CVE-2026-93045bpf: Reject arena frees below the arena base
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: bpf: Reject arena frees below the arena base bpf_arena_free_pages() accepts scalar arena addresses. The runtime masks the address to the low 32 bits and reconstructs a full user address from the arena base before returning the range to the arena free tree. When the scalar value is below the low 32 bits of the arena base, full_uaddr falls below user_vm_start. The existing upper-end clipping then turns this into an out-of-range free-tree offset. A later allocation can reuse that offset and return an address below the arena mapping. Reject such frees before computing the clipped range.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 18, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 317460317a02a1af512697e6e964298dedd8a163 builds before 90453eaf8f14e7be0ab03983f2a93aeb6b990a58; from 317460317a02a1af512697e6e964298dedd8a163 before a968dffa5ab3c74d2ebb3a6233bf8b843f0bfc20; 317460317a02a1af512697e6e964298dedd8a163 builds before 8a08635656037aee9c12231ed384449c4ffb1a93; from 317460317a02a1af512697e6e964298dedd8a163 before b5a71cb2db6d84ac0042549dcec266b18429d41e | CNA record |
References
- https://git.kernel.org/stable/c/90453eaf8f14e7be0ab03983f2a93aeb6b990a58
- https://git.kernel.org/stable/c/a968dffa5ab3c74d2ebb3a6233bf8b843f0bfc20
- https://git.kernel.org/stable/c/8a08635656037aee9c12231ed384449c4ffb1a93
- https://git.kernel.org/stable/c/b5a71cb2db6d84ac0042549dcec266b18429d41e
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.