{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-41081", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-07-12T12:17:45.633Z", "datePublished": "2024-07-29T15:04:18.459Z", "dateUpdated": "2026-08-05T11:35:15.378Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:35:15.378Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nila: block BH in ila_output()\n\nAs explained in commit 1378817486d6 (\"tipc: block BH\nbefore using dst_cache\"), net/core/dst_cache.c\nhelpers need to be called with BH disabled.\n\nila_output() is called from lwtunnel_output()\npossibly from process context, and under rcu_read_lock().\n\nWe might be interrupted by a softirq, re-enter ila_output()\nand corrupt dst_cache data structures.\n\nFix the race by using local_bh_disable()." } ], "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 - On a host with an ILA lwtunnel route configured, `ila_output()` is reached directly from packet processing — forwarded/routed packets execute it in NET_RX/NET_TX softirq context while locally-originated traffic (including replies a remote peer induces from a server on the host) executes it in process context, so a remote unauthenticated attacker sending IPv6 traffic drives the vulnerable code path.\nAC:L - The attacker drives both sides of the race by controlling traffic rate on the softirq path and the process-context path, and can flood to make the softirq land inside the unprotected `dst_cache` update window; per-CPU state can be targeted by sustained load, so no condition outside the attacker's influence is required.\nPR:N - No credentials or authentication are needed — merely emitting IPv6 packets that traverse the configured ILA route reaches `ila_output()`. The equivalent local path is likewise available to an unprivileged user (netns + traffic generation), so no elevated privilege is required under any reading.\nUI:N - Triggering requires only attacker-generated network traffic against an already-configured ILA route; no administrator or victim action is needed at exploit time.\nS:U - The corruption and its consequences are confined to the kernel's own memory and security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The race produces a use-after-free on `struct dst_entry` (stale per-CPU pointer taken and reused, or refcount underflow leading to premature free); a reclaimed and attacker-sprayed dst object can be leveraged to read arbitrary kernel memory.\nI:H - The freed `dst_entry` is immediately used for routing — `dst_output()` invokes `dst->output()` and `dst->ops` callbacks — so controlling the reclaimed object yields function-pointer hijack and arbitrary write, i.e. full kernel integrity loss.\nA:H - Even unexploited, the refcount corruption and use of a freed dst reliably cause oops/panic in the network output path, and the race can be retriggered continuously for repeated system crashes." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv6/ila/ila_lwt.c" ], "versions": [ { "version": "79ff2fc31e0f6a52eeb67fb89fba87e822b9b7b5", "lessThan": "7435bd2f84a25aba607030237261b3795ba782da", "status": "affected", "versionType": "git" }, { "version": "79ff2fc31e0f6a52eeb67fb89fba87e822b9b7b5", "lessThan": "96103371091c6476eb07f4c66624bdd1b42f758a", "status": "affected", "versionType": "git" }, { "version": "79ff2fc31e0f6a52eeb67fb89fba87e822b9b7b5", "lessThan": "a0cafb7b0b94d18e4813ee4b712a056f280e7b5a", "status": "affected", "versionType": "git" }, { "version": "79ff2fc31e0f6a52eeb67fb89fba87e822b9b7b5", "lessThan": "feac2391e26b086f73be30e9b1ab215eada8d830", "status": "affected", "versionType": "git" }, { "version": "79ff2fc31e0f6a52eeb67fb89fba87e822b9b7b5", "lessThan": "b4eb25a3d70df925a9fa4e82d17a958a0a228f5f", "status": "affected", "versionType": "git" }, { "version": "79ff2fc31e0f6a52eeb67fb89fba87e822b9b7b5", "lessThan": "522c3336c2025818fa05e9daf0ac35711e55e316", "status": "affected", "versionType": "git" }, { "version": "79ff2fc31e0f6a52eeb67fb89fba87e822b9b7b5", "lessThan": "9f9c79d8e527d867e0875868b14fb76e6011e70c", "status": "affected", "versionType": "git" }, { "version": "79ff2fc31e0f6a52eeb67fb89fba87e822b9b7b5", "lessThan": "cf28ff8e4c02e1ffa850755288ac954b6ff0db8c", "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/ila/ila_lwt.c" ], "versions": [ { "version": "4.10", "status": "affected" }, { "version": "0", "lessThan": "4.10", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.319", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.281", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.223", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.164", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.101", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.42", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.11", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ 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