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CVE-2026-97436

Linux: dpaa2-switch: rework FDB management on the bridge leave path

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.17%Chance of exploitation activity in the next 30 days, higher than 6% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in5adbc4d02d7df8bd7aa02c21874f7a582a576b55Fixed versionCVE List
Published24 Sep 2026Updated 3 Oct 2026CVE List

What fixes it

  • 5adbc4d02d7df8bd7aa02c21874f7a582a576b55LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 14

  • Linuxaffected: 539dda3c5d190c5088b5e57944b1b482fcb464de before ec41bfd281a8bc8027a42d2674eac5b74947ff7aCVE List
  • Linuxaffected: 539dda3c5d190c5088b5e57944b1b482fcb464de before e07ff2338f45adbf572850335d761c2f97545935CVE List
  • Linuxaffected: 539dda3c5d190c5088b5e57944b1b482fcb464de before dc626f2abb3052881911b6166a9425739ce80085CVE List
  • Linuxaffected: 539dda3c5d190c5088b5e57944b1b482fcb464de before abea361a11e4e48695ea149652ef5d3f308b6a49CVE List
  • Linuxaffected: 539dda3c5d190c5088b5e57944b1b482fcb464de before 5adbc4d02d7df8bd7aa02c21874f7a582a576b55CVE List
  • Linuxaffected: 539dda3c5d190c5088b5e57944b1b482fcb464de before efc1d92eacf03afa6f4d53bf7120e059b6f961f2CVE List
  • Linuxaffected: 5.13CVE List
  • Linuxunaffected: all versions before 5.13CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.111 through 6.12.*CVE List
  • Linuxunaffected: 6.18.53 through 6.18.*CVE List
  • Linuxunaffected: 7.2CVE List

References 6