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Vulnerability record · CVE-2026-53185 · published 25 June 2026

CVE-2026-53185: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.11% · top 99.0% CWE-416 · Use after freeCWE-364 · CWE-364
7.8CVSS 3.1 base score
0.11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
13References
9 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0c2821665ff71be3f4b07ecece384669f2877f6a Patch
https://git.kernel.org/stable/c/198b5a14cca27263b9c14b20114c8092de15dfcb Patch
https://git.kernel.org/stable/c/732fd9f0b9c1cdc6dfd77162ded60df005182cc0 Patch
https://git.kernel.org/stable/c/77a602b505ce4802915853cfc435a4722fab3e64 Patch
https://git.kernel.org/stable/c/c96786d6ff1acc1d54d9241e97767554c1dfdd5b Patch
https://access.redhat.com/errata/RHSA-2026:59723
https://access.redhat.com/errata/RHSA-2026:61887
https://access.redhat.com/errata/RHSA-2026:63013
https://access.redhat.com/errata/RHSA-2026:63014
https://access.redhat.com/errata/RHSA-2026:65708
https://access.redhat.com/security/cve/CVE-2026-53185 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2492735 Issue TrackingThird Party Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53185.json Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-53185), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.