{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-44986", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-44986" ], "published": "2024-09-04T19:57:01Z", "summary": "ipv6: fix possible UAF in ip6_finish_output2()", "details": "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.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1", "1:6.6.47-1+rpt1" ], "ecosystem_specific": { "binaries": [ { 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"type": "FIX", "url": "https://git.kernel.org/stable/c/ae8512e93f4ce47614ca89defaec1b93e00697b8" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/1504108cb6020df7b1a31c9bb80fd587470aa448" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/e891b36de161fcd96f12ff83667473e5067b9037" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/3574d28caf9a09756ae87ad1ea096c6f47b6101e" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/6ab6bf731354a6fdbaa617d1ec194960db61cf3b" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/56efc253196751ece1fc535a5b582be127b0578a" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/da273b377ae0d9bd255281ed3c2adb228321687b" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-09-29T12:17:55Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 8.1, "cvss_v3_severity": "High", "scenario": "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." } } }