CVE-2024-44986

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"HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - `ip6_finish_output2()` is the core IPv6 transmit path, driven by remote traffic \u2014 forwarded packets, TCP/ICMPv6 responses generated for received datagrams, in-kernel server replies (nfsd/ksmbd over IPv6), and TEE/dup mirroring of received frames \u2014 so a remote unauthenticated peer can keep the vulnerable code executing continuously without any local access.\nAC:H - Exploitation requires a GFP_ATOMIC allocation failure inside `skb_expand_head()`, coinciding with the skb holding the last `dst` reference whose `rt6i_idev` is in turn the last `inet6_dev` reference (i.e. a concurrent `addrconf_ifdown`/netdev teardown), and an RCU grace period completing in the handful of instructions between `kfree_skb()` and `IP6_INC_STATS()` \u2014 conditions the attacker can influence only statistically, not command.\nPR:N - No credential, capability, or authentication check exists anywhere on the output path; the packet that drives `ip6_finish_output2()` is forwarded or generated in response to unauthenticated remote traffic.\nUI:N - The transmit path executes automatically on packet forwarding or response generation; no local user must open, mount, or otherwise interact with anything.\nS:U - The freed `inet6_dev` and its per-CPU SNMP array are kernel objects in the same security authority as the code that touches them; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The `_DEVINC` macro reads `idev->stats.ipv6` out of a freed slab object, and per kernel UAF convention a stale read of a reclaimable heap object that the attacker can groom with concurrent traffic constitutes a high-confidentiality read primitive.\nI:H - After the stale pointer is read, `SNMP_INC_STATS64()` performs a `this_cpu_inc()` through it \u2014 if the `inet6_dev` slab object has been reclaimed with attacker-sprayed data this becomes a controlled increment at a chosen kernel address, a classic write primitive escalatable to control-flow hijacking; the freed per-CPU MIB is also written.\nA:H - The use-after-free write into freed slab/per-CPU memory panics KASAN and `panic_on_warn` kernels outright, and on stock kernels corrupts whatever allocation reclaimed the `inet6_dev`, causing an oops in the IPv6 transmit path."}]}], "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": "ded37d03440d0ab346a8287cc2ba88b8dc90ceb0", "lessThan": "ae8512e93f4ce47614ca89defaec1b93e00697b8", "status": "affected", "versionType": "git"}, {"version": "2323690eb05865a657709f4d28eb9538ea97bfc2", "lessThan": "1504108cb6020df7b1a31c9bb80fd587470aa448", "status": "affected", "versionType": "git"}, {"version": "5796015fa968a3349027a27dcd04c71d95c53ba5", "lessThan": "e891b36de161fcd96f12ff83667473e5067b9037", "status": "affected", "versionType": "git"}, {"version": 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"en", "value": "AV:N - `ip6_finish_output2()` is the core IPv6 transmit path, driven by remote traffic \u2014 forwarded packets, TCP/ICMPv6 responses generated for received datagrams, in-kernel server replies (nfsd/ksmbd over IPv6), and TEE/dup mirroring of received frames \u2014 so a remote unauthenticated peer can keep the vulnerable code executing continuously without any local access.\nAC:H - Exploitation requires a GFP_ATOMIC allocation failure inside `skb_expand_head()`, coinciding with the skb holding the last `dst` reference whose `rt6i_idev` is in turn the last `inet6_dev` reference (i.e. a concurrent `addrconf_ifdown`/netdev teardown), and an RCU grace period completing in the handful of instructions between `kfree_skb()` and `IP6_INC_STATS()` \u2014 conditions the attacker can influence only statistically, not command.\nPR:N - No credential, capability, or authentication check exists anywhere on the output path; the packet that drives `ip6_finish_output2()` is forwarded or generated in response to unauthenticated remote traffic.\nUI:N - The transmit path executes automatically on packet forwarding or response generation; no local user must open, mount, or otherwise interact with anything.\nS:U - The freed `inet6_dev` and its per-CPU SNMP array are kernel objects in the same security authority as the code that touches them; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The `_DEVINC` macro reads `idev->stats.ipv6` out of a freed slab object, and per kernel UAF convention a stale read of a reclaimable heap object that the attacker can groom with concurrent traffic constitutes a high-confidentiality read primitive.\nI:H - After the stale pointer is read, `SNMP_INC_STATS64()` performs a `this_cpu_inc()` through it \u2014 if the `inet6_dev` slab object has been reclaimed with attacker-sprayed data this becomes a controlled increment at a chosen kernel address, a classic write primitive escalatable to control-flow hijacking; the freed per-CPU MIB is also 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"versionEndExcluding": "6.6.48", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D2AFDFD1-D95A-4EB7-843B-5E7659518B67", "versionEndExcluding": "6.10.7", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*", "matchCriteriaId": "8B3CE743-2126-47A3-8B7C-822B502CF119", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*", "matchCriteriaId": "4DEB27E7-30AA-45CC-8934-B89263EF3551", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:*", "matchCriteriaId": "E0005AEF-856E-47EB-BFE4-90C46899394D", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc4:*:*:*:*:*:*", "matchCriteriaId": "39889A68-6D34-47A6-82FC-CD0BF23D6754", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix possible UAF in ip6_finish_output2()\n\nIf skb_expand_head() returns NULL, skb has been freed\nand associated dst/idev could also have been freed.\n\nWe need to hold rcu_read_lock() to make sure the dst and\nassociated idev are alive."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ipv6: se ha corregido un posible UAF en ip6_finish_output2() Si skb_expand_head() devuelve NULL, se ha liberado skb y tambi\u00e9n se podr\u00eda haber liberado el dst/idev asociado. Necesitamos mantener rcu_read_lock() para asegurarnos de que el dst y el idev asociado est\u00e9n activos."}], "id": "CVE-2024-44986", "lastModified": "2026-09-29T13:17:38.417", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-44986", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-04T20:20:05.005399Z", "version": "2.0.3"}}]}, "published": "2024-09-04T20:15:07.833", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1504108cb6020df7b1a31c9bb80fd587470aa448"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3574d28caf9a09756ae87ad1ea096c6f47b6101e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/56efc253196751ece1fc535a5b582be127b0578a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6ab6bf731354a6fdbaa617d1ec194960db61cf3b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ae8512e93f4ce47614ca89defaec1b93e00697b8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/da273b377ae0d9bd255281ed3c2adb228321687b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e891b36de161fcd96f12ff83667473e5067b9037"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ipv6: fix possible UAF in ip6_finish_output2()", "id": "2309849", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2309849"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nipv6: fix possible UAF in ip6_finish_output2()\nIf skb_expand_head() returns NULL, skb has been freed\nand associated dst/idev could also have been freed.\nWe need to hold rcu_read_lock() to make sure the dst and\nassociated idev are alive."], "name": "CVE-2024-44986", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-09-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-44986\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-44986\nhttps://lore.kernel.org/linux-cve-announce/2024090445-CVE-2024-44986-1197@gregkh/T"], "threat_severity": "Moderate"}

{}