Linux Kernel up to 7.2-rc1 RISC-V Probes regs_get_kernel_stack_nth stack-based overflow

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CTI Interest Score
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4.2$0-$5k0.47+

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 6.6.144/6.12.96/6.18.39/7.1.4/7.2-rc1. This affects the function regs_get_kernel_stack_nth of the component RISC-V Probes. Performing a manipulation results in stack-based overflow. This vulnerability is reported as CVE-2026-72028. The attack requires a local approach. No exploit exists.

Detailsinfo

A vulnerability classified as problematic has been found in Linux Kernel up to 6.6.144/6.12.96/6.18.39/7.1.4/7.2-rc1. This affects the function regs_get_kernel_stack_nth of the component RISC-V Probes. The manipulation with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on availability. The summary by CVE is:

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. [[email protected]: added Fixes tag; cc'ed stable]

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-72028 since 08/09/2026. The exploitability is told to be easy. Attacking locally is a requirement. Additional levels of successful authentication are required for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 6.6.145, 6.12.97, 6.18.40, 7.1.5 or 7.2-rc2 eliminates this vulnerability. Applying the patch 5da5cf48a432e30ded8d58087854e5383a36eff1/c386e1c591d72eab58ee2e69105c8cbc70928857/2faf0198168d2017cb528a79f76c560fda3b6e94/91b4d76dd07f1a1f20f73dfebb42ba04ac911a56/bc7b086a45521a986a49045907f017e3e46c763e is able to eliminate this problem.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.2

VulDB Base Score: 4.4
VulDB Temp Score: 4.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.145/6.12.97/6.18.40/7.1.5/7.2-rc2
Patch: 5da5cf48a432e30ded8d58087854e5383a36eff1/c386e1c591d72eab58ee2e69105c8cbc70928857/2faf0198168d2017cb528a79f76c560fda3b6e94/91b4d76dd07f1a1f20f73dfebb42ba04ac911a56/bc7b086a45521a986a49045907f017e3e46c763e

Timelineinfo

08/09/2026 CVE reserved
08/15/2026 +6 days Advisory disclosed
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-72028 (🔒)
GCVE (CVE): GCVE-0-2026-72028
GCVE (VulDB): GCVE-100-390447

Entryinfo

Created: 08/15/2026 11:27
Changes: 08/15/2026 11:27 (59)
Complete: 🔍
Cache ID: 216::103

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