Alma Linux: CVE-2024-41042: Moderate: kernel security update (Multiple Advisories)

Alma Linux: CVE-2024-41042: Moderate: kernel security update (Multiple Advisories)

Severity

4

CVSS

(AV:L/AC:M/Au:N/C:P/I:P/A:P)

Published

07/29/2024

Created

11/08/2024

Added

11/07/2024

Modified

11/07/2024

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)

• alma-upgrade-bpftool
• alma-upgrade-kernel
• alma-upgrade-kernel-abi-stablelists
• alma-upgrade-kernel-core
• alma-upgrade-kernel-cross-headers
• alma-upgrade-kernel-debug
• alma-upgrade-kernel-debug-core
• alma-upgrade-kernel-debug-devel
• alma-upgrade-kernel-debug-modules
• alma-upgrade-kernel-debug-modules-extra
• alma-upgrade-kernel-devel
• alma-upgrade-kernel-doc
• alma-upgrade-kernel-headers
• alma-upgrade-kernel-modules
• alma-upgrade-kernel-modules-extra
• alma-upgrade-kernel-rt
• alma-upgrade-kernel-rt-core
• alma-upgrade-kernel-rt-debug
• alma-upgrade-kernel-rt-debug-core
• alma-upgrade-kernel-rt-debug-devel
• alma-upgrade-kernel-rt-debug-modules
• alma-upgrade-kernel-rt-debug-modules-extra
• alma-upgrade-kernel-rt-devel
• alma-upgrade-kernel-rt-modules
• alma-upgrade-kernel-rt-modules-extra
• alma-upgrade-kernel-tools
• alma-upgrade-kernel-tools-libs
• alma-upgrade-kernel-tools-libs-devel
• alma-upgrade-kernel-zfcpdump
• alma-upgrade-kernel-zfcpdump-core
• alma-upgrade-kernel-zfcpdump-devel
• alma-upgrade-kernel-zfcpdump-modules
• alma-upgrade-kernel-zfcpdump-modules-extra
• alma-upgrade-perf
• alma-upgrade-python3-perf

References

• https://attackerkb.com/topics/cve-2024-41042
• CVE - 2024-41042
• https://errata.almalinux.org/8/ALSA-2024-8856.html
• https://errata.almalinux.org/8/ALSA-2024-8870.html