| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-21653: net_sched: cls_flow: validate TCA_FLOW_RSHIFT attribute |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net_sched: cls_flow: validate TCA_FLOW_RSHIFT attribute |
| |
| syzbot found that TCA_FLOW_RSHIFT attribute was not validated. |
| Right shitfing a 32bit integer is undefined for large shift values. |
| |
| UBSAN: shift-out-of-bounds in net/sched/cls_flow.c:329:23 |
| shift exponent 9445 is too large for 32-bit type 'u32' (aka 'unsigned int') |
| CPU: 1 UID: 0 PID: 54 Comm: kworker/u8:3 Not tainted 6.13.0-rc3-syzkaller-00180-g4f619d518db9 #0 |
| Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 |
| Workqueue: ipv6_addrconf addrconf_dad_work |
| Call Trace: |
| <TASK> |
| __dump_stack lib/dump_stack.c:94 [inline] |
| dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 |
| ubsan_epilogue lib/ubsan.c:231 [inline] |
| __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468 |
| flow_classify+0x24d5/0x25b0 net/sched/cls_flow.c:329 |
| tc_classify include/net/tc_wrapper.h:197 [inline] |
| __tcf_classify net/sched/cls_api.c:1771 [inline] |
| tcf_classify+0x420/0x1160 net/sched/cls_api.c:1867 |
| sfb_classify net/sched/sch_sfb.c:260 [inline] |
| sfb_enqueue+0x3ad/0x18b0 net/sched/sch_sfb.c:318 |
| dev_qdisc_enqueue+0x4b/0x290 net/core/dev.c:3793 |
| __dev_xmit_skb net/core/dev.c:3889 [inline] |
| __dev_queue_xmit+0xf0e/0x3f50 net/core/dev.c:4400 |
| dev_queue_xmit include/linux/netdevice.h:3168 [inline] |
| neigh_hh_output include/net/neighbour.h:523 [inline] |
| neigh_output include/net/neighbour.h:537 [inline] |
| ip_finish_output2+0xd41/0x1390 net/ipv4/ip_output.c:236 |
| iptunnel_xmit+0x55d/0x9b0 net/ipv4/ip_tunnel_core.c:82 |
| udp_tunnel_xmit_skb+0x262/0x3b0 net/ipv4/udp_tunnel_core.c:173 |
| geneve_xmit_skb drivers/net/geneve.c:916 [inline] |
| geneve_xmit+0x21dc/0x2d00 drivers/net/geneve.c:1039 |
| __netdev_start_xmit include/linux/netdevice.h:5002 [inline] |
| netdev_start_xmit include/linux/netdevice.h:5011 [inline] |
| xmit_one net/core/dev.c:3590 [inline] |
| dev_hard_start_xmit+0x27a/0x7d0 net/core/dev.c:3606 |
| __dev_queue_xmit+0x1b73/0x3f50 net/core/dev.c:4434 |
| |
| The Linux kernel CVE team has assigned CVE-2025-21653 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.25 with commit e5dfb815181fcb186d6080ac3a091eadff2d98fe and fixed in 5.4.290 with commit 9858f4afeb2e59506e714176bd3e135539a3eeec |
| Issue introduced in 2.6.25 with commit e5dfb815181fcb186d6080ac3a091eadff2d98fe and fixed in 5.10.234 with commit 43658e4a5f2770ad94e93362885ff51c10cf3179 |
| Issue introduced in 2.6.25 with commit e5dfb815181fcb186d6080ac3a091eadff2d98fe and fixed in 5.15.177 with commit a313d6e6d5f3a631cae5a241c392c28868aa5c5e |
| Issue introduced in 2.6.25 with commit e5dfb815181fcb186d6080ac3a091eadff2d98fe and fixed in 6.1.125 with commit 2011749ca96460386844dfc7e0fde53ebee96f3c |
| Issue introduced in 2.6.25 with commit e5dfb815181fcb186d6080ac3a091eadff2d98fe and fixed in 6.6.72 with commit e54beb9aed2a90dddf4c5d68fcfc9a01f3e40a61 |
| Issue introduced in 2.6.25 with commit e5dfb815181fcb186d6080ac3a091eadff2d98fe and fixed in 6.12.10 with commit 6fde663f7321418996645ee602a473457640542f |
| Issue introduced in 2.6.25 with commit e5dfb815181fcb186d6080ac3a091eadff2d98fe and fixed in 6.13 with commit a039e54397c6a75b713b9ce7894a62e06956aa92 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2025-21653 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| net/sched/cls_flow.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/9858f4afeb2e59506e714176bd3e135539a3eeec |
| https://git.kernel.org/stable/c/43658e4a5f2770ad94e93362885ff51c10cf3179 |
| https://git.kernel.org/stable/c/a313d6e6d5f3a631cae5a241c392c28868aa5c5e |
| https://git.kernel.org/stable/c/2011749ca96460386844dfc7e0fde53ebee96f3c |
| https://git.kernel.org/stable/c/e54beb9aed2a90dddf4c5d68fcfc9a01f3e40a61 |
| https://git.kernel.org/stable/c/6fde663f7321418996645ee602a473457640542f |
| https://git.kernel.org/stable/c/a039e54397c6a75b713b9ce7894a62e06956aa92 |
