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CVE-2026-53294— mailbox: mailbox-test: don't free the reused channel

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.

Linux kernel是美国Linux基金会开源的操作系统Linux所使用的内核。 Linux kernel 4.4版本存在安全漏洞，该漏洞源于mailbox-test驱动中处理RX通道别名TX通道时释放重复通道，可能导致双重释放。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 8ea4484d0c2bb4e2152261943fa1a3522654b1c7< fc0089f82c3e36060c2c79156bc2018bfb16b56b affected
8ea4484d0c2bb4e2152261943fa1a3522654b1c7< 5d4f3d0f64f1016cb78b400a70b67df91fac99b5 affected
8ea4484d0c2bb4e2152261943fa1a3522654b1c7< c494a11da45ad7ec9b0ff216c3e3ace351193bb6 affected
8ea4484d0c2bb4e2152261943fa1a3522654b1c7< 3afca89fae501dbd7421e1777b5b8f033b1d98d0 affected
8ea4484d0c2bb4e2152261943fa1a3522654b1c7< 5c209299b0113e289e238fa5f2e8f00c59f76060 affected
8ea4484d0c2bb4e2152261943fa1a3522654b1c7< 82f6dcea46cf5de65c4ba7283f7c7b34de4a324d affected
8ea4484d0c2bb4e2152261943fa1a3522654b1c7< 240c71a2aea36a1a4210f911a1c32ea88777e8e4 affected
8ea4484d0c2bb4e2152261943fa1a3522654b1c7< 88ebadbf0deefdaccdab868b44ff70a0a257f473 affected
… +10 more rows
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I. Basic Information for CVE-2026-53294

Vulnerability Information
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Vulnerability Title
mailbox: mailbox-test: don't free the reused channel
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mailbox: mailbox-test: don't free the reused channel The RX channel can be aliased to the TX channel if it has a different MMIO. This special case needs to be handled when freeing the channels otherwise a double-free occurs.
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的操作系统Linux所使用的内核。 Linux kernel 4.4版本存在安全漏洞，该漏洞源于mailbox-test驱动中处理RX通道别名TX通道时释放重复通道，可能导致双重释放。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 8ea4484d0c2bb4e2152261943fa1a3522654b1c7 ~ fc0089f82c3e36060c2c79156bc2018bfb16b56b -
Linux Linux 4.4 -

II. Public POCs for CVE-2026-53294

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III. Intelligence Information for CVE-2026-53294

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Patches & Fixes for CVE-2026-53294 (8)

Same Patch Batch · Linux · 2026-06-26 · 47 CVEs total

CVE-2026-53309 9.8 CRITICAL ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison
CVE-2026-53281 8.8 HIGH iommu/vt-d: Avoid NULL pointer dereference or refcount corruption
CVE-2026-53322 8.8 HIGH vfio/pci: Clean up DMABUFs before disabling function
CVE-2026-53300 7.8 HIGH net: enetc: fix NTMP DMA use-after-free issue
CVE-2026-53290 7.8 HIGH drm/xe/eustall: Fix drm_dev_put called before stream disable in close
CVE-2026-53284 7.5 HIGH btrfs: only release the dirty pages io tree after successful writes
CVE-2026-53324 net: mana: Use pci_name() for debugfs directory naming
CVE-2026-53306 tty: hvc_iucv: fix off-by-one in number of supported devices
CVE-2026-53319 blk-wbt: remove WARN_ON_ONCE from wbt_init_enable_default()
CVE-2026-53321 io_uring/napi: cap busy_poll_to 10 msec
CVE-2026-53320 nilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()
CVE-2026-53323 net: dsa: remove redundant netdev_lock_ops() from conduit ethtool ops
CVE-2026-53313 drm/amd/display: Avoid NULL dereference in dc_dmub_srv error paths
CVE-2026-53312 iommu/riscv: Remove overflows on the invalidation path
CVE-2026-53311 fuse: fix uninit-value in fuse_dentry_revalidate()
CVE-2026-53310 soc/tegra: cbb: Fix cross-fabric target timeout lookup
CVE-2026-53308 power: supply: max77705: Free allocated workqueue and fix removal order
CVE-2026-53307 pinctrl: pinconf-generic: Fully validate 'pinmux' property
CVE-2026-53305 usb: typec: ps883x: Fix Oops at unbind
CVE-2026-53303 f2fs: protect extension_list reading with sb_lock in f2fs_sbi_show()

Showing top 20 of 47 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53294

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