Answer in brief
CVE-2025-71221 records a High severity (CVSS 7.0) vulnerability in dmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2025-71221 records a High severity (CVSS 7.0) vulnerability in dmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1b38da264674d6a0fe26a63996b8f88b88c3da48 <3f0e0e2d9e752570041e95fd04635e2580097819 || >=1b38da264674d6a0fe26a63996b8f88b88c3da48 <dfb5e05227745de43b7fd589721817a4337c970d || >=1b38da264674d6a0fe26a63996b8f88b88c3da48 <eba0c75670c022cb1f948600db972524bcfe8166 || >=1b38da264674d6a0fe26a63996b8f88b88c3da48 <fc023b8fab057f0c910856ff36d3e12a30b7af4a || >=1b38da264674d6a0fe26a63996b8f88b88c3da48 <9f665b3c3d9a168410251f27a5d019b7bf93185c || >=1b38da264674d6a0fe26a63996b8f88b88c3da48 <a143545855bc2c6e1330f6f57ae375ac44af00a7 | 3f0e0e2d9e752570041e95fd04635e2580097819, dfb5e05227745de43b7fd589721817a4337c970d, eba0c75670c022cb1f948600db972524bcfe8166, fc023b8fab057f0c910856ff36d3e12a30b7af4a, 9f665b3c3d9a168410251f27a5d019b7bf93185c, a143545855bc2c6e1330f6f57ae375ac44af00a7 |
| Linux/Linuxgeneric | 3.16 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
Feb 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
In the Linux kernel, the following vulnerability has been resolved: dmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue() Add proper locking in mmp_pdma_residue() to prevent use-after-free when accessing descriptor list and descriptor contents. The race occurs when multiple threads call tx_status() while the tasklet on another CPU is freeing completed descriptors: CPU 0 CPU 1 ----- ----- mmp_pdma_tx_status() mmp_pdma_residue() -> NO LOCK held list_for_each_entry(sw, ..) DMA interrupt dma_do_tasklet() -> spin_lock(&desc_lock) list_move(sw->node, ...) spin_unlock(&desc_lock) | dma_pool_free(sw) <- FREED! -> access sw->desc <- UAF! This issue can be reproduced when running dmatest on the same channel with multiple threads (threads_per_chan > 1). Fix by protecting the chain_running list iteration and descriptor access with the chan->desc_lock spinlock.
Quoted source text, attributed separately from HOL analysis.
CVSS is 7.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1b38da264674d6a0fe26a63996b8f88b88c3da48 <3f0e0e2d9e752570041e95fd04635e2580097819 || >=1b38da264674d6a0fe26a63996b8f88b88c3da48 <dfb5e05227745de43b7fd589721817a4337c970d || >=1b38da264674d6a0fe26a63996b8f88b88c3da48 <eba0c75670c022cb1f948600db972524bcfe8166 || >=1b38da264674d6a0fe26a63996b8f88b88c3da48 <fc023b8fab057f0c910856ff36d3e12a30b7af4a || >=1b38da264674d6a0fe26a63996b8f88b88c3da48 <9f665b3c3d9a168410251f27a5d019b7bf93185c || >=1b38da264674d6a0fe26a63996b8f88b88c3da48 <a143545855bc2c6e1330f6f57ae375ac44af00a7 | 3f0e0e2d9e752570041e95fd04635e2580097819, dfb5e05227745de43b7fd589721817a4337c970d, eba0c75670c022cb1f948600db972524bcfe8166, fc023b8fab057f0c910856ff36d3e12a30b7af4a, 9f665b3c3d9a168410251f27a5d019b7bf93185c, a143545855bc2c6e1330f6f57ae375ac44af00a7 |
| Linux/Linuxgeneric | 3.16 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
Feb 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
In the Linux kernel, the following vulnerability has been resolved: dmaengine: mmp_pdma: Fix race condition in mmp_pdma_residue() Add proper locking in mmp_pdma_residue() to prevent use-after-free when accessing descriptor list and descriptor contents. The race occurs when multiple threads call tx_status() while the tasklet on another CPU is freeing completed descriptors: CPU 0 CPU 1 ----- ----- mmp_pdma_tx_status() mmp_pdma_residue() -> NO LOCK held list_for_each_entry(sw, ..) DMA interrupt dma_do_tasklet() -> spin_lock(&desc_lock) list_move(sw->node, ...) spin_unlock(&desc_lock) | dma_pool_free(sw) <- FREED! -> access sw->desc <- UAF! This issue can be reproduced when running dmatest on the same channel with multiple threads (threads_per_chan > 1). Fix by protecting the chain_running list iteration and descriptor access with the chan->desc_lock spinlock.
Quoted source text, attributed separately from HOL analysis.