CVE-2026-53185
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.…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.11%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.11% probability · 1th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416, CWE-364
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0c2821665ff71be3f4b07ecece384669f2877f6aPatch
- https://git.kernel.org/stable/c/198b5a14cca27263b9c14b20114c8092de15dfcbPatch
- https://git.kernel.org/stable/c/732fd9f0b9c1cdc6dfd77162ded60df005182cc0Patch
- https://git.kernel.org/stable/c/77a602b505ce4802915853cfc435a4722fab3e64Patch
- https://git.kernel.org/stable/c/c96786d6ff1acc1d54d9241e97767554c1dfdd5bPatch
- 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-2026-53185Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2492735Issue Tracking, Third Party Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53185.jsonThird Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.