CVE-2026-98380 (GCVE-0-2026-98380)
Vulnerability from cvelistv5
Published
2026-10-09 07:34
Modified
2026-10-19 09:18
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: reject IDR error pointers when deleting actions tcf_action_delete() drops the reference held by its lookup before calling tcf_idr_delete_index() with the saved action index. An unlocked classifier can remove that action and reserve the same IDR slot with ERR_PTR(-EBUSY) in between. tcf_idr_delete_index() only checks the lookup result for NULL. It therefore treats the reservation as a tc_action and dereferences tcfa_bindcnt. A hardware execution breakpoint was used to schedule the interleaving without changing the kernel source. KASAN reported this decoded trace: BUG: KASAN: null-ptr-deref in tca_action_gd+0x5b9/0x1010 Read of size 4 at addr 0000000000000010 by task poc/150 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002 RIP: tca_action_gd+0x5c0/0x1010: arch_atomic_read at arch/x86/include/asm/atomic.h:23 raw_atomic_read at include/linux/atomic/atomic-arch-fallback.h:457 atomic_read at include/linux/atomic/atomic-instrumented.h:33 tcf_idr_delete_index at net/sched/act_api.c:766 tcf_action_delete at net/sched/act_api.c:1859 tcf_del_notify at net/sched/act_api.c:2014 tca_action_gd at net/sched/act_api.c:2064 R13: 0000000000000010 R15: fffffffffffffff0 Kernel panic - not syncing: Fatal exception R15 contains ERR_PTR(-EBUSY), and adding the tcfa_bindcnt offset produces the address in R13. With the guard applied, the same reproducer returned -ENOENT without a KASAN report or panic. Treat error pointers as absent and return -ENOENT.
References
Impacted products
Vendor Product Version
Linux Linux Version: 0190c1d452a91c38a3462abdd81752be1b9006a8
Version: 0190c1d452a91c38a3462abdd81752be1b9006a8
Version: 0190c1d452a91c38a3462abdd81752be1b9006a8
Version: 0190c1d452a91c38a3462abdd81752be1b9006a8
Version: 0190c1d452a91c38a3462abdd81752be1b9006a8
Version: 0190c1d452a91c38a3462abdd81752be1b9006a8
Version: 0190c1d452a91c38a3462abdd81752be1b9006a8
Version: 0190c1d452a91c38a3462abdd81752be1b9006a8
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{
  "containers": {
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          "programFiles": [
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:18:31.007Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/39b751a210bf61a374afa82749afc7a77a08bf1d"
        },
        {
          "url": "https://git.kernel.org/stable/c/dd80a7519824b72c8fcfd3cc50cb93f7e2d90923"
        },
        {
          "url": "https://git.kernel.org/stable/c/6bf076258aac4e0af69ef317656c31ce6444d647"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c9f07bf8800171de2cd3f02815cebe1f4d45f2d"
        },
        {
          "url": "https://git.kernel.org/stable/c/259caa711b7688365676442e2fdb286b8aceaa80"
        },
        {
          "url": "https://git.kernel.org/stable/c/968550a439f64bd1a6c0d88efb92e4f082f84a26"
        },
        {
          "url": "https://git.kernel.org/stable/c/a9551f26287debe6d8aa6e8841974661065b975f"
        },
        {
          "url": "https://git.kernel.org/stable/c/c82b797abe668d0b668601a93ba2c0b071a63574"
        }
      ],
      "title": "net/sched: reject IDR error pointers when deleting actions",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98380",
    "datePublished": "2026-10-09T07:34:20.218Z",
    "dateReserved": "2026-09-25T10:25:14.345Z",
    "dateUpdated": "2026-10-19T09:18:31.007Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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