CVE-2026-52943 (GCVE-0-2026-52943)
Vulnerability from cvelistv5
Published
2026-06-24 09:00
Modified
2026-10-19 19:47
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: skbuff: fix missing zerocopy reference in pskb_carve helpers pskb_carve_inside_header() and pskb_carve_inside_nonlinear() both copy the old skb_shared_info header into a new buffer via memcpy(), which includes the destructor_arg pointer (uarg) for MSG_ZEROCOPY skbs. Neither function calls net_zcopy_get() for the new shinfo, creating an unaccounted holder: every skb_shared_info with destructor_arg set will call skb_zcopy_clear() once when freed, but the corresponding net_zcopy_get() was never called for the new copy. Repeated calls drive uarg->refcnt to zero prematurely, freeing ubuf_info_msgzc while TX skbs still hold live destructor_arg pointers. KASAN reports use-after-free on a freed ubuf_info_msgzc: BUG: KASAN: slab-use-after-free in skb_release_data+0x77b/0x810 Read of size 8 at addr ffff88801574d3e8 by task poc/220 Call Trace: skb_release_data+0x77b/0x810 kfree_skb_list_reason+0x13e/0x610 skb_release_data+0x4cd/0x810 sk_skb_reason_drop+0xf3/0x340 skb_queue_purge_reason+0x282/0x440 rds_tcp_inc_free+0x1e/0x30 rds_recvmsg+0x354/0x1780 __sys_recvmsg+0xdf/0x180 Allocated by task 219: msg_zerocopy_realloc+0x157/0x7b0 tcp_sendmsg_locked+0x2892/0x3ba0 Freed by task 219: ip_recv_error+0x74a/0xb10 tcp_recvmsg+0x475/0x530 The skb consuming the late access still referenced the same uarg via shinfo->destructor_arg copied by pskb_carve_inside_nonlinear() without a refcount bump. This has been verified to be reliably exploitable: a working proof-of-concept achieves full root privilege escalation from an unprivileged local user on a default kernel configuration. The fix follows the pattern of pskb_expand_head() which has the same memcpy/cloned structure. For pskb_carve_inside_header(), net_zcopy_get() is placed after skb_orphan_frags() succeeds, so the orphan error path needs no cleanup. For pskb_carve_inside_nonlinear(), net_zcopy_get() is placed after all failure points and just before skb_release_data(), so no error path needs cleanup at all -- matching pskb_expand_head() more closely and avoiding the need for a balancing net_zcopy_put().
References
Impacted products
Vendor Product Version
Linux Linux Version: 6fa01ccd883021105e9f8af7d04b9f156fa3494a
Version: 6fa01ccd883021105e9f8af7d04b9f156fa3494a
Version: 6fa01ccd883021105e9f8af7d04b9f156fa3494a
Version: 6fa01ccd883021105e9f8af7d04b9f156fa3494a
Version: 6fa01ccd883021105e9f8af7d04b9f156fa3494a
Version: 6fa01ccd883021105e9f8af7d04b9f156fa3494a
Version: 6fa01ccd883021105e9f8af7d04b9f156fa3494a
Version: 6fa01ccd883021105e9f8af7d04b9f156fa3494a
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              "value": "AV:L - The vulnerable zerocopy state is created by a local process using TCP MSG_ZEROCOPY; remote RDS/TCP packets can reach pskb_extract() but do not carry local ubuf_info destructor_arg state. A local unprivileged attacker can connect to the in-kernel RDS/TCP listener and send crafted zerocopy TCP data.\nAC:L - The fix commit states the issue is reliably exploitable with a working proof-of-concept, and the trigger is a deterministic missing reference count rather than an attacker-uncontrolled race. The attacker controls the local TCP connection, message layout, zerocopy sends, and repeated triggering.\nPR:L - The attack requires the ability to run local unprivileged code and create ordinary TCP sockets with SO_ZEROCOPY/MSG_ZEROCOPY, which has no capability check. No real root or init-namespace administrative privilege is required.\nUI:N - No victim user action is required once the local attacker runs the exploit. The attacker directly drives the socket operations and RDS/TCP receive path.\nS:U - The vulnerability is exploited within the kernel and impacts the same kernel security authority. It is a standard local kernel privilege escalation, not a VM escape or cross-scope boundary violation.\nC:H - This is a use-after-free of ubuf_info_msgzc reachable through skb zerocopy cleanup, and the fix commit confirms a working full root privilege-escalation exploit. Such kernel UAF exploitation can provide access to protected kernel and process memory.\nI:H - The stale ubuf_info pointer is later dereferenced through zerocopy completion handling, giving a memory-corruption primitive suitable for control-flow or credential manipulation. The reported exploit achieves full root privilege escalation.\nA:H - The bug produces a KASAN-confirmed slab use-after-free in skb_release_data() and can crash the kernel during skb cleanup. Even without full exploitation, repeated triggering can cause kernel oops/panic-level denial of service."
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A local unprivileged attacker can connect to the in-kernel RDS/TCP listener and send crafted zerocopy TCP data.\\nAC:L - The fix commit states the issue is reliably exploitable with a working proof-of-concept, and the trigger is a deterministic missing reference count rather than an attacker-uncontrolled race. The attacker controls the local TCP connection, message layout, zerocopy sends, and repeated triggering.\\nPR:L - The attack requires the ability to run local unprivileged code and create ordinary TCP sockets with SO_ZEROCOPY/MSG_ZEROCOPY, which has no capability check. No real root or init-namespace administrative privilege is required.\\nUI:N - No victim user action is required once the local attacker runs the exploit. The attacker directly drives the socket operations and RDS/TCP receive path.\\nS:U - The vulnerability is exploited within the kernel and impacts the same kernel security authority. It is a standard local kernel privilege escalation, not a VM escape or cross-scope boundary violation.\\nC:H - This is a use-after-free of ubuf_info_msgzc reachable through skb zerocopy cleanup, and the fix commit confirms a working full root privilege-escalation exploit. Such kernel UAF exploitation can provide access to protected kernel and process memory.\\nI:H - The stale ubuf_info pointer is later dereferenced through zerocopy completion handling, giving a memory-corruption primitive suitable for control-flow or credential manipulation. The reported exploit achieves full root privilege escalation.\\nA:H - The bug produces a KASAN-confirmed slab use-after-free in skb_release_data() and can crash the kernel during skb cleanup. 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Repeated calls\\ndrive uarg-\u003erefcnt to zero prematurely, freeing ubuf_info_msgzc while\\nTX skbs still hold live destructor_arg pointers.\\n\\nKASAN reports use-after-free on a freed ubuf_info_msgzc:\\n\\n  BUG: KASAN: slab-use-after-free in skb_release_data+0x77b/0x810\\n  Read of size 8 at addr ffff88801574d3e8 by task poc/220\\n\\n  Call Trace:\\n   skb_release_data+0x77b/0x810\\n   kfree_skb_list_reason+0x13e/0x610\\n   skb_release_data+0x4cd/0x810\\n   sk_skb_reason_drop+0xf3/0x340\\n   skb_queue_purge_reason+0x282/0x440\\n   rds_tcp_inc_free+0x1e/0x30\\n   rds_recvmsg+0x354/0x1780\\n   __sys_recvmsg+0xdf/0x180\\n\\n  Allocated by task 219:\\n   msg_zerocopy_realloc+0x157/0x7b0\\n   tcp_sendmsg_locked+0x2892/0x3ba0\\n\\n  Freed by task 219:\\n   ip_recv_error+0x74a/0xb10\\n   tcp_recvmsg+0x475/0x530\\n\\nThe skb consuming the late access still referenced the same uarg via\\nshinfo-\u003edestructor_arg copied by pskb_carve_inside_nonlinear() without\\na refcount bump. 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For pskb_carve_inside_nonlinear(), net_zcopy_get() is\\nplaced after all failure points and just before skb_release_data(), so\\nno error path needs cleanup at all -- matching pskb_expand_head() more\\nclosely and avoiding the need for a balancing net_zcopy_put().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.259\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.210\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.176\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.143\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.93\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.35\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0.12\", \"versionStartIncluding\": \"4.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1\", \"versionStartIncluding\": \"4.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:31:55.528Z\"}}}",
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}


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