{"id":"CVE-2026-64530","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle\n\ntcf_classify() can return TC_ACT_CONSUMED while the skb is held by the\ndefragmentation engine (e.g","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle\n\ntcf_classify() can return TC_ACT_CONSUMED while the skb is held by the\ndefragmentation engine (e.g. act…","severity":"high","published":"2026-07-26","updated":"2026-07-26","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-64530","references":[{"url":"https://git.kernel.org/stable/c/2140c2f3f2e7b066e1ae616ede8856cafd8015e9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/447d493034a9cf7bf13a2abac86d0573d907ec2f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5ed3d6f85991656667059d3fa5a1d683ac58c447","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a8a02897f2b479127db261de05cbf0c28b98d159","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e1270e69dcf2c3512c453484178f2e9dc0db3f05","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e28aedab9488343924d227b5a896faed67ce84d5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f42e8134a3a1074b834a574d404352f867ba994a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64530.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-64530"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2504052"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64530"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64530"},{"url":"https://lore.kernel.org/linux-cve-announce/2026072624-CVE-2026-64530-52e9@gregkh/T/#u"},{"url":"https://access.redhat.com/errata/RHSA-2026:47620"},{"url":"https://access.redhat.com/errata/RHSA-2026:49211"},{"url":"https://access.redhat.com/errata/RHSA-2026:49032"},{"url":"https://access.redhat.com/errata/RHSA-2026:49212"},{"url":"https://access.redhat.com/errata/RHSA-2026:55618"},{"url":"https://access.redhat.com/errata/RHSA-2026:49214"},{"url":"https://access.redhat.com/errata/RHSA-2026:55762"},{"url":"https://access.redhat.com/errata/RHSA-2026:49033"},{"url":"https://access.redhat.com/errata/RHSA-2026:55761"},{"url":"https://access.redhat.com/errata/RHSA-2026:55837"},{"url":"https://access.redhat.com/errata/RHSA-2026:56224"},{"url":"https://access.redhat.com/errata/RHSA-2026:56225"},{"url":"https://access.redhat.com/errata/RHSA-2026:55763"},{"url":"https://access.redhat.com/errata/RHSA-2026:49213"},{"url":"https://access.redhat.com/errata/RHSA-2026:48222"},{"url":"https://access.redhat.com/errata/RHSA-2026:67277"}],"tags":["nvd","csaf","vex","red-hat"],"ingestedAt":"2026-07-26T11:12:03.220Z","epss":0.00536,"epssPercentile":0.43944,"vendor":"Red Hat","product":"Red Hat Enterprise Linux BaseOS E4S (v.9.2)","affected":["enterprise_linux 9","enterprise_linux_for_nvidia 26","enterprise_linux_appstream_eus_v_10_0","enterprise_linux_appstream_v_10","enterprise_linux_appstream_e4s_v_9_2","enterprise_linux_appstream_v_9","enterprise_linux_baseos_eus_v_10_0","enterprise_linux_baseos_v_10","enterprise_linux_baseos_v_8","enterprise_linux_baseos_aus_v_8_6","enterprise_linux_baseos_eus_extension_v_8_6","enterprise_linux_baseos_e4s_v_8_8","enterprise_linux_baseos_e4s_v_9_2","enterprise_linux_baseos_e4s_v_9_4","enterprise_linux_baseos_eus_v_9_6","enterprise_linux_baseos_v_9","enterprise_linux_codeready_linux_builder_eus_v_10_0","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_crb_v_8","enterprise_linux_codeready_linux_builder_v_9","enterprise_linux_real_time_for_nfv_eus_v_10_0","enterprise_linux_real_time_for_nfv_v_10","enterprise_linux_nfv_v_8","enterprise_linux_real_time_for_nfv_e4s_v_9_2","enterprise_linux_real_time_for_nfv_v_9","enterprise_linux_real_time_eus_v_10_0","enterprise_linux_real_time_v_10","enterprise_linux_rt_v_8","enterprise_linux_real_time_e4s_v_9_2","enterprise_linux_real_time_v_9"],"patched":["enterprise_linux_appstream_eus_v_10_0","enterprise_linux_appstream_v_10","enterprise_linux_appstream_e4s_v_9_2","enterprise_linux_appstream_v_9","enterprise_linux_baseos_eus_v_10_0","enterprise_linux_baseos_v_10","enterprise_linux_baseos_v_8","enterprise_linux_baseos_aus_v_8_6","enterprise_linux_baseos_eus_extension_v_8_6","enterprise_linux_baseos_e4s_v_8_8","enterprise_linux_baseos_e4s_v_9_2","enterprise_linux_baseos_e4s_v_9_4","enterprise_linux_baseos_eus_v_9_6","enterprise_linux_baseos_v_9","enterprise_linux_codeready_linux_builder_eus_v_10_0","enterprise_linux_codeready_linux_builder_v_10","enterprise_linux_crb_v_8","enterprise_linux_codeready_linux_builder_v_9","enterprise_linux_real_time_for_nfv_eus_v_10_0","enterprise_linux_real_time_for_nfv_v_10","enterprise_linux_nfv_v_8","enterprise_linux_real_time_for_nfv_e4s_v_9_2","enterprise_linux_real_time_for_nfv_v_9","enterprise_linux_real_time_eus_v_10_0","enterprise_linux_real_time_v_10","enterprise_linux_rt_v_8","enterprise_linux_real_time_e4s_v_9_2","enterprise_linux_real_time_v_9"],"cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"vendor","cwe":["CWE-431"],"slug":"CVE-2026-64530","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle\n\ntcf_classify() can return TC_ACT_CONSUMED while the skb is held by the\ndefragmentation engine (e.g. act_ct on out-of-order fragments). When\nthat happens the skb is no longer owned by the caller and must not be\ntouched again.\n\ntcf_qevent_handle() did not handle TC_ACT_CONSUMED: it fell through the\nswitch and returned the skb to the caller as if classification had\npassed. The only qdisc that wires up qevents today is RED, via three call sites\n(qe_mark on RED_PROB_MARK/HARD_MARK, qe_early_drop on congestion_drop)\nred_enqueue() was continuing to operate on an skb it no longer owns  in this\ncase -- enqueueing it, dropping it, or updating statistics. Resulting in a UAF.\n\n  tc qdisc add dev eth0 root handle 1: red ... qevent early_drop block 10\n  tc filter add block 10 ... action ct\n\n  (with ct defrag enabled and traffic that produces out-of-order\n  fragments, e.g. a fragmented UDP stream)\n\nHandle TC_ACT_CONSUMED in tcf_qevent_handle() the same way the ingress\nand egress fast paths do: treat it as stolen and return NULL without\ntouching the skb. Unlike the TC_ACT_STOLEN case, the skb must not be\ndropped/freed here, as it is no longer owned by us.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:47620** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0), Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0), Red Hat Enterprise Linux Real Time EUS (v. 10.0) · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:47620)\n- **RHSA-2026:49211** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), Red Hat Enterprise Linux Real Time (v. 10) · released 2026-07-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:49211)\n- **RHSA-2026:49032** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux BaseOS E4S (v.9.2) · released 2026-07-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:49032)\n- **RHSA-2026:49212** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9), Red Hat Enterprise Linux Real Time (v. 9) · released 2026-07-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:49212)\n- **RHSA-2026:55618** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 10) · released 2026-08-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:55618)\n- **RHSA-2026:49214** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-07-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:49214)\n- **RHSA-2026:55762** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8) · released 2026-08-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:55762)\n- **RHSA-2026:49033** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS AUS (v.8.6), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) · released 2026-07-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:49033)\n- **RHSA-2026:55761** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS E4S (v.8.8) · released 2026-08-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:55761)\n- **RHSA-2026:55837** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS E4S (v.9.2) · released 2026-08-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:55837)\n- **RHSA-2026:56224** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS E4S (v.9.4) · released 2026-08-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:56224)\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 9 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64530.json)\n- **RHSA-2026:67277** · Red Hat · fixed in: NVIDIA for RHEL 10 · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:67277)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":201856,"id":"CVE-2026-64530","ts":1789399909249,"field":"cvss","old":null,"new":"7.8"},{"seq":201855,"id":"CVE-2026-64530","ts":1789399909249,"field":"severity","old":"none","new":"high"},{"seq":200586,"id":"CVE-2026-64530","ts":1789397449398,"field":"cvss","old":"7.8","new":null},{"seq":200585,"id":"CVE-2026-64530","ts":1789397449398,"field":"severity","old":"high","new":"none"},{"seq":198503,"id":"CVE-2026-64530","ts":1789392044853,"field":"cvss","old":null,"new":"7.8"},{"seq":198502,"id":"CVE-2026-64530","ts":1789392044853,"field":"severity","old":"none","new":"high"},{"seq":196294,"id":"CVE-2026-64530","ts":1789383652623,"field":"cvss","old":"7.8","new":null},{"seq":196293,"id":"CVE-2026-64530","ts":1789383652623,"field":"severity","old":"high","new":"none"},{"seq":195223,"id":"CVE-2026-64530","ts":1789380508861,"field":"cvss","old":null,"new":"7.8"},{"seq":195222,"id":"CVE-2026-64530","ts":1789380508861,"field":"severity","old":"none","new":"high"},{"seq":194010,"id":"CVE-2026-64530","ts":1789378589738,"field":"cvss","old":"7.8","new":null},{"seq":194009,"id":"CVE-2026-64530","ts":1789378589738,"field":"severity","old":"high","new":"none"},{"seq":192797,"id":"CVE-2026-64530","ts":1789376439056,"field":"cvss","old":null,"new":"7.8"},{"seq":192796,"id":"CVE-2026-64530","ts":1789376439056,"field":"severity","old":"none","new":"high"},{"seq":191584,"id":"CVE-2026-64530","ts":1789373502531,"field":"cvss","old":"7.8","new":null},{"seq":191583,"id":"CVE-2026-64530","ts":1789373502531,"field":"severity","old":"high","new":"none"},{"seq":190369,"id":"CVE-2026-64530","ts":1789369388100,"field":"cvss","old":null,"new":"7.8"},{"seq":190368,"id":"CVE-2026-64530","ts":1789369388100,"field":"severity","old":"none","new":"high"},{"seq":189156,"id":"CVE-2026-64530","ts":1789368308496,"field":"cvss","old":"7.8","new":null},{"seq":189155,"id":"CVE-2026-64530","ts":1789368308496,"field":"severity","old":"high","new":"none"},{"seq":187939,"id":"CVE-2026-64530","ts":1789365179434,"field":"cvss","old":null,"new":"7.8"},{"seq":187938,"id":"CVE-2026-64530","ts":1789365179434,"field":"severity","old":"none","new":"high"},{"seq":186726,"id":"CVE-2026-64530","ts":1789363350455,"field":"cvss","old":"7.8","new":null},{"seq":186725,"id":"CVE-2026-64530","ts":1789363350455,"field":"severity","old":"high","new":"none"},{"seq":185512,"id":"CVE-2026-64530","ts":1789361158487,"field":"cvss","old":null,"new":"7.8"},{"seq":185511,"id":"CVE-2026-64530","ts":1789361158487,"field":"severity","old":"none","new":"high"},{"seq":184299,"id":"CVE-2026-64530","ts":1789358221102,"field":"cvss","old":"7.8","new":null},{"seq":184298,"id":"CVE-2026-64530","ts":1789358221102,"field":"severity","old":"high","new":"none"},{"seq":182550,"id":"CVE-2026-64530","ts":1789354255205,"field":"cvss","old":null,"new":"7.8"},{"seq":182549,"id":"CVE-2026-64530","ts":1789354255205,"field":"severity","old":"none","new":"high"},{"seq":181343,"id":"CVE-2026-64530","ts":1789353206985,"field":"cvss","old":"7.8","new":null},{"seq":181342,"id":"CVE-2026-64530","ts":1789353206985,"field":"severity","old":"high","new":"none"},{"seq":180136,"id":"CVE-2026-64530","ts":1789350208244,"field":"cvss","old":null,"new":"7.8"},{"seq":180135,"id":"CVE-2026-64530","ts":1789350208244,"field":"severity","old":"none","new":"high"},{"seq":178929,"id":"CVE-2026-64530","ts":1789348168468,"field":"cvss","old":"7.8","new":null},{"seq":178928,"id":"CVE-2026-64530","ts":1789348168468,"field":"severity","old":"high","new":"none"},{"seq":177722,"id":"CVE-2026-64530","ts":1789346314304,"field":"cvss","old":null,"new":"7.8"},{"seq":177721,"id":"CVE-2026-64530","ts":1789346314304,"field":"severity","old":"none","new":"high"},{"seq":176515,"id":"CVE-2026-64530","ts":1789343090509,"field":"cvss","old":"7.8","new":null},{"seq":176514,"id":"CVE-2026-64530","ts":1789343090509,"field":"severity","old":"high","new":"none"},{"seq":174632,"id":"CVE-2026-64530","ts":1789334822003,"field":"cvss","old":null,"new":"7.8"},{"seq":174631,"id":"CVE-2026-64530","ts":1789334822003,"field":"severity","old":"none","new":"high"},{"seq":173427,"id":"CVE-2026-64530","ts":1789333565106,"field":"cvss","old":"7.8","new":null},{"seq":173426,"id":"CVE-2026-64530","ts":1789333565106,"field":"severity","old":"high","new":"none"},{"seq":172241,"id":"CVE-2026-64530","ts":1789331039501,"field":"cvss","old":null,"new":"7.8"},{"seq":172240,"id":"CVE-2026-64530","ts":1789331039501,"field":"severity","old":"none","new":"high"},{"seq":171055,"id":"CVE-2026-64530","ts":1789328666135,"field":"cvss","old":"7.8","new":null},{"seq":171054,"id":"CVE-2026-64530","ts":1789328666135,"field":"severity","old":"high","new":"none"},{"seq":169850,"id":"CVE-2026-64530","ts":1789327091010,"field":"cvss","old":null,"new":"7.8"},{"seq":169849,"id":"CVE-2026-64530","ts":1789327091010,"field":"severity","old":"none","new":"high"}]}