{"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":"2026-09-29T12:17:53.380Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-29T12:17:53.380Z"},"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":"ded37d03440d0ab346a8287cc2ba88b8dc90ceb0","lessThan":"ae8512e93f4ce47614ca89defaec1b93e00697b8","status":"affected","versionType":"git"},{"version":"2323690eb05865a657709f4d28eb9538ea97bfc2","lessThan":"1504108cb6020df7b1a31c9bb80fd587470aa448","status":"affected","versionType":"git"},{"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":"b34c668a867ffdcf8bd8db4a36512572e82b4a15","status":"affected","versionType":"git"},{"version":"5.4.137","lessThan":"5.4.289","status":"affected","versionType":"semver"},{"version":"5.10.55","lessThan":"5.10.233","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":"5.4.289","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.233","lessThanOrEqual":"5.10.*","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":"5.4.137","versionEndExcluding":"5.4.289"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.55","versionEndExcluding":"5.10.233"},{"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":"5.13.7"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/ae8512e93f4ce47614ca89defaec1b93e00697b8"},{"url":"https://git.kernel.org/stable/c/1504108cb6020df7b1a31c9bb80fd587470aa448"},{"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"}}]}}