{"id":"CVE-2025-21653","state":"PUBLISHED","title":"net_sched: cls_flow: validate TCA_FLOW_RSHIFT attribute","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: cls_flow: validate TCA_FLOW_RSHIFT attribute\n\nsyzbot found that TCA_FLOW_RSHIFT attribute was not validated.\nRight shitfing a 32bit integer is undefined for large shift values.\n\nUBSAN: shift-out-of-bounds in net/sched/cls_flow.c:329:23\nshift exponent 9445 is too large for 32-bit type 'u32' (aka 'unsigned int')\nCPU: 1 UID: 0 PID: 54 Comm: kworker/u8:3 Not tainted 6.13.0-rc3-syzkaller-00180-g4f619d518db9 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\nWorkqueue: ipv6_addrconf addrconf_dad_work\nCall Trace:\n <TASK>\n  __dump_stack lib/dump_stack.c:94 [inline]\n  dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n  ubsan_epilogue lib/ubsan.c:231 [inline]\n  __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468\n  flow_classify+0x24d5/0x25b0 net/sched/cls_flow.c:329\n  tc_classify include/net/tc_wrapper.h:197 [inline]\n  __tcf_classify net/sched/cls_api.c:1771 [inline]\n  tcf_classify+0x420/0x1160 net/sched/cls_api.c:1867\n  sfb_classify net/sched/sch_sfb.c:260 [inline]\n  sfb_enqueue+0x3ad/0x18b0 net/sched/sch_sfb.c:318\n  dev_qdisc_enqueue+0x4b/0x290 net/core/dev.c:3793\n  __dev_xmit_skb net/core/dev.c:3889 [inline]\n  __dev_queue_xmit+0xf0e/0x3f50 net/core/dev.c:4400\n  dev_queue_xmit include/linux/netdevice.h:3168 [inline]\n  neigh_hh_output include/net/neighbour.h:523 [inline]\n  neigh_output include/net/neighbour.h:537 [inline]\n  ip_finish_output2+0xd41/0x1390 net/ipv4/ip_output.c:236\n  iptunnel_xmit+0x55d/0x9b0 net/ipv4/ip_tunnel_core.c:82\n  udp_tunnel_xmit_skb+0x262/0x3b0 net/ipv4/udp_tunnel_core.c:173\n  geneve_xmit_skb drivers/net/geneve.c:916 [inline]\n  geneve_xmit+0x21dc/0x2d00 drivers/net/geneve.c:1039\n  __netdev_start_xmit include/linux/netdevice.h:5002 [inline]\n  netdev_start_xmit include/linux/netdevice.h:5011 [inline]\n  xmit_one net/core/dev.c:3590 [inline]\n  dev_hard_start_xmit+0x27a/0x7d0 net/core/dev.c:3606\n  __dev_queue_xmit+0x1b73/0x3f50 net/core/dev.c:4434","publishedAt":"2025-01-19T10:18:10.354Z","updatedAt":"2026-10-15T01:02:49.719Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","status":"affected","lessThan":"9858f4afeb2e59506e714176bd3e135539a3eeec","versionType":"git"},{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","status":"affected","lessThan":"43658e4a5f2770ad94e93362885ff51c10cf3179","versionType":"git"},{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","status":"affected","lessThan":"a313d6e6d5f3a631cae5a241c392c28868aa5c5e","versionType":"git"},{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","status":"affected","lessThan":"2011749ca96460386844dfc7e0fde53ebee96f3c","versionType":"git"},{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","status":"affected","lessThan":"e54beb9aed2a90dddf4c5d68fcfc9a01f3e40a61","versionType":"git"},{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","status":"affected","lessThan":"6fde663f7321418996645ee602a473457640542f","versionType":"git"},{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","status":"affected","lessThan":"a039e54397c6a75b713b9ce7894a62e06956aa92","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/cls_flow.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.25","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.25","versionType":"semver"},{"version":"5.4.290","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.234","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.177","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.125","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.72","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.10","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/cls_flow.c"]}],"references":["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","https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html","https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html","https://cert-portal.siemens.com/productcert/html/ssa-265688.html","https://cert-portal.siemens.com/productcert/html/ssa-503939.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:08:39.238Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/21xxx/CVE-2025-21653.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-21653","state":"PUBLISHED","datePublished":"2025-01-19T10:18:10.354Z","dateUpdated":"2026-10-15T01:02:49.719Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-12-29T08:45:45.729Z"},"containers":{"cna":{"title":"net_sched: cls_flow: validate TCA_FLOW_RSHIFT attribute","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: cls_flow: validate TCA_FLOW_RSHIFT attribute\n\nsyzbot found that TCA_FLOW_RSHIFT attribute was not validated.\nRight shitfing a 32bit integer is undefined for large shift values.\n\nUBSAN: shift-out-of-bounds in net/sched/cls_flow.c:329:23\nshift exponent 9445 is too large for 32-bit type 'u32' (aka 'unsigned int')\nCPU: 1 UID: 0 PID: 54 Comm: kworker/u8:3 Not tainted 6.13.0-rc3-syzkaller-00180-g4f619d518db9 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024\nWorkqueue: ipv6_addrconf addrconf_dad_work\nCall Trace:\n <TASK>\n  __dump_stack lib/dump_stack.c:94 [inline]\n  dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n  ubsan_epilogue lib/ubsan.c:231 [inline]\n  __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468\n  flow_classify+0x24d5/0x25b0 net/sched/cls_flow.c:329\n  tc_classify include/net/tc_wrapper.h:197 [inline]\n  __tcf_classify net/sched/cls_api.c:1771 [inline]\n  tcf_classify+0x420/0x1160 net/sched/cls_api.c:1867\n  sfb_classify net/sched/sch_sfb.c:260 [inline]\n  sfb_enqueue+0x3ad/0x18b0 net/sched/sch_sfb.c:318\n  dev_qdisc_enqueue+0x4b/0x290 net/core/dev.c:3793\n  __dev_xmit_skb net/core/dev.c:3889 [inline]\n  __dev_queue_xmit+0xf0e/0x3f50 net/core/dev.c:4400\n  dev_queue_xmit include/linux/netdevice.h:3168 [inline]\n  neigh_hh_output include/net/neighbour.h:523 [inline]\n  neigh_output include/net/neighbour.h:537 [inline]\n  ip_finish_output2+0xd41/0x1390 net/ipv4/ip_output.c:236\n  iptunnel_xmit+0x55d/0x9b0 net/ipv4/ip_tunnel_core.c:82\n  udp_tunnel_xmit_skb+0x262/0x3b0 net/ipv4/udp_tunnel_core.c:173\n  geneve_xmit_skb drivers/net/geneve.c:916 [inline]\n  geneve_xmit+0x21dc/0x2d00 drivers/net/geneve.c:1039\n  __netdev_start_xmit include/linux/netdevice.h:5002 [inline]\n  netdev_start_xmit include/linux/netdevice.h:5011 [inline]\n  xmit_one net/core/dev.c:3590 [inline]\n  dev_hard_start_xmit+0x27a/0x7d0 net/core/dev.c:3606\n  __dev_queue_xmit+0x1b73/0x3f50 net/core/dev.c:4434"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","status":"affected","lessThan":"9858f4afeb2e59506e714176bd3e135539a3eeec","versionType":"git"},{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","status":"affected","lessThan":"43658e4a5f2770ad94e93362885ff51c10cf3179","versionType":"git"},{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","status":"affected","lessThan":"a313d6e6d5f3a631cae5a241c392c28868aa5c5e","versionType":"git"},{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","status":"affected","lessThan":"2011749ca96460386844dfc7e0fde53ebee96f3c","versionType":"git"},{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","status":"affected","lessThan":"e54beb9aed2a90dddf4c5d68fcfc9a01f3e40a61","versionType":"git"},{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","status":"affected","lessThan":"6fde663f7321418996645ee602a473457640542f","versionType":"git"},{"version":"e5dfb815181fcb186d6080ac3a091eadff2d98fe","status":"affected","lessThan":"a039e54397c6a75b713b9ce7894a62e06956aa92","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/cls_flow.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.25","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.25","versionType":"semver"},{"version":"5.4.290","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.234","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.177","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.125","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.72","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.10","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/cls_flow.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/9858f4afeb2e59506e714176bd3e135539a3eeec"},{"url":"https://git.kernel.org/stable/c/43658e4a5f2770ad94e93362885ff51c10cf3179"},{"url":"https://git.kernel.org/stable/c/a313d6e6d5f3a631cae5a241c392c28868aa5c5e"},{"url":"https://git.kernel.org/stable/c/2011749ca96460386844dfc7e0fde53ebee96f3c"},{"url":"https://git.kernel.org/stable/c/e54beb9aed2a90dddf4c5d68fcfc9a01f3e40a61"},{"url":"https://git.kernel.org/stable/c/6fde663f7321418996645ee602a473457640542f"},{"url":"https://git.kernel.org/stable/c/a039e54397c6a75b713b9ce7894a62e06956aa92"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:03:50.397Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"5.4.290"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"5.10.234"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"5.15.177"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.1.125"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.6.72"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.12.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.13"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"},{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-03T20:58:33.343Z"}},{"affected":[{"vendor":"Siemens","product":"SIMATIC S7-1500 TM MFP - BIOS","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]},{"vendor":"Siemens","product":"SIMATIC S7-1500 TM MFP - GNU/Linux subsystem","defaultStatus":"unknown","versions":[{"version":"0","status":"affected","lessThan":"*","versionType":"custom"}]}],"references":[{"url":"https://cert-portal.siemens.com/productcert/html/ssa-265688.html"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-503939.html"}],"providerMetadata":{"shortName":"siemens-SADP","orgId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","dateUpdated":"2026-10-15T01:02:49.719Z"},"x_adpType":"supplier"}]}}}