{"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":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"4.19.319"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"5.4.281"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"5.10.223"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"5.15.164"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"6.1.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"6.6.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"6.9.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"6.10"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/7435bd2f84a25aba607030237261b3795ba782da"},{"url":"https://git.kernel.org/stable/c/96103371091c6476eb07f4c66624bdd1b42f758a"},{"url":"https://git.kernel.org/stable/c/a0cafb7b0b94d18e4813ee4b712a056f280e7b5a"},{"url":"https://git.kernel.org/stable/c/feac2391e26b086f73be30e9b1ab215eada8d830"},{"url":"https://git.kernel.org/stable/c/b4eb25a3d70df925a9fa4e82d17a958a0a228f5f"},{"url":"https://git.kernel.org/stable/c/522c3336c2025818fa05e9daf0ac35711e55e316"},{"url":"https://git.kernel.org/stable/c/9f9c79d8e527d867e0875868b14fb76e6011e70c"},{"url":"https://git.kernel.org/stable/c/cf28ff8e4c02e1ffa850755288ac954b6ff0db8c"}],"title":"ila: block BH in ila_output()","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program 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