{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"HIGH" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: defensively unhash xfrm_state lists in __xfrm_state_delete\n\nKASAN reproduces a slab-use-after-free in __xfrm_state_delete()'s\nhlist_del_rcu calls under syzkaller load on linux-6.12.y stable\n(reproduced on 6.12.47, also reachable via the same code path on\ntorvalds/master and on the ipsec tree). Nine unique signatures cluster\nin the xfrm_state lifecycle, the load-bearing one being:\n\n BUG: KASAN: slab-use-after-free in __hlist_del include/linux/list.h:990 [inline]\n BUG: KASAN: slab-use-after-free in hlist_del_rcu include/linux/rculist.h:516 [inline]\n BUG: KASAN: slab-use-after-free in __xfrm_state_delete net/xfrm/xfrm_state.c\n Write of size 8 at addr ffff8881198bcb70 by task kworker/u8:9/435\n\n Workqueue: netns cleanup_net\n Call Trace:\n __hlist_del / hlist_del_rcu\n __xfrm_state_delete\n xfrm_state_delete\n xfrm_state_flush\n xfrm_state_fini\n ops_exit_list\n cleanup_net\n\nThe other observed signatures hit the same slab object from\n__xfrm_state_lookup, xfrm_alloc_spi, __xfrm_state_insert and an OOB\nwrite variant of __xfrm_state_delete, all on the byseq/byspi\nhash chains.\n\n__xfrm_state_delete() guards its byseq and byspi unhashes with\nvalue-based predicates:\n\n\tif (x->km.seq)\n\t\thlist_del_rcu(&x->byseq);\n\tif (x->id.spi)\n\t\thlist_del_rcu(&x->byspi);\n\nwhile everywhere else in the file (e.g. state_cache, state_cache_input)\nthe safer hlist_unhashed() check is used. xfrm_alloc_spi() sets\nx->id.spi = newspi inside xfrm_state_lock and then immediately inserts\ninto byspi, but a path that observes x->id.spi != 0 outside of\nxfrm_state_lock can still skip-or-hit the byspi unhash inconsistently\nwith whether x is actually on the list. The same holds for x->km.seq\nversus byseq, and the bydst/bysrc unhashes have no predicate at all,\nso a second __xfrm_state_delete() on the same object writes through\nLIST_POISON pprev.\n\nThe defensive change here:\n\n - Use hlist_del_init_rcu() instead of hlist_del_rcu() on bydst,\n bysrc, byseq and byspi so a second deletion is a no-op rather\n than a write through LIST_POISON pprev. The byseq/byspi nodes\n are already initialised in xfrm_state_alloc().\n - Test hlist_unhashed() rather than the value predicate for\n byseq/byspi, so the unhash decision tracks list state rather than\n mutable scalar fields.\n\nEmpirical verification: applied this patch on top of v6.12.47, rebuilt,\nand re-ran the same syzkaller harness for 1h16m on a previously-crashy\nconfiguration that produced ~100 hits each of slab-use-after-free\nRead in xfrm_alloc_spi / Read in __xfrm_state_lookup / Write in\n__xfrm_state_delete. After the patch, 7.1M execs across 32 VMs at\n~1550 exec/sec produced zero xfrm_state UAF/OOB hits. /proc/slabinfo\nconfirms the xfrm_state slab is actively allocated and freed during\nthe run (~143 KiB resident), so the fuzzer is still exercising those\ncode paths -- they just no longer crash.\n\nReproduction:\n\n - Linux 6.12.47 x86_64 + KASAN_GENERIC + KASAN_INLINE + KCOV\n - syzkaller @ 746545b8b1e4c3a128db8652b340d3df90ce61db\n - 32 QEMU/KVM VMs x 2 vCPU on AWS c5.metal bare metal\n - 9 unique signatures collected in ~9h, all within xfrm_state\n lifecycle", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46116" }, { "summary":"CVE-2026-46116 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2026/csaf-openeuler-cve-2026-46116.json" }, { "summary":"openEuler-SA-2026-2674", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2674" }, { "summary":"CVE-2026-46116", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-46116&packageName=kernel" } ], "title":"openEuler cve CVE-2026-46116", "tracking":{ "initial_release_date":"2026-06-18T16:38:50+08:00", "revision_history":[ { "date":"2026-06-18T16:38:50+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-06-18T16:38:50+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-06-18T16:38:50+08:00", "id":"CVE-2026-46116", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"openEuler-22.03-LTS-SP4", "name":"openEuler-22.03-LTS-SP4" }, 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Nine unique signatures cluster\nin the xfrm_state lifecycle, the load-bearing one being:\n\n BUG: KASAN: slab-use-after-free in __hlist_del include/linux/list.h:990 [inline]\n BUG: KASAN: slab-use-after-free in hlist_del_rcu include/linux/rculist.h:516 [inline]\n BUG: KASAN: slab-use-after-free in __xfrm_state_delete net/xfrm/xfrm_state.c\n Write of size 8 at addr ffff8881198bcb70 by task kworker/u8:9/435\n\n Workqueue: netns cleanup_net\n Call Trace:\n __hlist_del / hlist_del_rcu\n __xfrm_state_delete\n xfrm_state_delete\n xfrm_state_flush\n xfrm_state_fini\n ops_exit_list\n cleanup_net\n\nThe other observed signatures hit the same slab object from\n__xfrm_state_lookup, xfrm_alloc_spi, __xfrm_state_insert and an OOB\nwrite variant of __xfrm_state_delete, all on the byseq/byspi\nhash chains.\n\n__xfrm_state_delete() guards its byseq and byspi unhashes with\nvalue-based predicates:\n\n\tif (x->km.seq)\n\t\thlist_del_rcu(&x->byseq);\n\tif (x->id.spi)\n\t\thlist_del_rcu(&x->byspi);\n\nwhile everywhere else in the file (e.g. state_cache, state_cache_input)\nthe safer hlist_unhashed() check is used. xfrm_alloc_spi() sets\nx->id.spi = newspi inside xfrm_state_lock and then immediately inserts\ninto byspi, but a path that observes x->id.spi != 0 outside of\nxfrm_state_lock can still skip-or-hit the byspi unhash inconsistently\nwith whether x is actually on the list. The same holds for x->km.seq\nversus byseq, and the bydst/bysrc unhashes have no predicate at all,\nso a second __xfrm_state_delete() on the same object writes through\nLIST_POISON pprev.\n\nThe defensive change here:\n\n - Use hlist_del_init_rcu() instead of hlist_del_rcu() on bydst,\n bysrc, byseq and byspi so a second deletion is a no-op rather\n than a write through LIST_POISON pprev. The byseq/byspi nodes\n are already initialised in xfrm_state_alloc().\n - Test hlist_unhashed() rather than the value predicate for\n byseq/byspi, so the unhash decision tracks list state rather than\n mutable scalar fields.\n\nEmpirical verification: applied this patch on top of v6.12.47, rebuilt,\nand re-ran the same syzkaller harness for 1h16m on a previously-crashy\nconfiguration that produced ~100 hits each of slab-use-after-free\nRead in xfrm_alloc_spi / Read in __xfrm_state_lookup / Write in\n__xfrm_state_delete. After the patch, 7.1M execs across 32 VMs at\n~1550 exec/sec produced zero xfrm_state UAF/OOB hits. /proc/slabinfo\nconfirms the xfrm_state slab is actively allocated and freed during\nthe run (~143 KiB resident), so the fuzzer is still exercising those\ncode paths -- they just no longer crash.\n\nReproduction:\n\n - Linux 6.12.47 x86_64 + KASAN_GENERIC + KASAN_INLINE + KCOV\n - syzkaller @ 746545b8b1e4c3a128db8652b340d3df90ce61db\n - 32 QEMU/KVM VMs x 2 vCPU on AWS c5.metal bare metal\n - 9 unique signatures collected in ~9h, all within xfrm_state\n lifecycle", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-22.03-LTS-SP4:bpftool-5.10.0-318.0.0.221.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:bpftool-debuginfo-5.10.0-318.0.0.221.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-318.0.0.221.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-debuginfo-5.10.0-318.0.0.221.oe2203sp4.aarch64", 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"baseScore":7.8, "vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version":"3.1" }, "products":[ "openEuler-22.03-LTS-SP4:bpftool-5.10.0-318.0.0.221.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:bpftool-debuginfo-5.10.0-318.0.0.221.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-318.0.0.221.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-debuginfo-5.10.0-318.0.0.221.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-debugsource-5.10.0-318.0.0.221.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-devel-5.10.0-318.0.0.221.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-headers-5.10.0-318.0.0.221.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-source-5.10.0-318.0.0.221.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-tools-5.10.0-318.0.0.221.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-tools-debuginfo-5.10.0-318.0.0.221.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-tools-devel-5.10.0-318.0.0.221.oe2203sp4.aarch64", 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