{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-41081", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-41081" ], "published": "2024-07-29T15:04:35Z", "summary": "ila: block BH in ila_output()", "details": "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().", "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", 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"assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.42" }, "1:6.6.28-1+rpt1": { "linux_commit": "0c341f47adc3578cd5f817aa20ee2b7f9ae6b23e", "upstream_version": "6.6.28", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.42" }, "1:6.6.31-1+rpt1": { "linux_commit": "c1432b4bae5b6582f4d32ba381459f33c34d1424", "upstream_version": "6.6.31", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.42" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-41081" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/7435bd2f84a25aba607030237261b3795ba782da" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/96103371091c6476eb07f4c66624bdd1b42f758a" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/a0cafb7b0b94d18e4813ee4b712a056f280e7b5a" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/feac2391e26b086f73be30e9b1ab215eada8d830" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/b4eb25a3d70df925a9fa4e82d17a958a0a228f5f" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/522c3336c2025818fa05e9daf0ac35711e55e316" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/9f9c79d8e527d867e0875868b14fb76e6011e70c" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/cf28ff8e4c02e1ffa850755288ac954b6ff0db8c" } ], "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 - On a host with an ILA lwtunnel route configured, `ila_output()` is reached directly from packet processing \u2014 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 \u2014 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 \u2014 `dst_output()` invokes `dst->output()` and `dst->ops` callbacks \u2014 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." } } }