{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-31469 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-31469 is a high-severity use after free vulnerability in Linux kernel, published on 22 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-31469 and fix it if it is affected.\n\nWhat it is: CVE-2026-31469 is a high-severity use after free vulnerability in Linux kernel, published on 22 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-31469 in the wild and no public exploit code.\n\nAffected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-31469/ (Markdown: https://insights.sbomify.com/CVE-2026-31469/index.md)","id":"CVE-2026-31469","markdown":"https://insights.sbomify.com/CVE-2026-31469/index.md","name":"CVE-2026-31469","record":{"aliases":["AZL-83264","BELL-CVE-2026-31469","DEBIAN-CVE-2026-31469","GHSA-vggv-f293-vmjw","ROOT-OS-DEBIAN-11-CVE-2026-31469","ROOT-OS-DEBIAN-12-CVE-2026-31469","ROOT-OS-DEBIAN-13-CVE-2026-31469","ROOT-OS-UBUNTU-2204-CVE-2026-31469","ROOT-OS-UBUNTU-2404-CVE-2026-31469","UBUNTU-CVE-2026-31469"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service","code_execution"],"network_reachable":"adjacent_or_local","non_default_config":true,"product_category":"Linux kernel driver","requires_auth":"low_privilege","summary":"A use-after-free in the Linux virtio_net driver allows attackers to cause a system crash or potentially execute code when specific network configurations are used.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":7.8,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvirtio_net: Fix UAF on dst_ops when IFF_XMIT_DST_RELEASE is cleared and napi_tx is false\n\nA UAF issue occurs when the virtio_net driver is configured with napi_tx=N\nand the device's IFF_XMIT_DST_RELEASE flag is cleared\n(e.g., during the configuration of tc route filter rules).\n\nWhen IFF_XMIT_DST_RELEASE is removed from the net_device, the network stack\nexpects the driver to hold the reference to skb-\u003edst until the packet\nis fully transmitted and freed. In virtio_net with napi_tx=N,\nskbs may remain in the virtio transmit ring for an extended period.\n\nIf the network namespace is destroyed while these skbs are still pending,\nthe corresponding dst_ops structure has freed. When a subsequent packet\nis transmitted, free_old_xmit() is triggered to clean up old skbs.\nIt then calls dst_release() on the skb associated with the stale dst_entry.\nSince the dst_ops (referenced by the dst_entry) has already been freed,\na UAF kernel paging request occurs.\n\nfix it by adds skb_dst_drop(skb) in start_xmit to explicitly release\nthe dst reference before the skb is queued in virtio_net.\n\nCall Trace:\n Unable to handle kernel paging request at virtual address ffff80007e150000\n CPU: 2 UID: 0 PID: 6236 Comm: ping Kdump: loaded Not tainted 7.0.0-rc1+ #6 PREEMPT\n  ...\n  percpu_counter_add_batch+0x3c/0x158 lib/percpu_counter.c:98 (P)\n  dst_release+0xe0/0x110  net/core/dst.c:177\n  skb_release_head_state+0xe8/0x108 net/core/skbuff.c:1177\n  sk_skb_reason_drop+0x54/0x2d8 net/core/skbuff.c:1255\n  dev_kfree_skb_any_reason+0x64/0x78 net/core/dev.c:3469\n  napi_consume_skb+0x1c4/0x3a0 net/core/skbuff.c:1527\n  __free_old_xmit+0x164/0x230  drivers/net/virtio_net.c:611 [virtio_net]\n  free_old_xmit drivers/net/virtio_net.c:1081 [virtio_net]\n  start_xmit+0x7c/0x530 drivers/net/virtio_net.c:3329 [virtio_net]\n  ...\n\nReproduction Steps:\nNETDEV=\"enp3s0\"\n\nconfig_qdisc_route_filter() {\n    tc qdisc del dev $NETDEV root\n    tc qdisc add dev $NETDEV root handle 1: prio\n    tc filter add dev $NETDEV parent 1:0 \\\n\tprotocol ip prio 100 route to 100 flowid 1:1\n    ip route add 192.168.1.100/32 dev $NETDEV realm 100\n}\n\ntest_ns() {\n    ip netns add testns\n    ip link set $NETDEV netns testns\n    ip netns exec testns ifconfig $NETDEV  10.0.32.46/24\n    ip netns exec testns ping -c 1 10.0.32.1\n    ip netns del testns\n}\n\nconfig_qdisc_route_filter\n\ntest_ns\nsleep 2\ntest_ns","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"virtio_net: Fix UAF on dst_ops when IFF_XMIT_DST_RELEASE is cleared and napi_tx is false","id":"CVE-2026-31469","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"use_after_free","year":"2026"},"n_packages":0,"n_references":8,"next":{"headline":"virt: tdx-guest: Fix handling of host controlled 'quote' buffer length","id":"CVE-2026-31470"},"packages":[],"prev":{"headline":"vfio/pci: Fix double free in dma-buf feature","id":"CVE-2026-31468"},"products":["Linux"],"published":"2026-04-22","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-19","vendors":["Linux"]},"summary":"A use-after-free in the Linux virtio_net driver allows attackers to cause a system crash or potentially execute code when specific network configurations are used.","url":"https://insights.sbomify.com/CVE-2026-31469/"}