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CVE-2026-98587

Linux: firewire: cdev: fix back-transition for iso_resource_auto client resource

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)0.19%Chance of exploitation activity in the next 30 days, higher than 8% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version yet
Published18 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version.

Description

In the Linux kernel, the following vulnerability has been resolved:

firewire: cdev: fix back-transition for iso_resource_auto client resource

The todo member of iso_resource_auto structure represents the state of the client resource and normally transitions in the following order:

ISO_RES_AUTO_ALLOC -> ISO_RES_AUTO_REALLOC -> ISO_RES_AUTO_DEALLOC

However, concurrent access from the work item and the file descriptor release function can cause the state to transition backwards from ISO_RES_AUTO_DEALLOC to ISO_RES_AUTO_REALLOC.

Prevent the back-transition by checking the current state before updating it in the work item.

Text from CVE List

Affected versions 6

  • Linuxaffected: fcabbf40fae501379b4f3a057febe92d4b0ebdd8 before ee1df60a0d0e8ab4b00137135733bdadd6d33dabCVE List
  • Linuxaffected: fcabbf40fae501379b4f3a057febe92d4b0ebdd8 before c6b51091cafff9ce6c03c1416aa13864d17ab97cCVE List
  • Linuxaffected: 7.2CVE List
  • Linuxunaffected: all versions before 7.2CVE List
  • Linuxunaffected: 7.2.9 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 2