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CVE-2026-80556— mmc: atmel-mci: Fix use-after-free in atmci_remove due to race condition

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

以下是该 Linux 内核漏洞描述的中文翻译： 在 Linux 内核中，已修复以下漏洞： MMC: atmel-mci：修复 atmci_remove 中由竞态条件导致的 use-after-free（释放后使用）问题 在 函数中， 与 绑定在一起，并且 、 和 都可以通过 队列调度此工作项。 当我们移除模块时， 执行清理操作。由于 内存是通过 分配的，其内存会在 回调返回后由 devm 机制自动释放，但上述提到的工作项可能仍处于待处理或正在执行状态。以下操作序列可能导致 use-after-free（UAF）缺陷

AI Predicted 5.5 Difficulty: Hard

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 7d2be0749a59096a334c94dc48f43294193cb8ed< 22aecf6c4721727a2f724ca0438bc7d4b609bf3f affected
7d2be0749a59096a334c94dc48f43294193cb8ed< b5060ff2f5460795a3e9f7cdf5052aa42f96ff81 affected
7d2be0749a59096a334c94dc48f43294193cb8ed< 7599a73ff66d195a908f5d88b427933a9fb1c02a affected
7d2be0749a59096a334c94dc48f43294193cb8ed< c125ee35a49a0518521b52b27631eef061b8719a affected
2.6.27 affected
< 2.6.27 unaffected
6.12.105≤ 6.12.* unaffected
6.18.46≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-80556

Vulnerability Information
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Vulnerability Title
mmc: atmel-mci: Fix use-after-free in atmci_remove due to race condition
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mmc: atmel-mci: Fix use-after-free in atmci_remove due to race condition In atmci_probe, &host->bh_work is bound with atmci_work_func, and atmci_interrupt, atmci_timeout_timer and atmci_dma_complete can all queue this work on system_bh_wq. If we remove the module, atmci_remove makes cleanup and the memory allocated for host with devm_kzalloc() is released after the remove callback returns, while the work mentioned above may still be pending or running. The sequence of operations that may lead to a UAF bug is as follows: CPU0 CPU1 | atmci_interrupt | queue_work(system_bh_wq, | &host->bh_work) atmci_remove | atmci_cleanup_slot(...) | atmci_writel(host, ATMCI_IDR, ~0UL) | timer_delete_sync(&host->timer) | dma_release_channel(host->dma.chan) | free_irq(platform_get_irq(pdev, 0), host) | | atmci_work_func | // use host // devm resources released after | // remove returns, host is freed | | // use host (use-after-free) Fix it by canceling the work after all the sources that can schedule it (IRQ handler, timeout timer and DMA completion callback) have been stopped, and before proceeding with the remaining cleanup in atmci_remove.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 7d2be0749a59096a334c94dc48f43294193cb8ed ~ 22aecf6c4721727a2f724ca0438bc7d4b609bf3f -
Linux Linux 2.6.27 -

II. Public POCs for CVE-2026-80556

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III. Intelligence Information for CVE-2026-80556

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Patches & Fixes for CVE-2026-80556 (4)

Same Patch Batch · Linux · 2026-08-26 · 92 CVEs total

CVE-2026-80557 libceph: fix OOB read in decode_watchers() via missing bounds check
CVE-2026-80553 s390/vfio_ccw: Cancel existing workqueues
CVE-2026-80552 s390/vfio_ccw: Ensure index for read/write regions are within range
CVE-2026-80549 s390/vfio_ccw: Move cp cleanup out of not operational
CVE-2026-80546 s390/zcrypt: Improve CCA CPRB length and overflow checks
CVE-2026-80547 s390/vfio_ccw: Implement a crw lock
CVE-2026-80545 s390/zcrypt: Improve EP11 CPRB length and overflow checks
CVE-2026-80543 s390/zcrypt: Pad trailing CCA or EP11 message with zeros
CVE-2026-80548 s390/vfio_ccw: Selectively expand io_mutex
CVE-2026-80555 s390/vfio_ccw: Free all memory if cp_init() fails
CVE-2026-80554 s390/vfio_ccw: Limit the number of channel program segments
CVE-2026-80559 Input: sur40 - fix input device registration ordering
CVE-2026-80558 libceph: Avoid using invalid osd indices from primary_temp
CVE-2026-80560 openrisc: signal: do not restore privileged SR bits on sigreturn
CVE-2026-80561 libceph: fix multiple unsafe decodes in decode_locker()
CVE-2026-80562 gpio: ml-ioh: use raw_spinlock_t for the register lock
CVE-2026-80563 gpio: sloppy-logic-analyzer: fix use-after-free via debugfs trigger on unbind
CVE-2026-80564 gve: fix NULL dereference due to missing ptp adjfine
CVE-2026-80565 crypto: qce - fix error path in devm_qce_register_algs
CVE-2026-80566 Input: hynitron_cstxxx - validate touch count and finger IDs

Showing top 20 of 92 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80556

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