CVE-2026-53185 Details
Description
In the Linux kernel, the following vulnerability has been resolved: zram: fix use-after-free in zram_bvec_write_partial() zram_read_page() picks the sync or async backing device read path based on whether the parent bio is NULL. zram_bvec_write_partial() passes its parent bio down, so for ZRAM_WB slots the read is dispatched asynchronously and zram_read_page() returns 0 while the bio is still in flight. The caller then runs memcpy_from_bvec(), zram_write_page() and __free_page() on the buffer, leaving the async read to write into a freed page. zram_bvec_read_partial() was switched to NULL in commit 4e3c87b9421d ("zram: fix synchronous reads") for the same reason; the write_partial counterpart was missed.
A use-after-free vulnerability has been identified in the ZRAM module of the Linux kernel. This issue arises in the 'zram_bvec_write_partial()' function, where an asynchronous read operation can overwrite data in a memory page that has already been freed. The vulnerability occurs because 'zram_bvec_write_partial()' passes its parent bio information down to the read function, leading to a race condition. While the read operation is still in progress, the function frees the page and writes new data into it, causing a use-after-free scenario.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for upgrading the kernel can be found in the official Linux kernel documentation.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
| CWE-364 | Signal Handler Race Condition | redhat-SADP |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 4.14, < 6.6.143 >= 6.7, < 6.12.94 >= 6.13, < 6.18.36 >= 6.19, < 7.0.13 7.1 rc1 7.1 rc2 7.1 rc3 7.1 rc4 7.1 rc5 7.1 rc6 7.1 rc7 |
CPE
Remediation
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Change History
10 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 9, 2026 | CVE Modified | redhat-SADP |
| Sep 3, 2026 | CVE Modified | redhat-SADP |
| Sep 2, 2026 | CVE Modified | redhat-SADP |
| Aug 26, 2026 | CVE Modified | kernel.org |
| Aug 26, 2026 | CVE Modified | redhat-SADP |
| Jul 15, 2026 | CVE Modified | redhat-SADP |
| Jul 6, 2026 | Initial Analysis | [email protected] |
| Jun 30, 2026 | CVE Modified | redhat-SADP |
| Jun 28, 2026 | CVE Modified | kernel.org |
| Jun 25, 2026 | New CVE Received | kernel.org |