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Red Hat: CVE-2024-41042: kernel: netfilter: nf_tables: prefer nft_chain_validate (Multiple Advisories)

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Red Hat: CVE-2024-41042: kernel: netfilter: nf_tables: prefer nft_chain_validate (Multiple Advisories)

Severity
4
CVSS
(AV:L/AC:H/Au:M/C:N/I:N/A:C)
Published
07/29/2024
Created
11/07/2024
Added
11/06/2024
Modified
12/05/2024

Description

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).

Solution(s)

  • redhat-upgrade-kernel
  • redhat-upgrade-kernel-rt

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