{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-44985", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-44985" ], "published": "2024-09-04T19:57:01Z", "summary": "ipv6: prevent possible UAF in ip6_xmit()", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: prevent possible UAF in ip6_xmit()\n\nIf skb_expand_head() returns NULL, skb has been freed\nand the associated dst/idev could also have been freed.\n\nWe must use rcu_read_lock() to prevent a possible UAF.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:N/AC:L/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": [ { "binary_name": 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"type": "FIX", "url": "https://git.kernel.org/stable/c/b3a3d5333c13a1be57499581eab4a8fc94d57f36" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/c47e022011719fc5727bca661d662303180535ba" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/975f764e96f71616b530e300c1bb2ac0ce0c2596" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/38a21c026ed2cc7232414cb166efc1923f34af17" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/124b428fe28064c809e4237b0b38e97200a8a4a8" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/fc88d6c1f2895a5775795d82ec581afdff7661d1" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/2d5ff7e339d04622d8282661df36151906d0e1c7" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T11:52:36Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 9.8, "cvss_v3_severity": "Critical", "scenario": "AV:N - The only ip6_xmit() caller lacking a surrounding rcu_read_lock() while holding a refcounted skb dst is tcp_v6_send_response(), driven purely by inbound TCP/IPv6 packets (RST to closed ports via tcp_v6_rcv()'s no_tcp_socket path, TIME_WAIT ACKs, request-sock ACKs). A remote attacker on the internet reaches it with unsolicited TCP segments.\nAC:L - The attacker drives the vulnerable path at unbounded rate with a packet flood, and that same flood produces the GFP_ATOMIC memory pressure that makes skb_expand_head() fail, plus the CPU/scheduling pressure that widens the preemption window in the preemptible backlog-drain context; none of the required conditions lie outside attacker influence.\nPR:N - Generating a TCP RST/ACK reply to a closed or TIME_WAIT IPv6 port requires no credentials, no session, and no prior handshake \u2014 the code path is entirely pre-authentication.\nUI:N - The kernel emits the reply automatically on packet receipt; no local user or administrator action is involved.\nS:U - The freed struct inet6_dev and the resulting corruption are entirely within the kernel's own security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The stale idev deref reads a __percpu pointer out of a freed slab object; controlling that object via heap reclaim converts the subsequent per-CPU MIB access into an attacker-directed kernel read, exposing arbitrary kernel memory.\nI:H - SNMP_INC_STATS64 performs a read-modify-write (u64_stats seqcount update plus counter add) at an address derived from the freed object's contents, yielding a controlled-address kernel write suitable for control-flow hijack once the inet6_dev allocation is groomed.\nA:H - Even unweaponized, dereferencing and incrementing through a freed inet6_dev's percpu pointer corrupts kernel memory and reliably produces an oops or panic, and the path can be re-triggered remotely at will." } } }