{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-43840", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-17T09:11:59.274Z", "datePublished": "2024-08-17T09:21:55.841Z", "dateUpdated": "2026-08-05T11:36:42.708Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:36:42.708Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, arm64: Fix trampoline for BPF_TRAMP_F_CALL_ORIG\n\nWhen BPF_TRAMP_F_CALL_ORIG is set, the trampoline calls\n__bpf_tramp_enter() and __bpf_tramp_exit() functions, passing them\nthe struct bpf_tramp_image *im pointer as an argument in R0.\n\nThe trampoline generation code uses emit_addr_mov_i64() to emit\ninstructions for moving the bpf_tramp_image address into R0, but\nemit_addr_mov_i64() assumes the address to be in the vmalloc() space\nand uses only 48 bits. Because bpf_tramp_image is allocated using\nkzalloc(), its address can use more than 48-bits, in this case the\ntrampoline will pass an invalid address to __bpf_tramp_enter/exit()\ncausing a kernel crash.\n\nFix this by using emit_a64_mov_i64() in place of emit_addr_mov_i64()\nas it can work with addresses that are greater than 48-bits." } ], "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 - The vulnerable trampoline is generated through the local `bpf()` syscall (BPF_PROG_LOAD + link attach of an fexit/fmod_ret tracing program); there is no network-reachable path to the arm64 JIT.\nAC:L - On an affected system the miscompilation is deterministic — `emit_addr_mov_i64()` unconditionally clobbers bits 48-63 of the kzalloc'd `bpf_tramp_image` address, so every fexit/fmod_ret attach produces a broken trampoline that the attacker triggers simply by invoking the traced function. No race, timing window, or memory layout outside the attacker's influence is involved.\nPR:L - Loading and attaching a BPF_PROG_TYPE_TRACING program requires CAP_BPF plus CAP_PERFMON, which is a delegated non-root capability set commonly granted to unprivileged observability/container workloads and to userns-confined tasks via BPF tokens, not full administrative root.\nUI:N - The attacker loads the program, attaches it, and calls the traced kernel function entirely on its own; no victim action is needed.\nS:U - The wild pointer dereference and any resulting corruption occur within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `percpu_ref_get()` reads `ref->percpu_count_ptr` from a forged kernel address outside the intended object and treats the result as a live per-CPU pointer, and the broken image refcount can leave freed executable trampoline memory in use — memory corruption of this class is leverageable for kernel memory disclosure.\nI:H - After the wild read, `this_cpu_add(*percpu_count, 1)` (or `atomic_long_add(&ref->data->count)`) performs a read-modify-write through the garbage value, an uncontrolled kernel memory write; additionally the trampoline's liveness refcount is taken on the wrong object, permitting use-after-free of the JIT'd executable image.\nA:H - The forged address lands far outside mapped linear memory, so the first invocation of the traced function takes an unhandled kernel paging fault (oops/panic, possibly in atomic or softirq context), and the poisoned trampoline remains installed so every later call to that function faults again." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/arm64/net/bpf_jit_comp.c" ], "versions": [ { "version": "efc9909fdce00a827a37609628223cd45bf95d0b", "lessThan": "077149478497b2f00ff4fd9da2c892defa6418d8", "status": "affected", "versionType": "git" }, { "version": "efc9909fdce00a827a37609628223cd45bf95d0b", "lessThan": "d9664e6ff040798a46cdc5d401064f55b8676c83", "status": "affected", "versionType": "git" }, { "version": "efc9909fdce00a827a37609628223cd45bf95d0b", "lessThan": "6d218fcc707d6b2c3616b6cd24b948fd4825cfec", "status": "affected", "versionType": "git" }, { "version": "efc9909fdce00a827a37609628223cd45bf95d0b", "lessThan": "19d3c179a37730caf600a97fed3794feac2b197b", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/arm64/net/bpf_jit_comp.c" ], "versions": [ { "version": "6.0", "status": "affected" }, { "version": "0", "lessThan": "6.0", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.140", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.92", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10.3", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11", "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": "6.0", "versionEndExcluding": "6.1.140" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.6.92" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.10.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.11" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/077149478497b2f00ff4fd9da2c892defa6418d8" }, { "url": "https://git.kernel.org/stable/c/d9664e6ff040798a46cdc5d401064f55b8676c83" }, { "url": "https://git.kernel.org/stable/c/6d218fcc707d6b2c3616b6cd24b948fd4825cfec" }, { "url": "https://git.kernel.org/stable/c/19d3c179a37730caf600a97fed3794feac2b197b" } ], "title": "bpf, arm64: Fix trampoline for BPF_TRAMP_F_CALL_ORIG", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-43840", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T16:07:58.806748Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-12T17:33:04.569Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:30:44.552Z" } } ] } }