222 lines
12 KiB
JSON
222 lines
12 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-23383",
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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": "2026-01-13T15:37:46.007Z",
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"datePublished": "2026-03-25T10:28:02.126Z",
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"dateUpdated": "2026-10-30T12:24:03.405Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-30T12:24:03.405Z"
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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, arm64: Force 8-byte alignment for JIT buffer to prevent atomic tearing\n\nstruct bpf_plt contains a u64 target field. Currently, the BPF JIT\nallocator requests an alignment of 4 bytes (sizeof(u32)) for the JIT\nbuffer.\n\nBecause the base address of the JIT buffer can be 4-byte aligned (e.g.,\nending in 0x4 or 0xc), the relative padding logic in build_plt() fails\nto ensure that target lands on an 8-byte boundary.\n\nThis leads to two issues:\n1. UBSAN reports misaligned-access warnings when dereferencing the\n structure.\n2. More critically, target is updated concurrently via WRITE_ONCE() in\n bpf_arch_text_poke() while the JIT'd code executes ldr. On arm64,\n 64-bit loads/stores are only guaranteed to be single-copy atomic if\n they are 64-bit aligned. A misaligned target risks a torn read,\n causing the JIT to jump to a corrupted address.\n\nFix this by increasing the allocation alignment requirement to 8 bytes\n(sizeof(u64)) in bpf_jit_binary_pack_alloc(). This anchors the base of\nthe JIT buffer to an 8-byte boundary, allowing the relative padding math\nin build_plt() to correctly align the target field."
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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 - BPF is accessed via the bpf() syscall, requiring local system access. There is no remote or adjacent network path to trigger BPF program loading or trampoline attachment.\nAC:L - The attacker controls both sides of the race — they load the BPF program (creating the misaligned PLT) and trigger the text_poke (by attaching a trampoline). The ~50% misalignment chance is overcome by loading multiple programs. No conditions beyond attacker control are needed.\nPR:L - While CAP_BPF and CAP_PERFMON are required, the BPF token delegation mechanism allows these capabilities to be granted to users in user namespaces. This is a supported, reasonable deployment scenario for containerized BPF workloads.\nUI:N - No user interaction is required. The attacker independently loads BPF programs and attaches trampolines.\nS:U - The vulnerability results in kernel-level control flow corruption within the same security authority. No VM escape, IOMMU bypass, or sandbox boundary crossing occurs.\nC:H - The torn PLT target causes a kernel-mode jump to a corrupted address, which is a control-flow hijack in kernel context. This could be leveraged to read arbitrary kernel memory through code execution.\nI:H - A kernel-mode jump to a corrupted address constitutes control-flow hijacking that could be leveraged for arbitrary code execution in kernel context, enabling arbitrary memory writes.\nA:H - Jumping to a corrupted address in kernel mode will almost certainly cause a kernel panic/oops, resulting in complete denial of service."
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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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"arch/arm64/net/bpf_jit_comp.c"
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],
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"versions": [
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{
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"version": "b2ad54e1533e91449cb2a371e034942bd7882b58",
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"lessThan": "fcb9c6275f712860c22c96a472b73d05cabb75cd",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "b2ad54e1533e91449cb2a371e034942bd7882b58",
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"lessThan": "f5a41b61b5faae1965a5a2cb55322fe8f17e3b2d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "b2ad54e1533e91449cb2a371e034942bd7882b58",
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"lessThan": "80ad264da02cc4aee718e799c2b79f0f834673dc",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "b2ad54e1533e91449cb2a371e034942bd7882b58",
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"lessThan": "519b1ad91de5bf7a496f2b858e9212db6328e1de",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "b2ad54e1533e91449cb2a371e034942bd7882b58",
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"lessThan": "66959ed481a474eaae278c7f6860a2a9b188a4d6",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "b2ad54e1533e91449cb2a371e034942bd7882b58",
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"lessThan": "ef06fd16d48704eac868441d98d4ef083d8f3d07",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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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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"arch/arm64/net/bpf_jit_comp.c"
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],
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"versions": [
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{
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"version": "6.0",
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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": "6.0",
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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": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.160",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.77",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.17",
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"lessThanOrEqual": "6.18.*",
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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": "6.19.7",
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"lessThanOrEqual": "6.19.*",
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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": "7.0",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.0",
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"versionEndExcluding": "6.1.191"
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.0",
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"versionStartIncluding": "6.0",
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}
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/fcb9c6275f712860c22c96a472b73d05cabb75cd"
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},
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{
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"url": "https://git.kernel.org/stable/c/f5a41b61b5faae1965a5a2cb55322fe8f17e3b2d"
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},
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{
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"url": "https://git.kernel.org/stable/c/80ad264da02cc4aee718e799c2b79f0f834673dc"
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{
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"url": "https://git.kernel.org/stable/c/519b1ad91de5bf7a496f2b858e9212db6328e1de"
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{
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"url": "https://git.kernel.org/stable/c/66959ed481a474eaae278c7f6860a2a9b188a4d6"
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},
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{
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"url": "https://git.kernel.org/stable/c/ef06fd16d48704eac868441d98d4ef083d8f3d07"
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}
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],
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"title": "bpf, arm64: Force 8-byte alignment for JIT buffer to prevent atomic tearing",
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