CVE-2025-40158

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(Even in the purely local framing the netns/CAP_NET_ADMIN half is obtainable via `unshare -Urn`, so no real privilege is required either way.)\nUI:N - Transmission and forwarding happen unconditionally in softirq/process context on packet arrival; no administrator or local user has to open, mount, or click anything.\nS:U - The freed `inet6_dev` and `net_device` are kernel objects and the corruption stays within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free read of `idev->cnf.disable_ipv6`, `idev->stats.ipv6`, `dev->hard_header_len`/`needed_headroom`, `dev->header_ops` and `dev->flags`; once the freed slab object is reallocated the attacker can steer header-expansion sizes and the egress device, yielding kernel memory disclosure and out-of-device packet leakage.\nI:H - `IP6_INC_STATS`/`IP6_UPD_PO_STATS` expand to `SNMP_INC_STATS64(idev->stats.ipv6, field)`, performing a 64-bit increment through a per-CPU pointer loaded from freed memory \u2014 an arbitrary-write primitive after reallocation \u2014 and `neigh_output()` \u2192 `dev_queue_xmit()` makes an indirect call through `dev->netdev_ops->ndo_start_xmit` read from the freed `net_device`, giving control-flow hijack.\nA:H - Dereferencing a freed `inet6_dev`/`net_device` on the packet transmit path reliably oopses or panics the kernel (KASAN slab-use-after-free), and the crash is in the core IPv6 output path so it takes down the whole forwarding host."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/ip6_output.c"], "versions": [{"version": "4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36", "lessThan": "4549ce1057363c8dc072f40c6aa591c279eafed2", "status": "affected", "versionType": "git"}, {"version": "4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36", "lessThan": "423895685f367b5a0a956bd14b02df0192bded4c", "status": "affected", "versionType": "git"}, {"version": "4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36", "lessThan": "92803b826e40e49a5e8a6e208f4b4574e9d19426", "status": "affected", "versionType": "git"}, {"version": "4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36", "lessThan": "0393f85c3241c19ba8550f04a812e7d19f6b3082", "status": "affected", "versionType": "git"}, {"version": "4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36", "lessThan": "11709573cc4e48dc34c80fc7ab9ce5b159e29695", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/ip6_output.c"], "versions": [{"version": "4.13", "status": "affected"}, {"version": "0", "lessThan": "4.13", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.113", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17.3", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18", "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": "4.13", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "6.12.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "6.17.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "6.18"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4549ce1057363c8dc072f40c6aa591c279eafed2"}, {"url": "https://git.kernel.org/stable/c/423895685f367b5a0a956bd14b02df0192bded4c"}, {"url": "https://git.kernel.org/stable/c/92803b826e40e49a5e8a6e208f4b4574e9d19426"}, {"url": "https://git.kernel.org/stable/c/0393f85c3241c19ba8550f04a812e7d19f6b3082"}, {"url": "https://git.kernel.org/stable/c/11709573cc4e48dc34c80fc7ab9ce5b159e29695"}], "title": "ipv6: use RCU in ip6_output()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-16T20:00:29.008533Z", "id": "CVE-2025-40158", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-16T20:00:37.150Z"}}]}}

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(Even in the purely local framing the netns/CAP_NET_ADMIN half is obtainable via `unshare -Urn`, so no real privilege is required either way.)\nUI:N - Transmission and forwarding happen unconditionally in softirq/process context on packet arrival; no administrator or local user has to open, mount, or click anything.\nS:U - The freed `inet6_dev` and `net_device` are kernel objects and the corruption stays within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free read of `idev->cnf.disable_ipv6`, `idev->stats.ipv6`, `dev->hard_header_len`/`needed_headroom`, `dev->header_ops` and `dev->flags`; once the freed slab object is reallocated the attacker can steer header-expansion sizes and the egress device, yielding kernel memory disclosure and out-of-device packet leakage.\nI:H - `IP6_INC_STATS`/`IP6_UPD_PO_STATS` expand to `SNMP_INC_STATS64(idev->stats.ipv6, field)`, performing a 64-bit increment through a per-CPU pointer loaded from freed memory \u2014 an arbitrary-write primitive after reallocation \u2014 and `neigh_output()` \u2192 `dev_queue_xmit()` makes an indirect call through `dev->netdev_ops->ndo_start_xmit` read from the freed `net_device`, giving control-flow hijack.\nA:H - Dereferencing a freed `inet6_dev`/`net_device` on the packet transmit path reliably oopses or panics the kernel (KASAN slab-use-after-free), and the crash is in the core IPv6 output path so it takes down the whole forwarding host."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36", "lessThan": "4549ce1057363c8dc072f40c6aa591c279eafed2", "versionType": "git"}, {"status": "affected", "version": "4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36", "lessThan": "423895685f367b5a0a956bd14b02df0192bded4c", "versionType": "git"}, {"status": "affected", "version": "4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36", "lessThan": "92803b826e40e49a5e8a6e208f4b4574e9d19426", "versionType": "git"}, {"status": "affected", "version": "4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36", "lessThan": "0393f85c3241c19ba8550f04a812e7d19f6b3082", "versionType": "git"}, {"status": "affected", "version": "4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36", "lessThan": "11709573cc4e48dc34c80fc7ab9ce5b159e29695", "versionType": "git"}], "programFiles": ["net/ipv6/ip6_output.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.13"}, {"status": "unaffected", "version": "0", "lessThan": "4.13", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.191", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.160", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.113", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.17.3", "versionType": "semver", "lessThanOrEqual": "6.17.*"}, {"status": "unaffected", "version": "6.18", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/ipv6/ip6_output.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/4549ce1057363c8dc072f40c6aa591c279eafed2"}, {"url": "https://git.kernel.org/stable/c/423895685f367b5a0a956bd14b02df0192bded4c"}, {"url": "https://git.kernel.org/stable/c/92803b826e40e49a5e8a6e208f4b4574e9d19426"}, {"url": "https://git.kernel.org/stable/c/0393f85c3241c19ba8550f04a812e7d19f6b3082"}, {"url": "https://git.kernel.org/stable/c/11709573cc4e48dc34c80fc7ab9ce5b159e29695"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: use RCU in ip6_output()\n\nUse RCU in ip6_output() in order to use dst_dev_rcu() to prevent\npossible UAF.\n\nWe can remove rcu_read_lock()/rcu_read_unlock() pairs\nfrom ip6_finish_output2()."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.191", "versionStartIncluding": "4.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.160", "versionStartIncluding": "4.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.113", "versionStartIncluding": "4.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.17.3", "versionStartIncluding": "4.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18", "versionStartIncluding": "4.13"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:22:53.554Z"}}}, "cveMetadata": {"cveId": "CVE-2025-40158", "state": "PUBLISHED", "dateUpdated": "2026-10-30T12:22:53.554Z", "dateReserved": "2025-04-16T07:20:57.176Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-11-12T10:23:29.516Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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{"bugzilla": {"description": "kernel: ipv6: use RCU in ip6_output()", "id": "2414523", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2414523"}, "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"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nipv6: use RCU in ip6_output()\nUse RCU in ip6_output() in order to use dst_dev_rcu() to prevent\npossible UAF.\nWe can remove rcu_read_lock()/rcu_read_unlock() pairs\nfrom ip6_finish_output2()."], "name": "CVE-2025-40158", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-11-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40158\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40158\nhttps://lore.kernel.org/linux-cve-announce/2025111258-CVE-2025-40158-4c9d@gregkh/T"], "threat_severity": "Important"}

{"created": "2025-11-12T22:12:35.077188+00:00", "updated": "2025-11-12T22:12:35.077217+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}