CVE-2026-53185 (GCVE-0-2026-53185)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:38 – Updated: 2026-07-02 12:05
VLAI
Title
zram: fix use-after-free in zram_bvec_write_partial()
Summary
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-364 - Signal Handler Race Condition
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8e654f8fbff52ac483fb69957222853d7e2fc588 , < 0c2821665ff71be3f4b07ecece384669f2877f6a (git)
Affected: 8e654f8fbff52ac483fb69957222853d7e2fc588 , < 77a602b505ce4802915853cfc435a4722fab3e64 (git)
Affected: 8e654f8fbff52ac483fb69957222853d7e2fc588 , < c96786d6ff1acc1d54d9241e97767554c1dfdd5b (git)
Affected: 8e654f8fbff52ac483fb69957222853d7e2fc588 , < 198b5a14cca27263b9c14b20114c8092de15dfcb (git)
Affected: 8e654f8fbff52ac483fb69957222853d7e2fc588 , < 732fd9f0b9c1cdc6dfd77162ded60df005182cc0 (git)
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Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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