CVE-2024-26832

Summary

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

mm: zswap: fix missing folio cleanup in writeback race path

In zswap_writeback_entry(), after we get a folio from __read_swap_cache_async(), we grab the tree lock again to check that the swap entry was not invalidated and recycled. If it was, we delete the folio we just added to the swap cache and exit.

However, __read_swap_cache_async() returns the folio locked when it is newly allocated, which is always true for this path, and the folio is ref'd. Make sure to unlock and put the folio before returning.

This was discovered by code inspection, probably because this path handles a race condition that should not happen often, and the bug would not crash the system, it will only strand the folio indefinitely.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux2cab13f500a6333bd2b853783ac76be9e4956f8a < 14f1992430ef9e647b02aa8ca12c5bcb9a1dffeaaffected
LinuxLinux04fc7816089c5a32c29a04ec94b998e219dfb946 < 6156277d1b26cb3fdb6fcbf0686ab78268571644affected
LinuxLinux04fc7816089c5a32c29a04ec94b998e219dfb946 < e2891c763aa2cff74dd6b5e978411ccf0cf94abeaffected
LinuxLinux04fc7816089c5a32c29a04ec94b998e219dfb946 < e3b63e966cac0bf78aaa1efede1827a252815a1daffected
LinuxLinuxba700ea13bf0105a4773c654f7d3bef8adb64ab2affected
LinuxLinux6.1.30 < 6.1.80affected
LinuxLinux6.3.4 < 6.4affected
LinuxLinux6.4affected
LinuxLinux0 < 6.4unaffected
LinuxLinux6.1.80 <= 6.1.*unaffected
LinuxLinux6.6.19 <= 6.6.*unaffected
LinuxLinux6.7.7 <= 6.7.*unaffected
LinuxLinux6.8 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References