{"dataType":"CVE_RECORD","cveMetadata":{"cveId":"CVE-2024-27431","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-02-25T13:47:42.686Z","datePublished":"2024-05-17T12:02:10.274Z","dateUpdated":"2026-08-05T11:29:46.451Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:29:46.451Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncpumap: Zero-initialise xdp_rxq_info struct before running XDP program\n\nWhen running an XDP program that is attached to a cpumap entry, we don't\ninitialise the xdp_rxq_info data structure being used in the xdp_buff\nthat backs the XDP program invocation. Tobias noticed that this leads to\nrandom values being returned as the xdp_md->rx_queue_index value for XDP\nprograms running in a cpumap.\n\nThis means we're basically returning the contents of the uninitialised\nmemory, which is bad. Fix this by zero-initialising the rxq data\nstructure before running the XDP program."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - Exploitation requires the attacker to load a BPF program and populate a CPUMAP entry via the local bpf() syscall, then attach XDP to a local netdev; network packets only serve as the trigger the attacker generates themselves. No remote peer can reach this code path.\nAC:L - The uninitialized read is deterministic on every cpumap XDP invocation, and the attacker fully controls the setup (own veth/MTU, own XDP program, own traffic), so it can be triggered repeatedly and reliably, including grooming the kthread stack residue across unlimited retries.\nPR:L - Requires CAP_BPF plus CAP_NET_ADMIN, which are routinely delegated to non-root network daemons and container workloads (Cilium-style XDP/cpumap pipelines) rather than requiring full root; consistent with scoring of other BPF/XDP subsystem issues.\nUI:N - The attacker performs every step — map creation, program attach, and packet injection through their own interface — with no action needed from any other user.\nS:U - Both the uninitialized stack disclosure and the out-of-bounds fragment write are contained within the kernel's own security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - Uninitialized cpumap kthread stack memory is handed directly to the BPF program via xdp_md->rx_queue_index and exfiltrated to userspace, repeatedly and with groomable content, leaking kernel pointers; the accompanying frag_size corruption additionally provides memory-corruption primitives leverageable for broader disclosure.\nI:H - Garbage rxq.frag_size makes the unsigned tailroom computation in bpf_xdp_frags_increase_tail() underflow, bypassing the bounds check and permitting memset() of an attacker-chosen length past the last fragment — an out-of-bounds heap write, plus inconsistent sinfo->xdp_frags_size accounting propagated into subsequent skb construction.\nA:H - The out-of-bounds zeroing of adjacent page/heap memory corrupts unrelated kernel structures and leads to oops or panic, and the bogus queue_index/frag_size values also cause misrouted XSK redirects and inconsistent frame accounting in the receive path."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/cpumap.c"],"versions":[{"version":"9216477449f33cdbc9c9a99d49f500b7fbb81702","lessThan":"5f4e51abfbe6eb444fa91906a5cd083044278297","status":"affected","versionType":"git"},{"version":"9216477449f33cdbc9c9a99d49f500b7fbb81702","lessThan":"f0363af9619c77730764f10360e36c6445c12f7b","status":"affected","versionType":"git"},{"version":"9216477449f33cdbc9c9a99d49f500b7fbb81702","lessThan":"3420b3ff1ff489c177ea1cb7bd9fbbc4e9a0be95","status":"affected","versionType":"git"},{"version":"9216477449f33cdbc9c9a99d49f500b7fbb81702","lessThan":"f562e4c4aab00986dde3093c4be919c3f2b85a4a","status":"affected","versionType":"git"},{"version":"9216477449f33cdbc9c9a99d49f500b7fbb81702","lessThan":"eaa7cb836659ced2d9f814ac32aa3ec193803ed6","status":"affected","versionType":"git"},{"version":"9216477449f33cdbc9c9a99d49f500b7fbb81702","lessThan":"2487007aa3b9fafbd2cb14068f49791ce1d7ede5","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/cpumap.c"],"versions":[{"version":"5.9","status":"affected"},{"version":"0","lessThan":"5.9","status":"unaffected","versionType":"semver"},{"version":"5.10.213","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.152","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.82","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.22","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.7.10","lessThanOrEqual":"6.7.*","status":"unaffected","versionType":"semver"},{"version":"6.8","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":"5.9","versionEndExcluding":"5.10.213"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"5.15.152"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.1.82"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.6.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.7.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.8"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/5f4e51abfbe6eb444fa91906a5cd083044278297"},{"url":"https://git.kernel.org/stable/c/f0363af9619c77730764f10360e36c6445c12f7b"},{"url":"https://git.kernel.org/stable/c/3420b3ff1ff489c177ea1cb7bd9fbbc4e9a0be95"},{"url":"https://git.kernel.org/stable/c/f562e4c4aab00986dde3093c4be919c3f2b85a4a"},{"url":"https://git.kernel.org/stable/c/eaa7cb836659ced2d9f814ac32aa3ec193803ed6"},{"url":"https://git.kernel.org/stable/c/2487007aa3b9fafbd2cb14068f49791ce1d7ede5"}],"title":"cpumap: Zero-initialise xdp_rxq_info struct before running XDP program","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","cweId":"CWE-908","lang":"en","description":"CWE-908 Use of Uninitialized 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