{"id":"CVE-2026-98380","revision":"7f582d49c728424795f4c34dc7e46866","records":[{"revision":"7f582d49c728424795f4c34dc7e46866","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98380","aliases":[],"title":"net/sched: reject IDR error pointers when deleting actions","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: reject IDR error pointers when deleting actions\n\ntcf_action_delete() drops the reference held by its lookup before calling\ntcf_idr_delete_index() with the saved action index.  An unlocked\nclassifier can remove that action and reserve the same IDR slot with\nERR_PTR(-EBUSY) in between.\n\ntcf_idr_delete_index() only checks the lookup result for NULL.  It\ntherefore treats the reservation as a tc_action and dereferences\ntcfa_bindcnt.  A hardware execution breakpoint was used to schedule the\ninterleaving without changing the kernel source.  KASAN reported this\ndecoded trace:\n\n  BUG: KASAN: null-ptr-deref in tca_action_gd+0x5b9/0x1010\n  Read of size 4 at addr 0000000000000010 by task poc/150\n  Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002\n  RIP: tca_action_gd+0x5c0/0x1010:\n    arch_atomic_read at arch/x86/include/asm/atomic.h:23\n    raw_atomic_read at include/linux/atomic/atomic-arch-fallback.h:457\n    atomic_read at include/linux/atomic/atomic-instrumented.h:33\n    tcf_idr_delete_index at net/sched/act_api.c:766\n    tcf_action_delete at net/sched/act_api.c:1859\n    tcf_del_notify at net/sched/act_api.c:2014\n    tca_action_gd at net/sched/act_api.c:2064\n  R13: 0000000000000010 R15: fffffffffffffff0\n  Kernel panic - not syncing: Fatal exception\n\nR15 contains ERR_PTR(-EBUSY), and adding the tcfa_bindcnt offset produces\nthe address in R13.  With the guard applied, the same reproducer returned\n-ENOENT without a KASAN report or panic.  Treat error pointers as absent\nand return -ENOENT.","state":0,"publishedAt":"2026-10-09T07:34:20.218+00:00","modifiedAt":"2026-10-19T09:18:31.007+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sched/act_api.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"0190c1d452a91c38a3462abdd81752be1b9006a8\",\n                            \"lessThan\": \"39b751a210bf61a374afa82749afc7a77a08bf1d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0190c1d452a91c38a3462abdd81752be1b9006a8\",\n                            \"lessThan\": \"dd80a7519824b72c8fcfd3cc50cb93f7e2d90923\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0190c1d452a91c38a3462abdd81752be1b9006a8\",\n                            \"lessThan\": \"6bf076258aac4e0af69ef317656c31ce6444d647\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0190c1d452a91c38a3462abdd81752be1b9006a8\",\n                            \"lessThan\": \"6c9f07bf8800171de2cd3f02815cebe1f4d45f2d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0190c1d452a91c38a3462abdd81752be1b9006a8\",\n                            \"lessThan\": \"259caa711b7688365676442e2fdb286b8aceaa80\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0190c1d452a91c38a3462abdd81752be1b9006a8\",\n                            \"lessThan\": \"968550a439f64bd1a6c0d88efb92e4f082f84a26\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0190c1d452a91c38a3462abdd81752be1b9006a8\",\n                            \"lessThan\": \"a9551f26287debe6d8aa6e8841974661065b975f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"0190c1d452a91c38a3462abdd81752be1b9006a8\",\n                            \"lessThan\": \"c82b797abe668d0b668601a93ba2c0b071a63574\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sched/act_api.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.19\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.19\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.112\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.55\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.9\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/39b751a210bf61a374afa82749afc7a77a08bf1d","https://git.kernel.org/stable/c/dd80a7519824b72c8fcfd3cc50cb93f7e2d90923","https://git.kernel.org/stable/c/6bf076258aac4e0af69ef317656c31ce6444d647","https://git.kernel.org/stable/c/6c9f07bf8800171de2cd3f02815cebe1f4d45f2d","https://git.kernel.org/stable/c/259caa711b7688365676442e2fdb286b8aceaa80","https://git.kernel.org/stable/c/968550a439f64bd1a6c0d88efb92e4f082f84a26","https://git.kernel.org/stable/c/a9551f26287debe6d8aa6e8841974661065b975f","https://git.kernel.org/stable/c/c82b797abe668d0b668601a93ba2c0b071a63574"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98380","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98380","identifiers":["CVE-2026-98380"]},"retained":false,"historicalAffected":[]}],"coverage":[]}