Vulnerability-Lookup

GHSA-RJ58-8R73-76RG

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-15 06:32

Details

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

riscv: probes: save original sp in rethook trampoline

Reading a word from the stack in a kretprobe crashes a risc-v kernel.

$ cd /sys/kernel/tracing/ $ echo 'r n_tty_write $stack0' > dynamic_events $ echo 1 > events/kprobes/enable Unable to handle kernel paging request at virtual address 0000000200000128 ... [] regs_get_kernel_stack_nth+0x26/0x38 [] process_fetch_insn+0x3ee/0x760 [] kretprobe_trace_func+0x116/0x1f0 [] kretprobe_dispatcher+0x4a/0x58 [] kretprobe_rethook_handler+0x5e/0x90 [] rethook_trampoline_handler+0x70/0x108 [] arch_rethook_trampoline_callback+0x12/0x1c [] arch_rethook_trampoline+0x48/0x94 [] tty_write+0x1a/0x30

In regs_get_kernel_stack_nth, regs->sp contains an arbitrary value.

arch_rethook_trampoline saves the registers from the probed function in a struct pt_regs. sp is not saved. Instead, sp is decremented for arch_rethook_trampoline's local stack.

Fix this crash and save the original sp along with the other registers. Use a0 as a temporary register, it is overwritten anyway.

[pjw@kernel.org: added Fixes tag; cc'ed stable]

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72028"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:01Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: probes: save original sp in rethook trampoline\n\nReading a word from the stack in a kretprobe crashes a risc-v kernel.\n\n$ cd /sys/kernel/tracing/\n$ echo \u0027r n_tty_write $stack0\u0027 \u003e dynamic_events\n$ echo 1 \u003e events/kprobes/enable\nUnable to handle kernel paging request at virtual address 0000000200000128\n...\n[\u003cffffffff80016d16\u003e] regs_get_kernel_stack_nth+0x26/0x38\n[\u003cffffffff80177196\u003e] process_fetch_insn+0x3ee/0x760\n[\u003cffffffff80177836\u003e] kretprobe_trace_func+0x116/0x1f0\n[\u003cffffffff8017795a\u003e] kretprobe_dispatcher+0x4a/0x58\n[\u003cffffffff8013572e\u003e] kretprobe_rethook_handler+0x5e/0x90\n[\u003cffffffff80180838\u003e] rethook_trampoline_handler+0x70/0x108\n[\u003cffffffff8001ba32\u003e] arch_rethook_trampoline_callback+0x12/0x1c\n[\u003cffffffff8001ba84\u003e] arch_rethook_trampoline+0x48/0x94\n[\u003cffffffff8067872a\u003e] tty_write+0x1a/0x30\n\nIn regs_get_kernel_stack_nth, regs-\u003esp contains an arbitrary value.\n\narch_rethook_trampoline saves the registers from the probed function in a\nstruct pt_regs. sp is not saved. Instead, sp is decremented for\narch_rethook_trampoline\u0027s local stack.\n\nFix this crash and save the original sp along with the other registers.\nUse a0 as a temporary register, it is overwritten anyway.\n\n[pjw@kernel.org: added Fixes tag; cc\u0027ed stable]",
  "id": "GHSA-rj58-8r73-76rg",
  "modified": "2026-08-15T06:32:09Z",
  "published": "2026-08-15T06:32:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72028"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2faf0198168d2017cb528a79f76c560fda3b6e94"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5da5cf48a432e30ded8d58087854e5383a36eff1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/91b4d76dd07f1a1f20f73dfebb42ba04ac911a56"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bc7b086a45521a986a49045907f017e3e46c763e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c386e1c591d72eab58ee2e69105c8cbc70928857"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-72028 (GCVE-0-2026-72028)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-08-17 05:06

Title

riscv: probes: save original sp in rethook trampoline

Summary

In the Linux kernel, the following vulnerability has been resolved: riscv: probes: save original sp in rethook trampoline Reading a word from the stack in a kretprobe crashes a risc-v kernel. $ cd /sys/kernel/tracing/ $ echo 'r n_tty_write $stack0' > dynamic_events $ echo 1 > events/kprobes/enable Unable to handle kernel paging request at virtual address 0000000200000128 ... [<ffffffff80016d16>] regs_get_kernel_stack_nth+0x26/0x38 [<ffffffff80177196>] process_fetch_insn+0x3ee/0x760 [<ffffffff80177836>] kretprobe_trace_func+0x116/0x1f0 [<ffffffff8017795a>] kretprobe_dispatcher+0x4a/0x58 [<ffffffff8013572e>] kretprobe_rethook_handler+0x5e/0x90 [<ffffffff80180838>] rethook_trampoline_handler+0x70/0x108 [<ffffffff8001ba32>] arch_rethook_trampoline_callback+0x12/0x1c [<ffffffff8001ba84>] arch_rethook_trampoline+0x48/0x94 [<ffffffff8067872a>] tty_write+0x1a/0x30 In regs_get_kernel_stack_nth, regs->sp contains an arbitrary value. arch_rethook_trampoline saves the registers from the probed function in a struct pt_regs. sp is not saved. Instead, sp is decremented for arch_rethook_trampoline's local stack. Fix this crash and save the original sp along with the other registers. Use a0 as a temporary register, it is overwritten anyway. [pjw@kernel.org: added Fixes tag; cc'ed stable]

Severity

No CVSS data available.

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/5da5cf48a432e30de…
https://git.kernel.org/stable/c/c386e1c591d72eab5…
https://git.kernel.org/stable/c/2faf0198168d2017c…
https://git.kernel.org/stable/c/91b4d76dd07f1a1f2…
https://git.kernel.org/stable/c/bc7b086a45521a986…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c22b0bcb1dd024cb9caad9230e3a387d8b061df5 , < 5da5cf48a432e30ded8d58087854e5383a36eff1 (git) Affected: c22b0bcb1dd024cb9caad9230e3a387d8b061df5 , < c386e1c591d72eab58ee2e69105c8cbc70928857 (git) Affected: c22b0bcb1dd024cb9caad9230e3a387d8b061df5 , < 2faf0198168d2017cb528a79f76c560fda3b6e94 (git) Affected: c22b0bcb1dd024cb9caad9230e3a387d8b061df5 , < 91b4d76dd07f1a1f20f73dfebb42ba04ac911a56 (git) Affected: c22b0bcb1dd024cb9caad9230e3a387d8b061df5 , < bc7b086a45521a986a49045907f017e3e46c763e (git)
Linux	Linux	Affected: 5.12 Unaffected: 0 , < 5.12 (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "arch/riscv/kernel/probes/rethook_trampoline.S"
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              "status": "affected",
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              "versionType": "git"
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            {
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: probes: save original sp in rethook trampoline\n\nReading a word from the stack in a kretprobe crashes a risc-v kernel.\n\n$ cd /sys/kernel/tracing/\n$ echo \u0027r n_tty_write $stack0\u0027 \u003e dynamic_events\n$ echo 1 \u003e events/kprobes/enable\nUnable to handle kernel paging request at virtual address 0000000200000128\n...\n[\u003cffffffff80016d16\u003e] regs_get_kernel_stack_nth+0x26/0x38\n[\u003cffffffff80177196\u003e] process_fetch_insn+0x3ee/0x760\n[\u003cffffffff80177836\u003e] kretprobe_trace_func+0x116/0x1f0\n[\u003cffffffff8017795a\u003e] kretprobe_dispatcher+0x4a/0x58\n[\u003cffffffff8013572e\u003e] kretprobe_rethook_handler+0x5e/0x90\n[\u003cffffffff80180838\u003e] rethook_trampoline_handler+0x70/0x108\n[\u003cffffffff8001ba32\u003e] arch_rethook_trampoline_callback+0x12/0x1c\n[\u003cffffffff8001ba84\u003e] arch_rethook_trampoline+0x48/0x94\n[\u003cffffffff8067872a\u003e] tty_write+0x1a/0x30\n\nIn regs_get_kernel_stack_nth, regs-\u003esp contains an arbitrary value.\n\narch_rethook_trampoline saves the registers from the probed function in a\nstruct pt_regs. sp is not saved. Instead, sp is decremented for\narch_rethook_trampoline\u0027s local stack.\n\nFix this crash and save the original sp along with the other registers.\nUse a0 as a temporary register, it is overwritten anyway.\n\n[pjw@kernel.org: added Fixes tag; cc\u0027ed stable]"
        }
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        "dateUpdated": "2026-08-17T05:06:52.840Z",
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        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/bc7b086a45521a986a49045907f017e3e46c763e"
        }
      ],
      "title": "riscv: probes: save original sp in rethook trampoline",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72028",
    "datePublished": "2026-08-15T05:51:51.868Z",
    "dateReserved": "2026-08-09T03:40:39.901Z",
    "dateUpdated": "2026-08-17T05:06:52.840Z",
    "state": "PUBLISHED"
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}

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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GHSA-RJ58-8R73-76RG

CVE-2026-72028 (GCVE-0-2026-72028)

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Nomenclature