{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53033", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.380Z", "datePublished": "2026-06-24T16:29:40.794Z", "dateUpdated": "2026-08-05T12:32:46.155Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:32:46.155Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Take state lock for af_unix iter\n\nWhen a BPF iterator program updates a sockmap, there is a race condition in\nunix_stream_bpf_update_proto() where the `peer` pointer can become stale[1]\nduring a state transition TCP_ESTABLISHED -> TCP_CLOSE.\n\n CPU0 bpf CPU1 close\n -------- ----------\n// unix_stream_bpf_update_proto()\nsk_pair = unix_peer(sk)\nif (unlikely(!sk_pair))\n return -EINVAL;\n // unix_release_sock()\n skpair = unix_peer(sk);\n unix_peer(sk) = NULL;\n sock_put(skpair)\nsock_hold(sk_pair) // UaF\n\nMore practically, this fix guarantees that the iterator program is\nconsistently provided with a unix socket that remains stable during\niterator execution.\n\n[1]:\nBUG: KASAN: slab-use-after-free in unix_stream_bpf_update_proto+0x155/0x490\nWrite of size 4 at addr ffff8881178c9a00 by task test_progs/2231\nCall Trace:\n dump_stack_lvl+0x5d/0x80\n print_report+0x170/0x4f3\n kasan_report+0xe4/0x1c0\n kasan_check_range+0x125/0x200\n unix_stream_bpf_update_proto+0x155/0x490\n sock_map_link+0x71c/0xec0\n sock_map_update_common+0xbc/0x600\n sock_map_update_elem+0x19a/0x1f0\n bpf_prog_bbbf56096cdd4f01_selective_dump_unix+0x20c/0x217\n bpf_iter_run_prog+0x21e/0xae0\n bpf_iter_unix_seq_show+0x1e0/0x2a0\n bpf_seq_read+0x42c/0x10d0\n vfs_read+0x171/0xb20\n ksys_read+0xff/0x200\n do_syscall_64+0xf7/0x5e0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nAllocated by task 2236:\n kasan_save_stack+0x30/0x50\n kasan_save_track+0x14/0x30\n __kasan_slab_alloc+0x63/0x80\n kmem_cache_alloc_noprof+0x1d5/0x680\n sk_prot_alloc+0x59/0x210\n sk_alloc+0x34/0x470\n unix_create1+0x86/0x8a0\n unix_stream_connect+0x318/0x15b0\n __sys_connect+0xfd/0x130\n __x64_sys_connect+0x72/0xd0\n do_syscall_64+0xf7/0x5e0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nFreed by task 2236:\n kasan_save_stack+0x30/0x50\n kasan_save_track+0x14/0x30\n kasan_save_free_info+0x3b/0x70\n __kasan_slab_free+0x47/0x70\n kmem_cache_free+0x11c/0x590\n __sk_destruct+0x432/0x6e0\n unix_release_sock+0x9b3/0xf60\n unix_release+0x8a/0xf0\n __sock_release+0xb0/0x270\n sock_close+0x18/0x20\n __fput+0x36e/0xac0\n fput_close_sync+0xe5/0x1a0\n __x64_sys_close+0x7d/0xd0\n do_syscall_64+0xf7/0x5e0\n entry_SYSCALL_64_after_hwframe+0x76/0x7e" } ], "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 - Exploitation is through local syscalls: loading/attaching a BPF Unix-socket iterator, creating/updating a sockmap, reading the iterator fd, and racing an AF_UNIX socket close. No remote network packet path reaches this iterator execution.\nAC:L - The attacker can create the AF_UNIX sockets, run the iterator read, and close the peer concurrently, controlling both sides of the race. No external victim timing or uncommon state is required beyond winning an attacker-orchestrated race.\nPR:L - The non-delegated path requires BPF-related capabilities, but BPF tokens can delegate the needed CAP_BPF/CAP_PERFMON/CAP_NET_ADMIN checks into a non-init user namespace. Under the higher-severity rule, this is best treated as reachable with low delegated local privileges rather than requiring init-namespace root.\nUI:N - No victim action is needed after the attacker has local execution and the required BPF access. The attacker triggers the iterator read and socket close directly.\nS:U - The bug corrupts kernel memory within the same OS security authority. It is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The bug is a slab use-after-free on an AF_UNIX peer socket object during `sock_hold()`. Per kernel UAF guidance, this memory corruption can be leveraged for kernel memory disclosure in a plausible exploit.\nI:H - The stale peer pointer leads to a write to freed memory via the socket refcount increment. As a kernel UAF/write primitive, it is reasonably treated as enabling arbitrary corruption or control-flow compromise.\nA:H - The reported failure is a KASAN slab-use-after-free in kernel context and can crash or oops the kernel. Repeated local triggering can cause high availability impact." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/unix/af_unix.c" ], "versions": [ { "version": "2c860a43dd77f969bb959336a2f743d7103a8f63", "lessThan": "c6f4015eac2e3cbc3cb7a17539e10bbb5c2049c3", "status": "affected", "versionType": "git" }, { "version": "2c860a43dd77f969bb959336a2f743d7103a8f63", "lessThan": "d0d124dbcef9318e326956137b31671407094bd4", "status": "affected", "versionType": "git" }, { "version": "2c860a43dd77f969bb959336a2f743d7103a8f63", "lessThan": "1a59cc6b65fd3ad9915aae5970d859109d4ce9fb", "status": "affected", "versionType": "git" }, { "version": "2c860a43dd77f969bb959336a2f743d7103a8f63", "lessThan": "921920c34cb591947dd30c692500795a69f1e3fa", "status": "affected", "versionType": "git" }, { "version": "2c860a43dd77f969bb959336a2f743d7103a8f63", "lessThan": "98f744d204e5d6fca589cd2c44c3190a0c71697f", "status": "affected", "versionType": "git" }, { "version": "2c860a43dd77f969bb959336a2f743d7103a8f63", "lessThan": "64c2f93fc3254d3bf5de4445fb732ee5c451edb6", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/unix/af_unix.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.141" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.91" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.18.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.0.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/c6f4015eac2e3cbc3cb7a17539e10bbb5c2049c3" }, { "url": "https://git.kernel.org/stable/c/d0d124dbcef9318e326956137b31671407094bd4" }, { "url": "https://git.kernel.org/stable/c/1a59cc6b65fd3ad9915aae5970d859109d4ce9fb" }, { "url": "https://git.kernel.org/stable/c/921920c34cb591947dd30c692500795a69f1e3fa" }, { "url": "https://git.kernel.org/stable/c/98f744d204e5d6fca589cd2c44c3190a0c71697f" }, { "url": "https://git.kernel.org/stable/c/64c2f93fc3254d3bf5de4445fb732ee5c451edb6" } ], "title": "bpf, sockmap: Take state lock for af_unix iter", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "affected": [ { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:10" ], "defaultStatus": "affected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 10", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:6" ], "defaultStatus": "unaffected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 6", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:7" ], "defaultStatus": "unaffected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 7", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:7" ], "defaultStatus": "unaffected", "packageName": "kernel-rt", "product": "Red Hat Enterprise Linux 7", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:8" ], "defaultStatus": "unaffected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 8", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:8" ], "defaultStatus": "unaffected", "packageName": "kernel-rt", "product": "Red Hat Enterprise Linux 8", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:9" ], "defaultStatus": "affected", "packageName": "kernel", "product": "Red Hat Enterprise Linux 9", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/o:redhat:enterprise_linux:9" ], "defaultStatus": "affected", "packageName": "kernel-rt", "product": "Red Hat Enterprise Linux 9", "vendor": "Red Hat" } ], "datePublic": "2026-06-24T00:00:00.000Z", "descriptions": [ { "lang": "en", "value": "A flaw was found in the Linux kernel's sockmap functionality. A race condition exists in the unix_stream_bpf_update_proto() function when a BPF (Berkeley Packet Filter) iterator program updates a sockmap. This can lead to a use-after-free (UaF) vulnerability, where memory is accessed after it has been freed. An attacker could potentially exploit this to cause a denial of service or achieve arbitrary code execution." } ], "metrics": [ { "other": { "content": { "namespace": "https://access.redhat.com/security/updates/classification/", "value": "Moderate" }, "type": "Red Hat severity rating" } }, { "cvssV3_1": { "attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "format": "CVSS" } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-825", "description": "Expired Pointer Dereference", "lang": "en", "type": "CWE" } ] } ], "references": [ { "tags": [ "vdb-entry", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/security/cve/CVE-2026-53033" }, { "name": "RHBZ#2492281", "tags": [ "issue-tracking", "x_refsource_REDHAT" ], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492281" }, { "tags": [ "x_sadp-csaf-vex" ], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53033.json" } ], "timeline": [ { "lang": "en", "time": "2026-06-24T00:00:00.000Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-06-24T00:00:00.000Z", "value": "Made public." } ], "title": "kernel: bpf, sockmap: Take state lock for af_unix iter", "x_adpType": "supplier", "x_generator": { "engine": "sadp-cli 1.0.0" }, "providerMetadata": { "orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-07-15T00:45:13.077Z" } } ] } }