194 lines
10 KiB
JSON
194 lines
10 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveId": "CVE-2024-42072",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-07-29T15:50:41.168Z",
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"datePublished": "2024-07-29T15:52:35.598Z",
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"dateUpdated": "2026-08-05T11:35:30.329Z"
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"dateUpdated": "2026-08-05T11:35:30.329Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix may_goto with negative offset.\n\nZac's syzbot crafted a bpf prog that exposed two bugs in may_goto.\nThe 1st bug is the way may_goto is patched. When offset is negative\nit should be patched differently.\nThe 2nd bug is in the verifier:\nwhen current state may_goto_depth is equal to visited state may_goto_depth\nit means there is an actual infinite loop. It's not correct to prune\nexploration of the program at this point.\nNote, that this check doesn't limit the program to only one may_goto insn,\nsince 2nd and any further may_goto will increment may_goto_depth only\nin the queued state pushed for future exploration. The current state\nwill have may_goto_depth == 0 regardless of number of may_goto insns\nand the verifier has to explore the program until bpf_exit."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerability is reached through the bpf(BPF_PROG_LOAD) syscall, which requires local access to the machine; the mis-patched program is then run by attaching it to the attacker's own socket. No network-facing service parses the malicious input.\nAC:L - The attacker fully authors the BPF program and chooses the negative may_goto offset, so the 3-instruction control-flow skew is deterministic and reproducible on every load — no race, timing window, or unpredictable memory layout is involved.\nPR:L - may_goto carries no capability check in the verifier, and an unprivileged local user can load a BPF_PROG_TYPE_SOCKET_FILTER program whenever kernel.unprivileged_bpf_disabled is 0, or via a delegated BPF token / container-granted CAP_BPF (syscall.c:2753). Basic local user access is sufficient.\nUI:N - The attacker loads and attaches the program entirely on their own; execution is triggered by their own socket traffic with no action by any other user or administrator.\nS:U - The corruption occurs in kernel memory of the same host and results in a conventional local privilege escalation; no VM, IOMMU, or other security-authority boundary is crossed.\nC:H - The verified-vs-executed control-flow divergence lets the attacker skip the bounds/mask instructions guarding a load, turning it into a read from an attacker-chosen address — an arbitrary kernel memory read primitive that discloses arbitrary kernel data.\nI:H - The same primitive applied to a store gives an arbitrary kernel memory write with attacker-controlled address and value, a full verifier bypass that enables control-flow hijacking and privilege escalation.\nA:H - With off == -3 the patched JEQ becomes a self-jump, producing an unbreakable in-kernel loop (hard lockup / RCU stall), and the broken is_state_visited() check independently lets genuinely infinite loops pass verification; corrupted memory accesses also readily panic the kernel."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"kernel/bpf/verifier.c"
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],
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"versions": [
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{
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"kernel/bpf/verifier.c"
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"versions": [
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"version": "6.9",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.9",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.9.8",
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"lessThanOrEqual": "6.9.*",
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"status": "unaffected",
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"version": "6.10",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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"references": [
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"title": "bpf: Fix may_goto with negative offset.",
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"dateUpdated": "2024-08-02T04:54:31.986Z"
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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