CVE-2024-26884

Summary

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

bpf: Fix hashtab overflow check on 32-bit arches

The hashtab code relies on roundup_pow_of_two() to compute the number of hash buckets, and contains an overflow check by checking if the resulting value is 0. However, on 32-bit arches, the roundup code itself can overflow by doing a 32-bit left-shift of an unsigned long value, which is undefined behaviour, so it is not guaranteed to truncate neatly. This was triggered by syzbot on the DEVMAP_HASH type, which contains the same check, copied from the hashtab code. So apply the same fix to hashtab, by moving the overflow check to before the roundup.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxdaaf427c6ab392bedcd018e326b2ffa1e1110cd6 < 33ec04cadb77605b71d9298311919303d390c4d5affected
LinuxLinuxdaaf427c6ab392bedcd018e326b2ffa1e1110cd6 < 92c81fbb3ed2e0dfc33a4183a67135e1ab566aceaffected
LinuxLinuxdaaf427c6ab392bedcd018e326b2ffa1e1110cd6 < 64f00b4df0597590b199b62a37a165473bf658a6affected
LinuxLinuxdaaf427c6ab392bedcd018e326b2ffa1e1110cd6 < 3b08cfc65f07b1132c1979d73f014ae6e04de55daffected
LinuxLinuxdaaf427c6ab392bedcd018e326b2ffa1e1110cd6 < a83fdaeaea3677b83a53f72ace2d73a19bcd6d93affected
LinuxLinuxdaaf427c6ab392bedcd018e326b2ffa1e1110cd6 < 8435f0961bf3dc65e204094349bd9aeaac1f8868affected
LinuxLinuxdaaf427c6ab392bedcd018e326b2ffa1e1110cd6 < d817f0d34d927f2deb17dadbfe212c9a6a32ac3eaffected
LinuxLinuxdaaf427c6ab392bedcd018e326b2ffa1e1110cd6 < a6fa75b5096c0f9826a4fabe22d907b0a5bb1016affected
LinuxLinuxdaaf427c6ab392bedcd018e326b2ffa1e1110cd6 < 6787d916c2cf9850c97a0a3f73e08c43e7d973b1affected
LinuxLinux3.19affected
LinuxLinux0 < 3.19unaffected
LinuxLinux4.19.311 <= 4.19.*unaffected
LinuxLinux5.4.273 <= 5.4.*unaffected
LinuxLinux5.10.214 <= 5.10.*unaffected
LinuxLinux5.15.153 <= 5.15.*unaffected
LinuxLinux6.1.83 <= 6.1.*unaffected
LinuxLinux6.6.23 <= 6.6.*unaffected
LinuxLinux6.7.11 <= 6.7.*unaffected
LinuxLinux6.8.2 <= 6.8.*unaffected
LinuxLinux6.9 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

Additional References

References