Out-of-bounds Write Affecting kernel-modules-core package, versions <0:5.14.0-284.62.1.el9_2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL9-KERNELMODULESCORE-6620799
- published18 Apr 2024
- disclosed22 Feb 2024
Introduced: 22 Feb 2024
CVE-2024-26586 (opens in a new tab)How to fix?
Upgrade RHEL:9 kernel-modules-core to version 0:5.14.0-284.62.1.el9_2 or higher.
This issue was patched in RHSA-2024:1881.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-modules-core package and not the kernel-modules-core package as distributed by RHEL.
See How to fix? for RHEL:9 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
mlxsw: spectrum_acl_tcam: Fix stack corruption
When tc filters are first added to a net device, the corresponding local port gets bound to an ACL group in the device. The group contains a list of ACLs. In turn, each ACL points to a different TCAM region where the filters are stored. During forwarding, the ACLs are sequentially evaluated until a match is found.
One reason to place filters in different regions is when they are added with decreasing priorities and in an alternating order so that two consecutive filters can never fit in the same region because of their key usage.
In Spectrum-2 and newer ASICs the firmware started to report that the maximum number of ACLs in a group is more than 16, but the layout of the register that configures ACL groups (PAGT) was not updated to account for that. It is therefore possible to hit stack corruption [1] in the rare case where more than 16 ACLs in a group are required.
Fix by limiting the maximum ACL group size to the minimum between what the firmware reports and the maximum ACLs that fit in the PAGT register.
Add a test case to make sure the machine does not crash when this condition is hit.
[1] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: mlxsw_sp_acl_tcam_group_update+0x116/0x120 [...] dump_stack_lvl+0x36/0x50 panic+0x305/0x330 __stack_chk_fail+0x15/0x20 mlxsw_sp_acl_tcam_group_update+0x116/0x120 mlxsw_sp_acl_tcam_group_region_attach+0x69/0x110 mlxsw_sp_acl_tcam_vchunk_get+0x492/0xa20 mlxsw_sp_acl_tcam_ventry_add+0x25/0xe0 mlxsw_sp_acl_rule_add+0x47/0x240 mlxsw_sp_flower_replace+0x1a9/0x1d0 tc_setup_cb_add+0xdc/0x1c0 fl_hw_replace_filter+0x146/0x1f0 fl_change+0xc17/0x1360 tc_new_tfilter+0x472/0xb90 rtnetlink_rcv_msg+0x313/0x3b0 netlink_rcv_skb+0x58/0x100 netlink_unicast+0x244/0x390 netlink_sendmsg+0x1e4/0x440 ____sys_sendmsg+0x164/0x260 ___sys_sendmsg+0x9a/0xe0 __sys_sendmsg+0x7a/0xc0 do_syscall_64+0x40/0xe0 entry_SYSCALL_64_after_hwframe+0x63/0x6b
References
- https://access.redhat.com/security/cve/CVE-2024-26586
- https://git.kernel.org/stable/c/2f5e1565740490706332c06f36211d4ce0f88e62
- https://git.kernel.org/stable/c/348112522a35527c5bcba933b9fefb40a4f44f15
- https://git.kernel.org/stable/c/483ae90d8f976f8339cf81066312e1329f2d3706
- https://git.kernel.org/stable/c/56750ea5d15426b5f307554e7699e8b5f76c3182
- https://git.kernel.org/stable/c/6fd24675188d354b1cad47462969afa2ab09d819
- https://git.kernel.org/stable/c/a361c2c1da5dbb13ca67601cf961ab3ad68af383
- https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html