CVE-2026-90043
- Source
- https://cve.org/CVERecord?id=CVE-2026-90043
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90043.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-90043
- Downstream
- Published
- 2026-09-16T10:33:40Z
- Modified
- 2026-09-18T03:48:34Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- zram: fix slot lock bit position on big-endian 64-bit
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
zram: fix slot lock bit position on big-endian 64-bit
The slot lock is a bit operation on the whole __lock word, which flags and ac_time alias as two u32s. On little-endian the lock bit lands in the position ZRAM_ENTRY_LOCK reserves in flags, so the aliasing works out. On 64-bit big-endian it lands in ac_time instead: with ZRAM_TRACK_ENTRY_ACTIME enabled, storing the access time from mark_slot_accessed() or slot_free() wipes out the held lock bit, letting another CPU take the same slot lock; an access time value with that bit set makes the slot look locked forever.
Shift the lock bit into the flags half of the word on big-endian 64-bit.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90043.json" }- References
-
- https://git.kernel.org/stable/c/052b6b2d5fe97547bd2cdb73fa894f6cfea68b11
- https://git.kernel.org/stable/c/a8b5875741d416703e19ad8eeac6fce8a12bd6e4
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90043.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-90043
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git