CVE-2024-26635 (GCVE-0-2024-26635)

Vulnerability from cvelistv5 – Published: 2024-03-18 10:14 – Updated: 2025-05-04 08:52
VLAI?
Title
llc: Drop support for ETH_P_TR_802_2.
Summary
In the Linux kernel, the following vulnerability has been resolved: llc: Drop support for ETH_P_TR_802_2. syzbot reported an uninit-value bug below. [0] llc supports ETH_P_802_2 (0x0004) and used to support ETH_P_TR_802_2 (0x0011), and syzbot abused the latter to trigger the bug. write$tun(r0, &(0x7f0000000040)={@val={0x0, 0x11}, @val, @mpls={[], @llc={@snap={0xaa, 0x1, ')', "90e5dd"}}}}, 0x16) llc_conn_handler() initialises local variables {saddr,daddr}.mac based on skb in llc_pdu_decode_sa()/llc_pdu_decode_da() and passes them to __llc_lookup(). However, the initialisation is done only when skb->protocol is htons(ETH_P_802_2), otherwise, __llc_lookup_established() and __llc_lookup_listener() will read garbage. The missing initialisation existed prior to commit 211ed865108e ("net: delete all instances of special processing for token ring"). It removed the part to kick out the token ring stuff but forgot to close the door allowing ETH_P_TR_802_2 packets to sneak into llc_rcv(). Let's remove llc_tr_packet_type and complete the deprecation. [0]: BUG: KMSAN: uninit-value in __llc_lookup_established+0xe9d/0xf90 __llc_lookup_established+0xe9d/0xf90 __llc_lookup net/llc/llc_conn.c:611 [inline] llc_conn_handler+0x4bd/0x1360 net/llc/llc_conn.c:791 llc_rcv+0xfbb/0x14a0 net/llc/llc_input.c:206 __netif_receive_skb_one_core net/core/dev.c:5527 [inline] __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5641 netif_receive_skb_internal net/core/dev.c:5727 [inline] netif_receive_skb+0x58/0x660 net/core/dev.c:5786 tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1555 tun_get_user+0x53af/0x66d0 drivers/net/tun.c:2002 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048 call_write_iter include/linux/fs.h:2020 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x8ef/0x1490 fs/read_write.c:584 ksys_write+0x20f/0x4c0 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x93/0xd0 fs/read_write.c:646 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b Local variable daddr created at: llc_conn_handler+0x53/0x1360 net/llc/llc_conn.c:783 llc_rcv+0xfbb/0x14a0 net/llc/llc_input.c:206 CPU: 1 PID: 5004 Comm: syz-executor994 Not tainted 6.6.0-syzkaller-14500-g1c41041124bd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 211ed865108e24697b44bee5daac502ee6bdd4a4 , < 165ad1e22779685c3ed3dd349c6c4c632309cc62 (git)
Affected: 211ed865108e24697b44bee5daac502ee6bdd4a4 , < b8e8838f82f332ae80c643dbb1ca4418d0628097 (git)
Affected: 211ed865108e24697b44bee5daac502ee6bdd4a4 , < 9ccdef19cf9497c2803b005369668feb91cacdfd (git)
Affected: 211ed865108e24697b44bee5daac502ee6bdd4a4 , < c0fe2fe7a5a291dfcf6dc64301732c8d3dc6a828 (git)
Affected: 211ed865108e24697b44bee5daac502ee6bdd4a4 , < 660c3053d992b68fee893a0e9ec9159228cffdc6 (git)
Affected: 211ed865108e24697b44bee5daac502ee6bdd4a4 , < f1f34a515fb1e25e85dee94f781e7869ae351fb8 (git)
Affected: 211ed865108e24697b44bee5daac502ee6bdd4a4 , < df57fc2f2abf548aa889a36ab0bdcc94a75399dc (git)
Affected: 211ed865108e24697b44bee5daac502ee6bdd4a4 , < e3f9bed9bee261e3347131764e42aeedf1ffea61 (git)
Create a notification for this product.
    Linux Linux Affected: 3.5
Unaffected: 0 , < 3.5 (semver)
Unaffected: 4.19.307 , ≤ 4.19.* (semver)
Unaffected: 5.4.269 , ≤ 5.4.* (semver)
Unaffected: 5.10.210 , ≤ 5.10.* (semver)
Unaffected: 5.15.149 , ≤ 5.15.* (semver)
Unaffected: 6.1.76 , ≤ 6.1.* (semver)
Unaffected: 6.6.15 , ≤ 6.6.* (semver)
Unaffected: 6.7.3 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
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support for ETH_P_TR_802_2.\\n\\nsyzbot reported an uninit-value bug below. [0]\\n\\nllc supports ETH_P_802_2 (0x0004) and used to support ETH_P_TR_802_2\\n(0x0011), and syzbot abused the latter to trigger the bug.\\n\\n  write$tun(r0, \u0026(0x7f0000000040)={@val={0x0, 0x11}, @val, @mpls={[], @llc={@snap={0xaa, 0x1, \u0027)\u0027, \\\"90e5dd\\\"}}}}, 0x16)\\n\\nllc_conn_handler() initialises local variables {saddr,daddr}.mac\\nbased on skb in llc_pdu_decode_sa()/llc_pdu_decode_da() and passes\\nthem to __llc_lookup().\\n\\nHowever, the initialisation is done only when skb-\u003eprotocol is\\nhtons(ETH_P_802_2), otherwise, __llc_lookup_established() and\\n__llc_lookup_listener() will read garbage.\\n\\nThe missing initialisation existed prior to commit 211ed865108e\\n(\\\"net: delete all instances of special processing for token ring\\\").\\n\\nIt removed the part to kick out the token ring stuff but forgot to\\nclose the door allowing ETH_P_TR_802_2 packets to sneak into llc_rcv().\\n\\nLet\u0027s remove llc_tr_packet_type and complete the deprecation.\\n\\n[0]:\\nBUG: KMSAN: uninit-value in __llc_lookup_established+0xe9d/0xf90\\n __llc_lookup_established+0xe9d/0xf90\\n __llc_lookup net/llc/llc_conn.c:611 [inline]\\n llc_conn_handler+0x4bd/0x1360 net/llc/llc_conn.c:791\\n llc_rcv+0xfbb/0x14a0 net/llc/llc_input.c:206\\n __netif_receive_skb_one_core net/core/dev.c:5527 [inline]\\n __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5641\\n netif_receive_skb_internal net/core/dev.c:5727 [inline]\\n netif_receive_skb+0x58/0x660 net/core/dev.c:5786\\n tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1555\\n tun_get_user+0x53af/0x66d0 drivers/net/tun.c:2002\\n tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048\\n call_write_iter include/linux/fs.h:2020 [inline]\\n new_sync_write fs/read_write.c:491 [inline]\\n vfs_write+0x8ef/0x1490 fs/read_write.c:584\\n ksys_write+0x20f/0x4c0 fs/read_write.c:637\\n __do_sys_write fs/read_write.c:649 [inline]\\n __se_sys_write fs/read_write.c:646 [inline]\\n __x64_sys_write+0x93/0xd0 fs/read_write.c:646\\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\\n do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82\\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\\n\\nLocal variable daddr created at:\\n llc_conn_handler+0x53/0x1360 net/llc/llc_conn.c:783\\n llc_rcv+0xfbb/0x14a0 net/llc/llc_input.c:206\\n\\nCPU: 1 PID: 5004 Comm: syz-executor994 Not tainted 6.6.0-syzkaller-14500-g1c41041124bd #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.307\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.269\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.210\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.149\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.76\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.15\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.3\", \"versionStartIncluding\": \"3.5\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"3.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T08:52:47.059Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26635\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T08:52:47.059Z\", \"dateReserved\": \"2024-02-19T14:20:24.136Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-18T10:14:47.213Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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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.



Detection rules are retrieved from Rulezet.