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GHSA-4C82-VPVX-8VW4

Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-18 18:31

Details

In the Linux kernel, the following vulnerability has been resolved:

bpf, x86: Fix trampoline stack size for 128-bit arguments

btf_distill_func_proto() accepts a function argument up to 16 bytes, so a 128-bit scalar such as __int128 reaches the x86 trampoline with arg_size == 16. But the current implementation assumes an __int128 argument only needs one register, so the register save area is under-allocated and save_args() overwrites adjacent stack slots.

Compute the register count from arg_size for all arguments to fix it.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-90358"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-17T17:17:34Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, x86: Fix trampoline stack size for 128-bit arguments\n\nbtf_distill_func_proto() accepts a function argument up to 16 bytes, so a\n128-bit scalar such as __int128 reaches the x86 trampoline with\narg_size == 16. But the current implementation assumes an __int128\nargument only needs one register, so the register save area is\nunder-allocated and save_args() overwrites adjacent stack slots.\n\nCompute the register count from arg_size for all arguments to fix it.",
  "id": "GHSA-4c82-vpvx-8vw4",
  "modified": "2026-09-18T18:31:30Z",
  "published": "2026-09-17T18:32:02Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90358"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/40f3bfbbb222b92278f3797614b70f68d46824ac"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4aed2346fa9b88d458eeb8c01123f3c07585a675"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/814cba835ef648e0c5eb79505c96c0493b29eea6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a6d7d7a253c550e74b0651897fe313c2f9b2301f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-90358 (GCVE-0-2026-90358)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:09 – Updated: 2026-09-18 17:54

Title

bpf, x86: Fix trampoline stack size for 128-bit arguments

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf, x86: Fix trampoline stack size for 128-bit arguments btf_distill_func_proto() accepts a function argument up to 16 bytes, so a 128-bit scalar such as __int128 reaches the x86 trampoline with arg_size == 16. But the current implementation assumes an __int128 argument only needs one register, so the register save area is under-allocated and save_args() overwrites adjacent stack slots. Compute the register count from arg_size for all arguments to fix it.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/4aed2346fa9b88d45…
https://git.kernel.org/stable/c/40f3bfbbb222b9227…
https://git.kernel.org/stable/c/a6d7d7a253c550e74…
https://git.kernel.org/stable/c/814cba835ef648e0c…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 , < 4aed2346fa9b88d458eeb8c01123f3c07585a675 (git) Affected: a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 , < 40f3bfbbb222b92278f3797614b70f68d46824ac (git) Affected: a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 , < a6d7d7a253c550e74b0651897fe313c2f9b2301f (git) Affected: a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 , < 814cba835ef648e0c5eb79505c96c0493b29eea6 (git)
Linux	Linux	Affected: 6.1 Unaffected: 0 , < 6.1 (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/net/bpf_jit_comp.c"
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          "versions": [
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "40f3bfbbb222b92278f3797614b70f68d46824ac",
              "status": "affected",
              "version": "a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2",
              "versionType": "git"
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              "status": "affected",
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          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "version": "6.12.110",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
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              "version": "7.3-rc1",
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      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "6.1",
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                },
                {
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, x86: Fix trampoline stack size for 128-bit arguments\n\nbtf_distill_func_proto() accepts a function argument up to 16 bytes, so a\n128-bit scalar such as __int128 reaches the x86 trampoline with\narg_size == 16. But the current implementation assumes an __int128\nargument only needs one register, so the register save area is\nunder-allocated and save_args() overwrites adjacent stack slots.\n\nCompute the register count from arg_size for all arguments to fix it."
        }
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              "lang": "en",
              "value": "AV:L - The under-allocation is in __arch_prepare_bpf_trampoline()/save_args() in arch/x86/net/bpf_jit_comp.c and is reached only when a local process issues bpf(BPF_PROG_LOAD) for BPF_PROG_TYPE_TRACING fentry/fexit and bpf(BPF_LINK_CREATE) against a BTF function with a 16-byte integer argument. BPF is a local syscall vector, not a network protocol parser.\nAC:L - The attacker selects an attach target whose BTF has arg_size==16 without BTF_FMODEL_STRUCT_ARG (e.g. bpf_testmod_test_int128_arg). __arch_prepare_bpf_trampoline() then under-counts nr_regs by one slot per such argument and save_args() deterministically overwrites the next stack slot; no race or uninfluenced layout is required.\nPR:L - bpf_prog_load() rejects BPF_PROG_TYPE_TRACING unless bpf_token_capable(CAP_BPF) and, via is_perfmon_prog_type(), bpf_token_capable(CAP_PERFMON). Those capabilities are delegable with BPF tokens and are scored Low, not init-namespace root, consistent with other BPF trampoline CVEs.\nUI:N - The attacker loads the fentry/fexit program, attaches it with BPF_LINK_CREATE, and invokes the target themselves (for bpf_testmod, a read of the module sysfs test file that calls bpf_testmod_test_int128_arg). No separate victim mount or click is required.\nS:U - save_args() overwrites the trampoline\u0027s own saved RBP and adjacent slots in the host kernel stack. That is in-kernel memory corruption on the same authority, not a KVM/Xen guest-to-host, IOMMU, or sandbox boundary crossing.\nC:H - The extra 8-byte store of the __int128\u0027s second register (RSI) lands in adjacent trampoline slots. On an fentry trampoline without a return-value slot that is saved RBP, so leave pivots RSP through argument contents and subsequent pops/unwinds can disclose kernel stack/memory.\nI:H - The same OOB store overwrites saved RBP (and with two 16-byte scalars, the return address at RBP+8). The trampoline epilogue then executes leave; ret on a corrupted frame, which is kernel stack memory corruption exploitable for a stack pivot and control-flow hijack.\nA:H - Overwriting saved RBP with the high half of a small __int128 (0 for bpf_testmod_test_int128_arg((__int128)1,...)) makes leave load a bogus frame pointer, so the following pop/ret oopses or panics the kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-18T17:54:50.685Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/814cba835ef648e0c5eb79505c96c0493b29eea6"
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      ],
      "title": "bpf, x86: Fix trampoline stack size for 128-bit arguments",
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    "cveId": "CVE-2026-90358",
    "datePublished": "2026-09-17T16:09:03.531Z",
    "dateReserved": "2026-09-11T19:38:34.806Z",
    "dateUpdated": "2026-09-18T17:54:50.685Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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GHSA-4C82-VPVX-8VW4

CVE-2026-90358 (GCVE-0-2026-90358)

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