CVE-2024-41042

Summary

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

netfilter: nf_tables: prefer nft_chain_validate

nft_chain_validate already performs loop detection because a cycle will result in a call stack overflow (ctx->level >= NFT_JUMP_STACK_SIZE).

It also follows maps via ->validate callback in nft_lookup, so there appears no reason to iterate the maps again.

nf_tables_check_loops() and all its helper functions can be removed. This improves ruleset load time significantly, from 23s down to 12s.

This also fixes a crash bug. Old loop detection code can result in unbounded recursion:

BUG: TASK stack guard page was hit at …. Oops: stack guard page: 0000 [#1] PREEMPT SMP KASAN CPU: 4 PID: 1539 Comm: nft Not tainted 6.10.0-rc5+ #1 [..]

with a suitable ruleset during validation of register stores.

I can't see any actual reason to attempt to check for this from nft_validate_register_store(), at this point the transaction is still in progress, so we don't have a full picture of the rule graph.

For nf-next it might make sense to either remove it or make this depend on table->validate_state in case we could catch an error earlier (for improved error reporting to userspace).

Affected Software

VendorProductVersion RangeStatus
LinuxLinux20a69341f2d00cd042e81c82289fba8a13c05a25 < 1947e4c3346faa8ac7e343652c0fd3b3e394202faffected
LinuxLinux20a69341f2d00cd042e81c82289fba8a13c05a25 < cd4348e0a50286282c314ad6d2b0740e7c812c24affected
LinuxLinux20a69341f2d00cd042e81c82289fba8a13c05a25 < 31c35f9f89ef585f1edb53e17ac73a0ca4a9712baffected
LinuxLinux20a69341f2d00cd042e81c82289fba8a13c05a25 < 8246b7466c8da49d0d9e85e26cbd69dd6d3e3d1eaffected
LinuxLinux20a69341f2d00cd042e81c82289fba8a13c05a25 < b6b6e430470e1c3c5513311cb35a15a205595abeaffected
LinuxLinux20a69341f2d00cd042e81c82289fba8a13c05a25 < 717c91c6ed73e248de6a15bc53adefb81446c9d0affected
LinuxLinux20a69341f2d00cd042e81c82289fba8a13c05a25 < 9df785aeb7dcc8efd1d4110bb27d26005298ebaeaffected
LinuxLinux20a69341f2d00cd042e81c82289fba8a13c05a25 < cff3bd012a9512ac5ed858d38e6ed65f6391008caffected
LinuxLinux3.13affected
LinuxLinux0 < 3.13unaffected
LinuxLinux4.19.320 <= 4.19.*unaffected
LinuxLinux5.4.282 <= 5.4.*unaffected
LinuxLinux5.10.224 <= 5.10.*unaffected
LinuxLinux5.15.165 <= 5.15.*unaffected
LinuxLinux6.1.105 <= 6.1.*unaffected
LinuxLinux6.6.46 <= 6.6.*unaffected
LinuxLinux6.9.10 <= 6.9.*unaffected
LinuxLinux6.10 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

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

References