Vulnerability details
CVE-2026-53185
zram: fix use-after-free in zram_bvec_write_partial()
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.8High | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 7.0High | 3.1 | CVEProject cvelistV5 (CNA) (redhat-SADP) | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linux | Linux | 4.14 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8e654f8fbff52ac483fb69957222853d7e2fc588 ≤ v < 77a602b505ce4802915853cfc435a4722fab3e64 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8e654f8fbff52ac483fb69957222853d7e2fc588 ≤ v < c96786d6ff1acc1d54d9241e97767554c1dfdd5b | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8e654f8fbff52ac483fb69957222853d7e2fc588 ≤ v < 0c2821665ff71be3f4b07ecece384669f2877f6a | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8e654f8fbff52ac483fb69957222853d7e2fc588 ≤ v < 732fd9f0b9c1cdc6dfd77162ded60df005182cc0 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8e654f8fbff52ac483fb69957222853d7e2fc588 ≤ v < 198b5a14cca27263b9c14b20114c8092de15dfcb | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Enterprise Linux 9 | All | CVEProject cvelistV5 (CNA) |
References and advisories
13- https://git.kernel.org/stable/c/0c2821665ff71be3f4b07ecece384669f2877f6a
- https://git.kernel.org/stable/c/77a602b505ce4802915853cfc435a4722fab3e64
- https://git.kernel.org/stable/c/c96786d6ff1acc1d54d9241e97767554c1dfdd5b
- https://git.kernel.org/stable/c/198b5a14cca27263b9c14b20114c8092de15dfcb
- https://git.kernel.org/stable/c/732fd9f0b9c1cdc6dfd77162ded60df005182cc0
- https://access.redhat.com/security/cve/CVE-2026-53185 vdb-entryx_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2492735 issue-trackingx_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53185.json x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:61887 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:65708 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:59723 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:63014 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:63013 vendor-advisoryx_refsource_REDHAT
Details
- Published
- 2026-06-25
- Last updated
- 2026-10-19
- State
- Published
- Assigner (CNA)
- Linux
Exploit prediction (EPSS)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-364Signal Handler Race Condition