Last Modified: May 21, 2026
Affected Product(s):
BIG-IP Install/Upgrade, TMOS
Known Affected Versions:
17.5.1.6
Opened: May 15, 2026 Severity: 1-Blocking Related Article:
K000161170
1. When upgrading to BIG-IP v17.5.1.6 and an Engineering Hotfix that includes the fix for ID2291757, systems other than iSeries appliances will fail to boot into the new boot location. This affects F5OS tenants, vCMP guests (including on iSeries appliances), VIPRIONs, and all other hardware platforms. BIG-IP Virtual Editions may also be affected, depending on their disk partition layout (which varies by deployment history and cannot be reliably predicted without inspecting the filesystem). When this occurs, the system hangs during early boot. An error similar to the following may be seen at the console: [ 3.201968] systemd-fsck[1230]: set.2./var: clean, 10131/294912 files, 148631/1179648 blocks [FAILED] Failed to mount Mount TMOS 'share' filesystem. See 'systemctl status shared.mount' for details. 2. Upgrading an iSeries appliance to BIG-IP v17.5.1.6 (or an Engineering Hotfix that does not include a fix for ID2291757) results in degraded operation: the system boots, but SSH is unavailable. The system may be partially accessible via GUI or console. These issues stem from insufficient space on the /usr filesystem during the upgrade. For background, see K000161170. The fix for ID2291757 addressed the /usr space issue for iSeries appliances, but introduced a boot failure when applied to other platforms. The fix for ID2296269 resolves this regression.
- Non-iSeries platforms: The system fails to boot and is inaccessible. Recovery requires accessing the console of the system and booting into the previous boot location. - Bare-metal iSeries appliances (without FIPS HSM): The system boots but operates in a degraded state. SSH is unavailable and the configuration may not fully load, but GUI and console access are still available.
1. Upgrading any platform other than an iSeries appliance to a BIG-IP v17.5.1.6 Engineering Hotfix that includes the fix for ID2291757. This affects vCMP guests on iSeries appliances. 2. Upgrading an iSeries appliance to the base BIG-IP v17.5.1.6 release, or to an Engineering Hotfix that does not include the fix for ID2291757.
Select the appropriate path based on your platform: - F5OS tenants, vCMP guests, VIPRIONs, Virtual Editions, and other non-iSeries platforms: Obtain an Engineering Hotfix that includes the fix for ID2296269. - Bare-metal iSeries appliances (without onboard FIPS HSM): Obtain an Engineering Hotfix that includes the fix for either ID2296269 or ID2291757. - iSeries appliances with onboard FIPS HSM: Engineering Hotfixes are not applicable. Follow the manual workaround (Option B) in K000161170. For more details, see https://my.f5.com/manage/s/article/K000161170
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