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

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-08-17 05:06
VLAI
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
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c22b0bcb1dd024cb9caad9230e3a387d8b061df5 , < 5da5cf48a432e30ded8d58087854e5383a36eff1 (git)
Affected: c22b0bcb1dd024cb9caad9230e3a387d8b061df5 , < c386e1c591d72eab58ee2e69105c8cbc70928857 (git)
Affected: c22b0bcb1dd024cb9caad9230e3a387d8b061df5 , < 2faf0198168d2017cb528a79f76c560fda3b6e94 (git)
Affected: c22b0bcb1dd024cb9caad9230e3a387d8b061df5 , < 91b4d76dd07f1a1f20f73dfebb42ba04ac911a56 (git)
Affected: c22b0bcb1dd024cb9caad9230e3a387d8b061df5 , < bc7b086a45521a986a49045907f017e3e46c763e (git)
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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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{
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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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    "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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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T17:48:01+00:00",
      "cve": "CVE-2026-72028",
      "id": "CVE-2026-72028",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: riscv: probes: save original sp in rethook trampoline",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72028.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.