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CVE-2026-97436

Unknown

Last modified

CVE-2026-97436 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: dpaa2-switch: rework FDB management on the bridge leave path On bridge leave, the dpaa2_switch_port_set_fdb() function always allocates a new FDB for the port which is becoming standalone. In case no FDB is found, then the port leaving a bridge will continue to use the current one. The above logic does not cover the case in which there are multiple bridges which have ports from the same DPSW instance.

Description

In the Linux kernel, the following vulnerability has been resolved: dpaa2-switch: rework FDB management on the bridge leave path On bridge leave, the dpaa2_switch_port_set_fdb() function always allocates a new FDB for the port which is becoming standalone. In case no FDB is found, then the port leaving a bridge will continue to use the current one. The above logic does not cover the case in which there are multiple bridges which have ports from the same DPSW instance. In this case, when the last port leaves bridge #1, it finds an unused FDB to switch to, but the old FDB is not marked as unused. Since the number of FDBs is equal to the number of DPSW interfaces, this will eventually lead to multiple ports sharing the same FDB. Fix this by changing how we are managing the FDBs on the leave path. Instead of directly allocating a new FDB, first verify if the current port is the last one to leave a bridge. If this is the case, then continue to use the current FDB and only allocate another FDB if there are other ports remaining in the bridge.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 539dda3c5d190c5088b5e57944b1b482fcb464de, < abea361a11e4e48695ea149652ef5d3f308b6a49; >= 539dda3c5d190c5088b5e57944b1b482fcb464de, < 5adbc4d02d7df8bd7aa02c21874f7a582a576b55; >= 539dda3c5d190c5088b5e57944b1b482fcb464de, < efc1d92eacf03afa6f4d53bf7120e059b6f961f2
LinuxLinux5.13

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-97436?
In the Linux kernel, the following vulnerability has been resolved: dpaa2-switch: rework FDB management on the bridge leave path On bridge leave, the dpaa2_switch_port_set_fdb() function always allocates a new FDB for the port which is becoming standalone. In case no FDB is found, then the port leaving a bridge will continue to use the current one. The above logic does not cover the case in which there are multiple bridges which have ports from the same DPSW instance. In this case, when the last port leaves bridge #1, it finds an unused FDB to switch to, but the old FDB is not marked as unused. Since the number of FDBs is equal to the number of DPSW interfaces, this will eventually lead to multiple ports sharing the same FDB. Fix this by changing how we are managing the FDBs on the leave path. Instead of directly allocating a new FDB, first verify if the current port is the last one to leave a bridge. If this is the case, then continue to use the current FDB and only allocate another FDB if there are other ports remaining in the bridge.
How severe is CVE-2026-97436?
Severity scoring for CVE-2026-97436 is pending analysis.
How do I fix CVE-2026-97436?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST