{"id":"CVE-2026-53185","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-53185","summary":"zram: fix use-after-free in zram_bvec_write_partial()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nzram: fix use-after-free in zram_bvec_write_partial()\n\nzram_read_page() picks the sync or async backing device read path based on\nwhether the parent bio is NULL.  zram_bvec_write_partial() passes its\nparent bio down, so for ZRAM_WB slots the read is dispatched\nasynchronously and zram_read_page() returns 0 while the bio is still in\nflight.  The caller then runs memcpy_from_bvec(), zram_write_page() and\n__free_page() on the buffer, leaving the async read to write into a freed\npage.\n\nzram_bvec_read_partial() was switched to NULL in commit 4e3c87b9421d\n(\"zram: fix synchronous reads\") for the same reason; the write_partial\ncounterpart was missed.","published":"2026-06-25T08:38:58.853Z","modified":"2026-08-26T18:27:39.362143018Z","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.00095,"percentile":0.0079,"asOf":"2026-08-07"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.6.143"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0c2821665ff71be3f4b07ecece384669f2877f6a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/198b5a14cca27263b9c14b20114c8092de15dfcb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/732fd9f0b9c1cdc6dfd77162ded60df005182cc0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/77a602b505ce4802915853cfc435a4722fab3e64"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c96786d6ff1acc1d54d9241e97767554c1dfdd5b"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53185.json"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-53185"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53185.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53185"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2492735"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-26T18:27:39.362143018Z"}}