CVE-2026-46234vsock: fix buffer size clamping order
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: vsock: fix buffer size clamping order In vsock_update_buffer_size(), the buffer size was being clamped to the maximum first, and then to the minimum. If a user sets a minimum buffer size larger than the maximum, the minimum check overrides the maximum check, inverting the constraint. This breaks the intended socket memory boundaries by allowing the vsk->buffer_size to grow beyond the configured vsk->buffer_max_size. Fix this by checking the minimum first, and then the maximum. This ensures the buffer size never exceeds the buffer_max_size.
- CVSS
- 7.8 HIGH (v3.1, NVD)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
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 before f6ec135941d2c1c2dbb87b5ce1783f4f6ac6ccca; from b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 before caf11dfea5233a69298a1c448bbf8d1639c80536; from b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 before 01ef69785dc3162f588a361ab770b1e312800188; from b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 before a998a7e250bf976539e05a00ec64a81292afecaa; from b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 before 310da27932dd0afe7ce7456dfe1f0814c3301f41; from b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 before 2602f7bb5818e92315feeaeb71d8ce4d5c9ab160; from b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 before 0b68881501460c3761f196469e1e503218c5e536; from b9f2b0ffde0c9b666b2b1672eb468b8f805a9b97 before d114bfdc9b76bf93b881e195b7ec957c14227bab | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
linux linux_kernel linux:linux_kernel | from 5.5 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.140; from 6.7 before 6.12.90; from 6.13 before 6.18.32; from 6.19 before 7.0.9 | NVD |
References
- https://git.kernel.org/stable/c/f6ec135941d2c1c2dbb87b5ce1783f4f6ac6cccapatch
- https://git.kernel.org/stable/c/caf11dfea5233a69298a1c448bbf8d1639c80536patch
- https://git.kernel.org/stable/c/01ef69785dc3162f588a361ab770b1e312800188patch
- https://git.kernel.org/stable/c/a998a7e250bf976539e05a00ec64a81292afecaapatch
- https://git.kernel.org/stable/c/310da27932dd0afe7ce7456dfe1f0814c3301f41patch
- https://git.kernel.org/stable/c/2602f7bb5818e92315feeaeb71d8ce4d5c9ab160patch
- https://git.kernel.org/stable/c/0b68881501460c3761f196469e1e503218c5e536patch
- https://git.kernel.org/stable/c/d114bfdc9b76bf93b881e195b7ec957c14227babpatch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
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.