{"id":"CVE-2026-23391","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_CT: drop pending enqueued packets on template removal\n\nTemplates refer to objects that can go away while packets are sitting in\nnfqueue refer to:\n\n- helpe…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_CT: drop pending enqueued packets on template removal\n\nTemplates refer to objects that can go away while packets are sitting in\nnfqueue refer to:\n\n- helpe…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 3.4.1, < 5.10.253","linux_kernel >= 5.11, < 5.15.203","linux_kernel >= 5.16, < 6.1.167","linux_kernel >= 6.2, < 6.6.130","linux_kernel >= 6.7, < 6.12.78","linux_kernel >= 6.13, < 6.18.20","linux_kernel >= 6.19, < 6.19.10","linux_kernel = 3.4","linux_kernel = 7.0"],"patched":["linux_kernel 6.19.10"],"published":"2026-03-25","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:18:54.223","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-23391","references":[{"url":"https://git.kernel.org/stable/c/19a230dec6bb8928e3f96387f9085cf2c79bcef9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/55445134d42b84cb0a272e42c98d233ca65eca83","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/63b8097cea1923fe82cd598068d0796da8c015ec","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/777d02efe3d630cca4c1b63962cec17c57711325","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cb549925875fa06dd155e49db4ac2c5044c30f9c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cc57506dd66555899560b9c0f24e813f034e12ec","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d2d0bae0c9a2a17b6990a2966f5cdce0813d6256","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f62a218a946b19bb59abdd5361da85fa4606b96b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-457936.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-784472.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00131,"epssPercentile":0.02689,"ingestedAt":"2026-09-08T15:33:26.992Z","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:07:33.341687Z"},"slug":"CVE-2026-23391","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_CT: drop pending enqueued packets on template removal\n\nTemplates refer to objects that can go away while packets are sitting in\nnfqueue refer to:\n\n- helper, this can be an issue on module removal.\n- timeout policy, nfnetlink_cttimeout might remove it.\n\nThe use of templates with zone and event cache filter are safe, since\nthis just copies values.\n\nFlush these enqueued packets in case the template rule gets removed.\n\n## Affected\n\n- `linux_kernel >= 3.4.1, < 5.10.253`\n- `linux_kernel >= 5.11, < 5.15.203`\n- `linux_kernel >= 5.16, < 6.1.167`\n- `linux_kernel >= 6.2, < 6.6.130`\n- `linux_kernel >= 6.7, < 6.12.78`\n- `linux_kernel >= 6.13, < 6.18.20`\n- `linux_kernel >= 6.19, < 6.19.10`\n- `linux_kernel = 3.4`\n- `linux_kernel = 7.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.19.10`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}