CVE-2025-21925 (GCVE-0-2025-21925)

Vulnerability from cvelistv5 – Published: 2025-04-01 15:40 – Updated: 2025-11-03 19:39
VLAI?
Title
llc: do not use skb_get() before dev_queue_xmit()
Summary
In the Linux kernel, the following vulnerability has been resolved: llc: do not use skb_get() before dev_queue_xmit() syzbot is able to crash hosts [1], using llc and devices not supporting IFF_TX_SKB_SHARING. In this case, e1000 driver calls eth_skb_pad(), while the skb is shared. Simply replace skb_get() by skb_clone() in net/llc/llc_s_ac.c Note that e1000 driver might have an issue with pktgen, because it does not clear IFF_TX_SKB_SHARING, this is an orthogonal change. We need to audit other skb_get() uses in net/llc. [1] kernel BUG at net/core/skbuff.c:2178 ! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 UID: 0 PID: 16371 Comm: syz.2.2764 Not tainted 6.14.0-rc4-syzkaller-00052-gac9c34d1e45a #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:pskb_expand_head+0x6ce/0x1240 net/core/skbuff.c:2178 Call Trace: <TASK> __skb_pad+0x18a/0x610 net/core/skbuff.c:2466 __skb_put_padto include/linux/skbuff.h:3843 [inline] skb_put_padto include/linux/skbuff.h:3862 [inline] eth_skb_pad include/linux/etherdevice.h:656 [inline] e1000_xmit_frame+0x2d99/0x5800 drivers/net/ethernet/intel/e1000/e1000_main.c:3128 __netdev_start_xmit include/linux/netdevice.h:5151 [inline] netdev_start_xmit include/linux/netdevice.h:5160 [inline] xmit_one net/core/dev.c:3806 [inline] dev_hard_start_xmit+0x9a/0x7b0 net/core/dev.c:3822 sch_direct_xmit+0x1ae/0xc30 net/sched/sch_generic.c:343 __dev_xmit_skb net/core/dev.c:4045 [inline] __dev_queue_xmit+0x13d4/0x43e0 net/core/dev.c:4621 dev_queue_xmit include/linux/netdevice.h:3313 [inline] llc_sap_action_send_test_c+0x268/0x320 net/llc/llc_s_ac.c:144 llc_exec_sap_trans_actions net/llc/llc_sap.c:153 [inline] llc_sap_next_state net/llc/llc_sap.c:182 [inline] llc_sap_state_process+0x239/0x510 net/llc/llc_sap.c:209 llc_ui_sendmsg+0xd0d/0x14e0 net/llc/af_llc.c:993 sock_sendmsg_nosec net/socket.c:718 [inline]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cd1c44327bbbd50fc24f2b38892f5f328b784d0f (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 13f3f872627f0f27c31245524fc11367756240ad (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9b6f083db141ece0024be01526aa05aa978811cb (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 17f86e25431ebc15aa9245ff156414fdad47822d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 416e8b4c20c6398044e93008deefd563289f477d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0f764208dc24ea043c3e20194d32aebf94f8459c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 056e8a46d79e22983bae4267e0d9c52927076f46 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 64e6a754d33d31aa844b3ee66fb93ac84ca1565e (git)
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    Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.4.291 , ≤ 5.4.* (semver)
Unaffected: 5.10.235 , ≤ 5.10.* (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.131 , ≤ 6.1.* (semver)
Unaffected: 6.6.83 , ≤ 6.6.* (semver)
Unaffected: 6.12.19 , ≤ 6.12.* (semver)
Unaffected: 6.13.7 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
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            "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nllc: do not use skb_get() before dev_queue_xmit()\n\nsyzbot is able to crash hosts [1], using llc and devices\nnot supporting IFF_TX_SKB_SHARING.\n\nIn this case, e1000 driver calls eth_skb_pad(), while\nthe skb is shared.\n\nSimply replace skb_get() by skb_clone() in net/llc/llc_s_ac.c\n\nNote that e1000 driver might have an issue with pktgen,\nbecause it does not clear IFF_TX_SKB_SHARING, this is an\northogonal change.\n\nWe need to audit other skb_get() uses in net/llc.\n\n[1]\n\nkernel BUG at net/core/skbuff.c:2178 !\nOops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI\nCPU: 0 UID: 0 PID: 16371 Comm: syz.2.2764 Not tainted 6.14.0-rc4-syzkaller-00052-gac9c34d1e45a #0\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\n RIP: 0010:pskb_expand_head+0x6ce/0x1240 net/core/skbuff.c:2178\nCall Trace:\n \u003cTASK\u003e\n  __skb_pad+0x18a/0x610 net/core/skbuff.c:2466\n  __skb_put_padto include/linux/skbuff.h:3843 [inline]\n  skb_put_padto include/linux/skbuff.h:3862 [inline]\n  eth_skb_pad include/linux/etherdevice.h:656 [inline]\n  e1000_xmit_frame+0x2d99/0x5800 drivers/net/ethernet/intel/e1000/e1000_main.c:3128\n  __netdev_start_xmit include/linux/netdevice.h:5151 [inline]\n  netdev_start_xmit include/linux/netdevice.h:5160 [inline]\n  xmit_one net/core/dev.c:3806 [inline]\n  dev_hard_start_xmit+0x9a/0x7b0 net/core/dev.c:3822\n  sch_direct_xmit+0x1ae/0xc30 net/sched/sch_generic.c:343\n  __dev_xmit_skb net/core/dev.c:4045 [inline]\n  __dev_queue_xmit+0x13d4/0x43e0 net/core/dev.c:4621\n  dev_queue_xmit include/linux/netdevice.h:3313 [inline]\n  llc_sap_action_send_test_c+0x268/0x320 net/llc/llc_s_ac.c:144\n  llc_exec_sap_trans_actions net/llc/llc_sap.c:153 [inline]\n  llc_sap_next_state net/llc/llc_sap.c:182 [inline]\n  llc_sap_state_process+0x239/0x510 net/llc/llc_sap.c:209\n  llc_ui_sendmsg+0xd0d/0x14e0 net/llc/af_llc.c:993\n  sock_sendmsg_nosec net/socket.c:718 [inline]"
        }
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      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:24:41.978Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cd1c44327bbbd50fc24f2b38892f5f328b784d0f"
        },
        {
          "url": "https://git.kernel.org/stable/c/13f3f872627f0f27c31245524fc11367756240ad"
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        {
          "url": "https://git.kernel.org/stable/c/9b6f083db141ece0024be01526aa05aa978811cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/17f86e25431ebc15aa9245ff156414fdad47822d"
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          "url": "https://git.kernel.org/stable/c/416e8b4c20c6398044e93008deefd563289f477d"
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        {
          "url": "https://git.kernel.org/stable/c/056e8a46d79e22983bae4267e0d9c52927076f46"
        },
        {
          "url": "https://git.kernel.org/stable/c/64e6a754d33d31aa844b3ee66fb93ac84ca1565e"
        }
      ],
      "title": "llc: do not use skb_get() before dev_queue_xmit()",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21925",
    "datePublished": "2025-04-01T15:40:57.355Z",
    "dateReserved": "2024-12-29T08:45:45.788Z",
    "dateUpdated": "2025-11-03T19:39:20.756Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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Sightings

Author Source Type Date

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.



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