{"id":"CVE-2026-52943","state":"PUBLISHED","title":"net: skbuff: fix missing zerocopy reference in pskb_carve helpers","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: fix missing zerocopy reference in pskb_carve helpers\n\npskb_carve_inside_header() and pskb_carve_inside_nonlinear() both copy\nthe old skb_shared_info header into a new buffer via memcpy(), which\nincludes the destructor_arg pointer (uarg) for MSG_ZEROCOPY skbs.\nNeither function calls net_zcopy_get() for the new shinfo, creating an\nunaccounted holder: every skb_shared_info with destructor_arg set will\ncall skb_zcopy_clear() once when freed, but the corresponding\nnet_zcopy_get() was never called for the new copy. Repeated calls\ndrive uarg->refcnt 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->destructor_arg copied by pskb_carve_inside_nonlinear() without\na refcount bump. This has been verified to be reliably exploitable: a\nworking proof-of-concept achieves full root privilege escalation from\nan unprivileged local user on a default kernel configuration.\n\nThe fix follows the pattern of pskb_expand_head() which has the same\nmemcpy/cloned structure. For pskb_carve_inside_header(), net_zcopy_get()\nis placed after skb_orphan_frags() succeeds, so the orphan error path\nneeds no cleanup. 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().","publishedAt":"2026-06-24T09:00:12.292Z","updatedAt":"2026-10-19T19:47:08.739Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6fa01ccd883021105e9f8af7d04b9f156fa3494a","status":"affected","lessThan":"8dbed691e43a50903658130bde0fcb5abc425b37","versionType":"git"},{"version":"6fa01ccd883021105e9f8af7d04b9f156fa3494a","status":"affected","lessThan":"9b40bdc2a3298225dffab8158208a0d8c6300578","versionType":"git"},{"version":"6fa01ccd883021105e9f8af7d04b9f156fa3494a","status":"affected","lessThan":"fd470f0a97b8e9a125f520265d2f3b088ffb5b8a","versionType":"git"},{"version":"6fa01ccd883021105e9f8af7d04b9f156fa3494a","status":"affected","lessThan":"ceafb893b12f23331dcc5ff9587e643c3a40ee9f","versionType":"git"},{"version":"6fa01ccd883021105e9f8af7d04b9f156fa3494a","status":"affected","lessThan":"2e0e74c59b2761a414d9f48d7bee1e45220b2427","versionType":"git"},{"version":"6fa01ccd883021105e9f8af7d04b9f156fa3494a","status":"affected","lessThan":"96a4713ae041cc85e712bac682cd2e644004d6c6","versionType":"git"},{"version":"6fa01ccd883021105e9f8af7d04b9f156fa3494a","status":"affected","lessThan":"474d6c771d798bca84f0a140b611e36743511e18","versionType":"git"},{"version":"6fa01ccd883021105e9f8af7d04b9f156fa3494a","status":"affected","lessThan":"98d0912e9f841e5529a5b89a972805f34cb1c69d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/skbuff.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.7","versionType":"semver"},{"version":"5.10.259","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.210","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.93","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.35","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.12","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/skbuff.c"]}],"references":["https://git.kernel.org/stable/c/8dbed691e43a50903658130bde0fcb5abc425b37","https://git.kernel.org/stable/c/9b40bdc2a3298225dffab8158208a0d8c6300578","https://git.kernel.org/stable/c/fd470f0a97b8e9a125f520265d2f3b088ffb5b8a","https://git.kernel.org/stable/c/ceafb893b12f23331dcc5ff9587e643c3a40ee9f","https://git.kernel.org/stable/c/2e0e74c59b2761a414d9f48d7bee1e45220b2427","https://git.kernel.org/stable/c/96a4713ae041cc85e712bac682cd2e644004d6c6","https://git.kernel.org/stable/c/474d6c771d798bca84f0a140b611e36743511e18","https://git.kernel.org/stable/c/98d0912e9f841e5529a5b89a972805f34cb1c69d","https://access.redhat.com/security/cve/CVE-2026-52943","https://bugzilla.redhat.com/show_bug.cgi?id=2492137","https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52943.json","https://cert-portal.siemens.com/productcert/html/ssa-019113.html","https://cert-portal.siemens.com/productcert/html/ssa-457936.html","https://cert-portal.siemens.com/productcert/html/ssa-784472.html"],"weaknesses":["CWE-911","CWE-416"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/52xxx/CVE-2026-52943.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-52943","state":"PUBLISHED","datePublished":"2026-06-24T09:00:12.292Z","dateUpdated":"2026-10-19T19:47:08.739Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.371Z"},"containers":{"cna":{"title":"net: skbuff: fix missing zerocopy reference in pskb_carve helpers","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: fix missing zerocopy reference in pskb_carve helpers\n\npskb_carve_inside_header() and pskb_carve_inside_nonlinear() both copy\nthe old skb_shared_info header into a new buffer via memcpy(), which\nincludes the destructor_arg pointer (uarg) for MSG_ZEROCOPY skbs.\nNeither function calls net_zcopy_get() for the new shinfo, creating an\nunaccounted holder: every skb_shared_info with destructor_arg set will\ncall skb_zcopy_clear() once when freed, but the corresponding\nnet_zcopy_get() was never called for the new copy. Repeated calls\ndrive uarg->refcnt 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->destructor_arg copied by pskb_carve_inside_nonlinear() without\na refcount bump. This has been verified to be reliably exploitable: a\nworking proof-of-concept achieves full root privilege escalation from\nan unprivileged local user on a default kernel configuration.\n\nThe fix follows the pattern of pskb_expand_head() which has the same\nmemcpy/cloned structure. For pskb_carve_inside_header(), net_zcopy_get()\nis placed after skb_orphan_frags() succeeds, so the orphan error path\nneeds no cleanup. 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()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6fa01ccd883021105e9f8af7d04b9f156fa3494a","status":"affected","lessThan":"8dbed691e43a50903658130bde0fcb5abc425b37","versionType":"git"},{"version":"6fa01ccd883021105e9f8af7d04b9f156fa3494a","status":"affected","lessThan":"9b40bdc2a3298225dffab8158208a0d8c6300578","versionType":"git"},{"version":"6fa01ccd883021105e9f8af7d04b9f156fa3494a","status":"affected","lessThan":"fd470f0a97b8e9a125f520265d2f3b088ffb5b8a","versionType":"git"},{"version":"6fa01ccd883021105e9f8af7d04b9f156fa3494a","status":"affected","lessThan":"ceafb893b12f23331dcc5ff9587e643c3a40ee9f","versionType":"git"},{"version":"6fa01ccd883021105e9f8af7d04b9f156fa3494a","status":"affected","lessThan":"2e0e74c59b2761a414d9f48d7bee1e45220b2427","versionType":"git"},{"version":"6fa01ccd883021105e9f8af7d04b9f156fa3494a","status":"affected","lessThan":"96a4713ae041cc85e712bac682cd2e644004d6c6","versionType":"git"},{"version":"6fa01ccd883021105e9f8af7d04b9f156fa3494a","status":"affected","lessThan":"474d6c771d798bca84f0a140b611e36743511e18","versionType":"git"},{"version":"6fa01ccd883021105e9f8af7d04b9f156fa3494a","status":"affected","lessThan":"98d0912e9f841e5529a5b89a972805f34cb1c69d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/skbuff.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.7","versionType":"semver"},{"version":"5.10.259","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.210","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.143","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.93","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.35","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.12","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/core/skbuff.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/8dbed691e43a50903658130bde0fcb5abc425b37"},{"url":"https://git.kernel.org/stable/c/9b40bdc2a3298225dffab8158208a0d8c6300578"},{"url":"https://git.kernel.org/stable/c/fd470f0a97b8e9a125f520265d2f3b088ffb5b8a"},{"url":"https://git.kernel.org/stable/c/ceafb893b12f23331dcc5ff9587e643c3a40ee9f"},{"url":"https://git.kernel.org/stable/c/2e0e74c59b2761a414d9f48d7bee1e45220b2427"},{"url":"https://git.kernel.org/stable/c/96a4713ae041cc85e712bac682cd2e644004d6c6"},{"url":"https://git.kernel.org/stable/c/474d6c771d798bca84f0a140b611e36743511e18"},{"url":"https://git.kernel.org/stable/c/98d0912e9f841e5529a5b89a972805f34cb1c69d"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","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. 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The `pskb_carve_inside_header()` and `pskb_carve_inside_nonlinear()` helper functions, which handle network packet buffers, do not correctly account for zero-copy references. This oversight can lead to a use-after-free vulnerability, where memory is prematurely released while still in use. A local unprivileged user can exploit this flaw to achieve full root privilege escalation on the system."}],"affected":[{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","packageName":"kernel","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:10"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 6","packageName":"kernel","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:6"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 7","packageName":"kernel","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:7"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 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