{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-44985", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-21T05:34:56.670Z", "datePublished": "2024-09-04T19:54:34.188Z", "dateUpdated": "2026-08-05T11:37:27.693Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:37:27.693Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "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 — 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." } ] } ], "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": "81d626b00bdba16504eeae9cc891b18e83a9471a", "lessThan": "b3a3d5333c13a1be57499581eab4a8fc94d57f36", "status": "affected", "versionType": "git" }, { "version": "ee6b1db17f8287b615448488fc37f42bcfe9ece6", "lessThan": "c47e022011719fc5727bca661d662303180535ba", "status": "affected", "versionType": "git" }, { "version": "0c9f227bee11910a49e1d159abe102d06e3745d5", "lessThan": "975f764e96f71616b530e300c1bb2ac0ce0c2596", "status": "affected", "versionType": "git" }, { "version": "0c9f227bee11910a49e1d159abe102d06e3745d5", "lessThan": "38a21c026ed2cc7232414cb166efc1923f34af17", "status": "affected", "versionType": "git" }, { "version": "0c9f227bee11910a49e1d159abe102d06e3745d5", "lessThan": "124b428fe28064c809e4237b0b38e97200a8a4a8", "status": "affected", "versionType": "git" }, { "version": "0c9f227bee11910a49e1d159abe102d06e3745d5", "lessThan": "fc88d6c1f2895a5775795d82ec581afdff7661d1", "status": "affected", "versionType": "git" }, { "version": "0c9f227bee11910a49e1d159abe102d06e3745d5", "lessThan": "2d5ff7e339d04622d8282661df36151906d0e1c7", "status": "affected", "versionType": "git" } ] }, { "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": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "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": "5.15", "versionEndExcluding": "5.15.166" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.107" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.48" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.10.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.11" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/b3a3d5333c13a1be57499581eab4a8fc94d57f36" }, { "url": "https://git.kernel.org/stable/c/c47e022011719fc5727bca661d662303180535ba" }, { "url": "https://git.kernel.org/stable/c/975f764e96f71616b530e300c1bb2ac0ce0c2596" }, { "url": "https://git.kernel.org/stable/c/38a21c026ed2cc7232414cb166efc1923f34af17" }, { "url": "https://git.kernel.org/stable/c/124b428fe28064c809e4237b0b38e97200a8a4a8" }, { "url": "https://git.kernel.org/stable/c/fc88d6c1f2895a5775795d82ec581afdff7661d1" }, { "url": "https://git.kernel.org/stable/c/2d5ff7e339d04622d8282661df36151906d0e1c7" } ], "title": "ipv6: prevent possible UAF in ip6_xmit()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-09-10T01:05:42.699758Z", "id": "CVE-2024-44985", "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": "2024-09-10T01:07:00.575Z" } }, { "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": "2025-11-03T22:14:33.082Z" } } ] } }