CVE-2024-41042: netfilter: nf_tables: prefer nft_chain_validate
First published: Mon Jul 29 2024(Updated: )
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).
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.9.10 | 6.9.10 |
| redhat/kernel | <6.10 | 6.10 |
| debian/linux | <=5.10.223-1 | 5.10.226-1 6.1.115-1 6.1.112-1 6.11.7-1 6.11.9-1 |
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Reference Links
- https://git.kernel.org/stable/c/1947e4c3346faa8ac7e343652c0fd3b3e394202f
- https://git.kernel.org/stable/c/31c35f9f89ef585f1edb53e17ac73a0ca4a9712b
- https://git.kernel.org/stable/c/717c91c6ed73e248de6a15bc53adefb81446c9d0
- https://git.kernel.org/stable/c/8246b7466c8da49d0d9e85e26cbd69dd6d3e3d1e
- https://git.kernel.org/stable/c/9df785aeb7dcc8efd1d4110bb27d26005298ebae
- https://git.kernel.org/stable/c/b6b6e430470e1c3c5513311cb35a15a205595abe
- https://git.kernel.org/stable/c/cd4348e0a50286282c314ad6d2b0740e7c812c24
- https://git.kernel.org/stable/c/cff3bd012a9512ac5ed858d38e6ed65f6391008c
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-41042
- https://nvd.nist.gov/vuln/detail/CVE-2024-41042
- https://launchpad.net/bugs/cve/CVE-2024-41042
- https://security-tracker.debian.org/tracker/CVE-2024-41042
- https://ubuntu.com/security/CVE-2024-41042
- https://git.kernel.org/linus/cff3bd012a9512ac5ed858d38e6ed65f6391008c
- https://lore.kernel.org/linux-cve-announce/2024072924-CVE-2024-41042-c338@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2301570
- https://access.redhat.com/errata/RHSA-2024:8870
- https://access.redhat.com/errata/RHSA-2024:8856
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2300412
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