Bug 2265799 (CVE-2024-26595) - CVE-2024-26595 kernel: mlxsw: spectrum_acl_tcam: Fix NULL pointer dereference in error path
Summary: CVE-2024-26595 kernel: mlxsw: spectrum_acl_tcam: Fix NULL pointer dereference...
Keywords:
Status: NEW
Alias: CVE-2024-26595
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2265811
Blocks: 2265790
TreeView+ depends on / blocked
 
Reported: 2024-02-24 11:20 UTC by Patrick Del Bello
Modified: 2024-04-07 15:17 UTC (History)
49 users (show)

Fixed In Version: kernel 6.8-rc1
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Description Patrick Del Bello 2024-02-24 11:20:25 UTC 
When calling mlxsw_sp_acl_tcam_region_destroy() from an error path after
failing to attach the region to an ACL group, we hit a NULL pointer
dereference upon 'region->group->tcam' [1].

Fix by retrieving the 'tcam' pointer using mlxsw_sp_acl_to_tcam().

[1]
BUG: kernel NULL pointer dereference, address: 0000000000000000
[...]
RIP: 0010:mlxsw_sp_acl_tcam_region_destroy+0xa0/0xd0
[...]
Call Trace:
 mlxsw_sp_acl_tcam_vchunk_get+0x88b/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
Comment 1 Patrick Del Bello 2024-02-24 11:25:46 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2265811]
Comment 3 Justin M. Forbes 2024-02-27 00:02:19 UTC 
	Issue introduced in 4.11 with commit 22a677661f56 and fixed in 6.6.14 with commit 817840d125a3
	Issue introduced in 4.11 with commit 22a677661f56 and fixed in 6.7.2 with commit d0a1efe417c9
	Issue introduced in 4.11 with commit 22a677661f56 and fixed in 6.8-rc1 with commit efeb7dfea8ee
Comment 4 Justin M. Forbes 2024-02-27 00:02:50 UTC 
This was fixed for Fedora with the 6.6.14 stable kernel updates.
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