference when queueing deferred reinjection work and drop\nit after the callback completes. Use maybe_get_net() so the queueing\npath does not revive a namespace that is already being torn down.\n\nThis keeps the existing workqueue design and fixes the netns lifetime\nhandling in one place for all users of xfrm_trans_queue_net()."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.259", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.210", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.176", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.143", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.93", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.35", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.12", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "5.6"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:37:13.727Z"}}}, "cveMetadata": {"cveId": "CVE-2026-63919", "state": "PUBLISHED", "dateUpdated": "2026-10-19T20:17:56.102Z", "dateReserved": "2026-07-19T07:54:57.020Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-19T14:55:22.121Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: input: hold netns during deferred transport reinjection\n\nTransport-mode reinjection stores a struct net pointer in skb->cb and\nuses it later from xfrm_trans_reinject(). That pointer must stay valid\nuntil the deferred callback runs.\n\nTake a netns reference when queueing deferred reinjection work and drop\nit after the callback completes. Use maybe_get_net() so the queueing\npath does not revive a namespace that is already being torn down.\n\nThis keeps the existing workqueue design and fixes the netns lifetime\nhandling in one place for all users of xfrm_trans_queue_net()."}], "id": "CVE-2026-63919", "lastModified": "2026-10-27T12:51:04.317", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-63919", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:33:20.958476Z", "version": "2.0.3"}}]}, "published": "2026-07-19T16:17:10.030", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2df7059a18afb7d3aee6c36cad5d371c198111d4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/48ce101cd630d6745b6923b5bad8358bc4c119da"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/55ddfc41451f01c588089cd74957a05311b6f202"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7ee59eda8820b758ed29e1cd3222359c7b97302c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8dfabcba6a943a7a02ebe1e1637c361ba96acbaa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9f67a36e91bb50d358760f381f233913fe5c09f8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9f7ebb45a83afc3216e855e57d51bb4bc9b5232e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c16f74dc1d75d0e2e7670076d5375deda110ebeb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: xfrm: input: hold netns during deferred transport reinjection", "id": "2502412", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502412"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-911", "details": ["A flaw was found in the Linux kernel's xfrm input component. The transport-mode reinjection process, which handles network packet re-injection, stores a network namespace pointer that must remain valid until a deferred callback completes. However, a missing reference count for the network namespace during this deferred operation could lead to a use-after-free vulnerability. This could allow an attacker to potentially cause a system crash or other unpredictable behavior if the network namespace is deallocated prematurely."], "name": "CVE-2026-63919", "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63919\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63919\nhttps://lore.kernel.org/linux-cve-announce/2026071947-CVE-2026-63919-e224@gregkh/T"], "threat_severity": "Moderate"}

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