CVE-2026-53080 (GCVE-0-2026-53080)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-06-24 16:30
VLAI
Title
net/sched: cls_fw: fix NULL dereference of "old" filters before change()
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_fw: fix NULL dereference of "old" filters before change() Like pointed out by Sashiko [1], since commit ed76f5edccc9 ("net: sched: protect filter_chain list with filter_chain_lock mutex") TC filters are added to a shared block and published to datapath before their ->change() function is called. This is a problem for cls_fw: an invalid filter created with the "old" method can still classify some packets before it is destroyed by the validation logic added by Xiang. Therefore, insisting with repeated runs of the following script: # ip link add dev crash0 type dummy # ip link set dev crash0 up # mausezahn crash0 -c 100000 -P 10 \ > -A 4.3.2.1 -B 1.2.3.4 -t udp "dp=1234" -q & # sleep 1 # tc qdisc add dev crash0 egress_block 1 clsact # tc filter add block 1 protocol ip prio 1 matchall \ > action skbedit mark 65536 continue # tc filter add block 1 protocol ip prio 2 fw # ip link del dev crash0 can still make fw_classify() hit the WARN_ON() in [2]: WARNING: ./include/net/pkt_cls.h:88 at fw_classify+0x244/0x250 [cls_fw], CPU#18: mausezahn/1399 Modules linked in: cls_fw(E) act_skbedit(E) CPU: 18 UID: 0 PID: 1399 Comm: mausezahn Tainted: G E 7.0.0-rc6-virtme #17 PREEMPT(full) Tainted: [E]=UNSIGNED_MODULE Hardware name: Red Hat KVM, BIOS 1.16.3-2.el9 04/01/2014 RIP: 0010:fw_classify+0x244/0x250 [cls_fw] Code: 5c 49 c7 45 00 00 00 00 00 41 5d 41 5e 41 5f 5d c3 cc cc cc cc 5b b8 ff ff ff ff 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc 90 <0f> 0b 90 eb a0 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffd1b7026bf8a8 EFLAGS: 00010202 RAX: ffff8c5ac9c60800 RBX: ffff8c5ac99322c0 RCX: 0000000000000004 RDX: 0000000000000001 RSI: ffff8c5b74d7a000 RDI: ffff8c5ac8284f40 RBP: ffffd1b7026bf8d0 R08: 0000000000000000 R09: ffffd1b7026bf9b0 R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000010000 R13: ffffd1b7026bf930 R14: ffff8c5ac8284f40 R15: 0000000000000000 FS: 00007fca40c37740(0000) GS:ffff8c5b74d7a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fca40e822a0 CR3: 0000000005ca0001 CR4: 0000000000172ef0 Call Trace: <TASK> tcf_classify+0x17d/0x5c0 tc_run+0x9d/0x150 __dev_queue_xmit+0x2ab/0x14d0 ip_finish_output2+0x340/0x8f0 ip_output+0xa4/0x250 raw_sendmsg+0x147d/0x14b0 __sys_sendto+0x1cc/0x1f0 __x64_sys_sendto+0x24/0x30 do_syscall_64+0x126/0xf80 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fca40e822ba Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89 RSP: 002b:00007ffc248a42c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 000055ef233289d0 RCX: 00007fca40e822ba RDX: 000000000000001e RSI: 000055ef23328c30 RDI: 0000000000000003 RBP: 000055ef233289d0 R08: 00007ffc248a42d0 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000001e R13: 00000000000186a0 R14: 0000000000000000 R15: 00007fca41043000 </TASK> irq event stamp: 1045778 hardirqs last enabled at (1045784): [<ffffffff864ec042>] __up_console_sem+0x52/0x60 hardirqs last disabled at (1045789): [<ffffffff864ec027>] __up_console_sem+0x37/0x60 softirqs last enabled at (1045426): [<ffffffff874d48c7>] __alloc_skb+0x207/0x260 softirqs last disabled at (1045434): [<ffffffff874fe8f8>] __dev_queue_xmit+0x78/0x14d0 Then, because of the value in the packet's mark, dereference on 'q->handle' with NULL 'q' occurs: BUG: kernel NULL pointer dereference, address: 0000000000000038 [...] RIP: 0010:fw_classify+0x1fe/0x250 [cls_fw] [...] Skip "old-style" classification on shared blocks, so that the NULL dereference is fixed and WARN_ON() is not hit anymore in the short lifetime of invalid cls_fw "old-style" filters. [1] https://sashiko.dev/#/patchset/2 ---truncated---
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ed76f5edccc98fa66f2337f0b3b255d6e1a568b7 , < a719275da488835e987d28effc04679b4aace3a0 (git)
Affected: ed76f5edccc98fa66f2337f0b3b255d6e1a568b7 , < c205da704c84eeb4247d770150440294fd547049 (git)
Affected: ed76f5edccc98fa66f2337f0b3b255d6e1a568b7 , < 5dcce34c57d5e5990869384d69deeb9414bf9b92 (git)
Affected: ed76f5edccc98fa66f2337f0b3b255d6e1a568b7 , < 5df49f0579f7e625f2358a219d31fbc7621be799 (git)
Affected: ed76f5edccc98fa66f2337f0b3b255d6e1a568b7 , < 829808cbf8cf8a6d07a0e67a5ea2c3fcd63a9e5c (git)
Affected: ed76f5edccc98fa66f2337f0b3b255d6e1a568b7 , < 41845bc5bb64f3d615abe575ad655b5e7f193634 (git)
Affected: ed76f5edccc98fa66f2337f0b3b255d6e1a568b7 , < 4fabcfea7a9dd159df32c5df6587fe858cb0d748 (git)
Affected: ed76f5edccc98fa66f2337f0b3b255d6e1a568b7 , < 65782b2db7321d5f97c16718c4c7f6c7205a56be (git)
Create a notification for this product.
Linux Linux Affected: 5.1
Unaffected: 0 , < 5.1 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.93",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_fw: fix NULL dereference of \"old\" filters before change()\n\nLike pointed out by Sashiko [1], since commit ed76f5edccc9 (\"net: sched:\nprotect filter_chain list with filter_chain_lock mutex\") TC filters are\nadded to a shared block and published to datapath before their -\u003echange()\nfunction is called. This is a problem for cls_fw: an invalid filter\ncreated with the \"old\" method can still classify some packets before it\nis destroyed by the validation logic added by Xiang.\nTherefore, insisting with repeated runs of the following script:\n\n # ip link add dev crash0 type dummy\n # ip link set dev crash0 up\n # mausezahn  crash0 -c 100000 -P 10 \\\n \u003e -A 4.3.2.1 -B 1.2.3.4 -t udp \"dp=1234\" -q \u0026\n # sleep 1\n # tc qdisc add dev crash0 egress_block 1 clsact\n # tc filter add block 1 protocol ip prio 1 matchall \\\n \u003e action skbedit mark 65536 continue\n # tc filter add block 1 protocol ip prio 2 fw\n # ip link del dev crash0\n\ncan still make fw_classify() hit the WARN_ON() in [2]:\n\n WARNING: ./include/net/pkt_cls.h:88 at fw_classify+0x244/0x250 [cls_fw], CPU#18: mausezahn/1399\n Modules linked in: cls_fw(E) act_skbedit(E)\n CPU: 18 UID: 0 PID: 1399 Comm: mausezahn Tainted: G            E       7.0.0-rc6-virtme #17 PREEMPT(full)\n Tainted: [E]=UNSIGNED_MODULE\n Hardware name: Red Hat KVM, BIOS 1.16.3-2.el9 04/01/2014\n RIP: 0010:fw_classify+0x244/0x250 [cls_fw]\n Code: 5c 49 c7 45 00 00 00 00 00 41 5d 41 5e 41 5f 5d c3 cc cc cc cc 5b b8 ff ff ff ff 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc 90 \u003c0f\u003e 0b 90 eb a0 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90\n RSP: 0018:ffffd1b7026bf8a8 EFLAGS: 00010202\n RAX: ffff8c5ac9c60800 RBX: ffff8c5ac99322c0 RCX: 0000000000000004\n RDX: 0000000000000001 RSI: ffff8c5b74d7a000 RDI: ffff8c5ac8284f40\n RBP: ffffd1b7026bf8d0 R08: 0000000000000000 R09: ffffd1b7026bf9b0\n R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000010000\n R13: ffffd1b7026bf930 R14: ffff8c5ac8284f40 R15: 0000000000000000\n FS:  00007fca40c37740(0000) GS:ffff8c5b74d7a000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007fca40e822a0 CR3: 0000000005ca0001 CR4: 0000000000172ef0\n Call Trace:\n  \u003cTASK\u003e\n  tcf_classify+0x17d/0x5c0\n  tc_run+0x9d/0x150\n  __dev_queue_xmit+0x2ab/0x14d0\n  ip_finish_output2+0x340/0x8f0\n  ip_output+0xa4/0x250\n  raw_sendmsg+0x147d/0x14b0\n  __sys_sendto+0x1cc/0x1f0\n  __x64_sys_sendto+0x24/0x30\n  do_syscall_64+0x126/0xf80\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n RIP: 0033:0x7fca40e822ba\n Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89\n RSP: 002b:00007ffc248a42c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c\n RAX: ffffffffffffffda RBX: 000055ef233289d0 RCX: 00007fca40e822ba\n RDX: 000000000000001e RSI: 000055ef23328c30 RDI: 0000000000000003\n RBP: 000055ef233289d0 R08: 00007ffc248a42d0 R09: 0000000000000010\n R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000001e\n R13: 00000000000186a0 R14: 0000000000000000 R15: 00007fca41043000\n  \u003c/TASK\u003e\n irq event stamp: 1045778\n hardirqs last  enabled at (1045784): [\u003cffffffff864ec042\u003e] __up_console_sem+0x52/0x60\n hardirqs last disabled at (1045789): [\u003cffffffff864ec027\u003e] __up_console_sem+0x37/0x60\n softirqs last  enabled at (1045426): [\u003cffffffff874d48c7\u003e] __alloc_skb+0x207/0x260\n softirqs last disabled at (1045434): [\u003cffffffff874fe8f8\u003e] __dev_queue_xmit+0x78/0x14d0\n\nThen, because of the value in the packet\u0027s mark, dereference on \u0027q-\u003ehandle\u0027\nwith NULL \u0027q\u0027 occurs:\n\n BUG: kernel NULL  pointer dereference, address: 0000000000000038\n [...]\n RIP: 0010:fw_classify+0x1fe/0x250 [cls_fw]\n [...]\n\nSkip \"old-style\" classification on shared blocks, so that the NULL\ndereference is fixed and WARN_ON() is not hit anymore in the short\nlifetime of invalid cls_fw \"old-style\" filters.\n\n[1] https://sashiko.dev/#/patchset/2\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T16:30:21.172Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a719275da488835e987d28effc04679b4aace3a0"
        },
        {
          "url": "https://git.kernel.org/stable/c/c205da704c84eeb4247d770150440294fd547049"
        },
        {
          "url": "https://git.kernel.org/stable/c/5dcce34c57d5e5990869384d69deeb9414bf9b92"
        },
        {
          "url": "https://git.kernel.org/stable/c/5df49f0579f7e625f2358a219d31fbc7621be799"
        },
        {
          "url": "https://git.kernel.org/stable/c/829808cbf8cf8a6d07a0e67a5ea2c3fcd63a9e5c"
        },
        {
          "url": "https://git.kernel.org/stable/c/41845bc5bb64f3d615abe575ad655b5e7f193634"
        },
        {
          "url": "https://git.kernel.org/stable/c/4fabcfea7a9dd159df32c5df6587fe858cb0d748"
        },
        {
          "url": "https://git.kernel.org/stable/c/65782b2db7321d5f97c16718c4c7f6c7205a56be"
        }
      ],
      "title": "net/sched: cls_fw: fix NULL dereference of \"old\" filters before change()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53080",
    "datePublished": "2026-06-24T16:30:21.172Z",
    "dateReserved": "2026-06-09T07:44:35.383Z",
    "dateUpdated": "2026-06-24T16:30:21.172Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-53080",
      "date": "2026-08-05",
      "epss": "0.00114",
      "percentile": "0.01746"
    },
    "microsoft_vex": {
      "current_release_date": "2026-06-28T01:42:19.000Z",
      "cve": "CVE-2026-53080",
      "id": "msrc_CVE-2026-53080",
      "initial_release_date": "2026-06-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net/sched: cls_fw: fix NULL dereference of \"old\" filters before change()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-53080.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53080\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-24T17:17:22.047\",\"lastModified\":\"2026-07-23T18:37:57.043\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/sched: cls_fw: fix NULL dereference of \\\"old\\\" filters before change()\\n\\nLike pointed out by Sashiko [1], since commit ed76f5edccc9 (\\\"net: sched:\\nprotect filter_chain list with filter_chain_lock mutex\\\") TC filters are\\nadded to a shared block and published to datapath before their -\u003echange()\\nfunction is called. This is a problem for cls_fw: an invalid filter\\ncreated with the \\\"old\\\" method can still classify some packets before it\\nis destroyed by the validation logic added by Xiang.\\nTherefore, insisting with repeated runs of the following script:\\n\\n # ip link add dev crash0 type dummy\\n # ip link set dev crash0 up\\n # mausezahn  crash0 -c 100000 -P 10 \\\\\\n \u003e -A 4.3.2.1 -B 1.2.3.4 -t udp \\\"dp=1234\\\" -q \u0026\\n # sleep 1\\n # tc qdisc add dev crash0 egress_block 1 clsact\\n # tc filter add block 1 protocol ip prio 1 matchall \\\\\\n \u003e action skbedit mark 65536 continue\\n # tc filter add block 1 protocol ip prio 2 fw\\n # ip link del dev crash0\\n\\ncan still make fw_classify() hit the WARN_ON() in [2]:\\n\\n WARNING: ./include/net/pkt_cls.h:88 at fw_classify+0x244/0x250 [cls_fw], CPU#18: mausezahn/1399\\n Modules linked in: cls_fw(E) act_skbedit(E)\\n CPU: 18 UID: 0 PID: 1399 Comm: mausezahn Tainted: G            E       7.0.0-rc6-virtme #17 PREEMPT(full)\\n Tainted: [E]=UNSIGNED_MODULE\\n Hardware name: Red Hat KVM, BIOS 1.16.3-2.el9 04/01/2014\\n RIP: 0010:fw_classify+0x244/0x250 [cls_fw]\\n Code: 5c 49 c7 45 00 00 00 00 00 41 5d 41 5e 41 5f 5d c3 cc cc cc cc 5b b8 ff ff ff ff 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc 90 \u003c0f\u003e 0b 90 eb a0 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90\\n RSP: 0018:ffffd1b7026bf8a8 EFLAGS: 00010202\\n RAX: ffff8c5ac9c60800 RBX: ffff8c5ac99322c0 RCX: 0000000000000004\\n RDX: 0000000000000001 RSI: ffff8c5b74d7a000 RDI: ffff8c5ac8284f40\\n RBP: ffffd1b7026bf8d0 R08: 0000000000000000 R09: ffffd1b7026bf9b0\\n R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000010000\\n R13: ffffd1b7026bf930 R14: ffff8c5ac8284f40 R15: 0000000000000000\\n FS:  00007fca40c37740(0000) GS:ffff8c5b74d7a000(0000) knlGS:0000000000000000\\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n CR2: 00007fca40e822a0 CR3: 0000000005ca0001 CR4: 0000000000172ef0\\n Call Trace:\\n  \u003cTASK\u003e\\n  tcf_classify+0x17d/0x5c0\\n  tc_run+0x9d/0x150\\n  __dev_queue_xmit+0x2ab/0x14d0\\n  ip_finish_output2+0x340/0x8f0\\n  ip_output+0xa4/0x250\\n  raw_sendmsg+0x147d/0x14b0\\n  __sys_sendto+0x1cc/0x1f0\\n  __x64_sys_sendto+0x24/0x30\\n  do_syscall_64+0x126/0xf80\\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\\n RIP: 0033:0x7fca40e822ba\\n Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89\\n RSP: 002b:00007ffc248a42c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c\\n RAX: ffffffffffffffda RBX: 000055ef233289d0 RCX: 00007fca40e822ba\\n RDX: 000000000000001e RSI: 000055ef23328c30 RDI: 0000000000000003\\n RBP: 000055ef233289d0 R08: 00007ffc248a42d0 R09: 0000000000000010\\n R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000001e\\n R13: 00000000000186a0 R14: 0000000000000000 R15: 00007fca41043000\\n  \u003c/TASK\u003e\\n irq event stamp: 1045778\\n hardirqs last  enabled at (1045784): [\u003cffffffff864ec042\u003e] __up_console_sem+0x52/0x60\\n hardirqs last disabled at (1045789): [\u003cffffffff864ec027\u003e] __up_console_sem+0x37/0x60\\n softirqs last  enabled at (1045426): [\u003cffffffff874d48c7\u003e] __alloc_skb+0x207/0x260\\n softirqs last disabled at (1045434): [\u003cffffffff874fe8f8\u003e] __dev_queue_xmit+0x78/0x14d0\\n\\nThen, because of the value in the packet\u0027s mark, dereference on \u0027q-\u003ehandle\u0027\\nwith NULL \u0027q\u0027 occurs:\\n\\n BUG: kernel NULL  pointer dereference, address: 0000000000000038\\n [...]\\n RIP: 0010:fw_classify+0x1fe/0x250 [cls_fw]\\n [...]\\n\\nSkip \\\"old-style\\\" classification on shared blocks, so that the NULL\\ndereference is fixed and WARN_ON() is not hit anymore in the short\\nlifetime of invalid cls_fw \\\"old-style\\\" filters.\\n\\n[1] https://sashiko.dev/#/patchset/2\\n---truncated---\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/sched/cls_fw.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ed76f5edccc98fa66f2337f0b3b255d6e1a568b7\",\"lessThan\":\"a719275da488835e987d28effc04679b4aace3a0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed76f5edccc98fa66f2337f0b3b255d6e1a568b7\",\"lessThan\":\"c205da704c84eeb4247d770150440294fd547049\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed76f5edccc98fa66f2337f0b3b255d6e1a568b7\",\"lessThan\":\"5dcce34c57d5e5990869384d69deeb9414bf9b92\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed76f5edccc98fa66f2337f0b3b255d6e1a568b7\",\"lessThan\":\"5df49f0579f7e625f2358a219d31fbc7621be799\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed76f5edccc98fa66f2337f0b3b255d6e1a568b7\",\"lessThan\":\"829808cbf8cf8a6d07a0e67a5ea2c3fcd63a9e5c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed76f5edccc98fa66f2337f0b3b255d6e1a568b7\",\"lessThan\":\"41845bc5bb64f3d615abe575ad655b5e7f193634\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed76f5edccc98fa66f2337f0b3b255d6e1a568b7\",\"lessThan\":\"4fabcfea7a9dd159df32c5df6587fe858cb0d748\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ed76f5edccc98fa66f2337f0b3b255d6e1a568b7\",\"lessThan\":\"65782b2db7321d5f97c16718c4c7f6c7205a56be\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/sched/cls_fw.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.1\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.1\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.93\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.35\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.1\",\"versionEndExcluding\":\"5.10.259\",\"matchCriteriaId\":\"D324C6F1-A3BA-4A53-9D3F-59A846597A5E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.210\",\"matchCriteriaId\":\"5E938CDF-D1C4-43D0-98DC-9E11B6B55801\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.176\",\"matchCriteriaId\":\"C4446623-5F2B-4DD8-8666-9FAAC285A757\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.143\",\"matchCriteriaId\":\"9062F1CD-CAD6-4EA2-A73F-C06D4A887B8C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.93\",\"matchCriteriaId\":\"1E73413E-0629-41AA-A4D3-5A3D10A0BD63\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.35\",\"matchCriteriaId\":\"0FCCB23A-7629-4386-93B6-B119237C4382\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.0.10\",\"matchCriteriaId\":\"A13475D2-59BF-4716-94B5-7C1D239A2CF4\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/41845bc5bb64f3d615abe575ad655b5e7f193634\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4fabcfea7a9dd159df32c5df6587fe858cb0d748\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5dcce34c57d5e5990869384d69deeb9414bf9b92\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5df49f0579f7e625f2358a219d31fbc7621be799\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/65782b2db7321d5f97c16718c4c7f6c7205a56be\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/829808cbf8cf8a6d07a0e67a5ea2c3fcd63a9e5c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a719275da488835e987d28effc04679b4aace3a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c205da704c84eeb4247d770150440294fd547049\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-23T18:41:17+00:00",
      "cve": "CVE-2026-53080",
      "id": "CVE-2026-53080",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/sched: cls_fw: fix NULL dereference of \"old\" filters before change()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53080.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-21T23:51:10Z",
      "cve": "CVE-2026-53080",
      "id": "CVE-2026-53080",
      "initial_release_date": "2026-06-26T02:12:49Z",
      "product_status:known_affected": "144",
      "product_status:known_not_affected": "92",
      "product_status:recommended": "98",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53080",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53080.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.