{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-44986", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-21T05:34:56.671Z", "datePublished": "2024-09-04T19:54:34.852Z", "dateUpdated": "2026-08-05T11:37:28.752Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:37:28.752Z" }, "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - `ip6_finish_output2()` is the core IPv6 transmit path, driven by remote traffic — forwarded packets, TCP/ICMPv6 responses generated for received datagrams, in-kernel server replies (nfsd/ksmbd over IPv6), and TEE/dup mirroring of received frames — 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()` — 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 — 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": "5796015fa968a3349027a27dcd04c71d95c53ba5", "lessThan": "e891b36de161fcd96f12ff83667473e5067b9037", "status": "affected", "versionType": "git" }, { "version": "5796015fa968a3349027a27dcd04c71d95c53ba5", "lessThan": "3574d28caf9a09756ae87ad1ea096c6f47b6101e", "status": "affected", "versionType": "git" }, { "version": "5796015fa968a3349027a27dcd04c71d95c53ba5", "lessThan": "6ab6bf731354a6fdbaa617d1ec194960db61cf3b", "status": "affected", "versionType": "git" }, { "version": "5796015fa968a3349027a27dcd04c71d95c53ba5", "lessThan": "56efc253196751ece1fc535a5b582be127b0578a", "status": "affected", "versionType": "git" }, { "version": "5796015fa968a3349027a27dcd04c71d95c53ba5", "lessThan": "da273b377ae0d9bd255281ed3c2adb228321687b", "status": "affected", "versionType": "git" }, { "version": "ded37d03440d0ab346a8287cc2ba88b8dc90ceb0", "status": "affected", "versionType": "git" }, { "version": "2323690eb05865a657709f4d28eb9538ea97bfc2", "status": "affected", "versionType": "git" }, { "version": "b34c668a867ffdcf8bd8db4a36512572e82b4a15", "status": "affected", "versionType": "git" }, { "version": "5.4.137", "lessThan": "5.5", "status": "affected", "versionType": "semver" }, { "version": "5.10.55", "lessThan": "5.11", "status": "affected", "versionType": "semver" }, { "version": "5.13.7", "lessThan": "5.14", "status": "affected", "versionType": "semver" } ] }, { "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": "5.14", "status": "affected" }, { "version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.166", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.107", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.48", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10.7", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11", "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": "5.14", "versionEndExcluding": "5.15.166" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.1.107" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.6.48" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.10.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.137" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.55" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13.7" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e891b36de161fcd96f12ff83667473e5067b9037" }, { "url": "https://git.kernel.org/stable/c/3574d28caf9a09756ae87ad1ea096c6f47b6101e" }, { "url": "https://git.kernel.org/stable/c/6ab6bf731354a6fdbaa617d1ec194960db61cf3b" }, { "url": "https://git.kernel.org/stable/c/56efc253196751ece1fc535a5b582be127b0578a" }, { "url": "https://git.kernel.org/stable/c/da273b377ae0d9bd255281ed3c2adb228321687b" } ], "title": "ipv6: fix possible UAF in ip6_finish_output2()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-09-04T20:20:05.005399Z", "id": "CVE-2024-44986", "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": "2024-09-04T20:21:13.628Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:14:34.580Z" } } ] } }