{ "cveId": "CVE-2026-43050", "url": "https://patchblox.com/security/cve/CVE-2026-43050", "summary": "CVE-2026-43050 is fixed in 47 products on 1 platform, first by DEBIAN-CVE-2026-43050, released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.", "title": "linux: In the Linux kernel, the following vulnerability has been resolved: atm: lec: fix use-after-free in sock_def_readabl...", "description": "In the Linux kernel, the following vulnerability has been resolved: atm: lec: fix use-after-free in sock_def_readable() A race condition exists between lec_atm_close() setting priv-\u003Elecd to NULL and concurrent access to priv-\u003Elecd in send_to_lecd(), lec_handle_bridge(), and lec_atm_send(). When the socket is freed via RCU while another thread is still using it, a use-after-free occurs in sock_def_readable() when accessing the socket\u0027s wait queue. The root cause is that lec_atm_close() clears priv-\u003Elecd without any synchronization, while callers dereference priv-\u003Elecd without any protection against concurrent teardown. Fix this by converting priv-\u003Elecd to an RCU-protected pointer: - Mark priv-\u003Elecd as __rcu in lec.h - Use rcu_assign_pointer() in lec_atm_close() and lecd_attach() for safe pointer assignment - Use rcu_access_pointer() for NULL checks that do not dereference the pointer in lec_start_xmit(), lec_push(), send_to_lecd() and lecd_attach() - Use rcu_read_lock/rcu_dereference/rcu_read_unlock in send_to_lecd(), lec_handle_bridge() and lec_atm_send() to safely access lecd - Use rcu_assign_pointer() followed by synchronize_rcu() in lec_atm_close() to ensure all readers have completed before proceeding. This is safe since lec_atm_close() is called from vcc_release() which holds lock_sock(), a sleeping lock. - Remove the manual sk_receive_queue drain from lec_atm_close() since vcc_destroy_socket() already drains it after lec_atm_close() returns. v2: Switch from spinlock \u002B sock_hold/put approach to RCU to properly fix the race. The v1 spinlock approach had two issues pointed out by Eric Dumazet: 1. priv-\u003Elecd was still accessed directly after releasing the lock instead of using a local copy. 2. The spinlock did not prevent packets being queued after lec_atm_close() drains sk_receive_queue since timer and workqueue paths bypass netif_stop_queue(). Note: Syzbot patch testing was attempted but the test VM terminated unexpectedly with \u0022Connection to localhost closed by remote host\u0022, likely due to a QEMU AHCI emulation issue unrelated to this fix. Compile testing with \u0022make W=1 net/atm/lec.o\u0022 passes cleanly.", "published": "2026-05-01T15:16:51Z", "severity": "high", "cvss": 7, "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "epss": 0.00119, "epssPercentile": 0.01754, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "fixes": [ { "platform": "linux", "product": "kernel-64kb", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.55.1", "fix": "SUSE-SU-2026:2238-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2238-1", "released": "2026-06-30T10:03:11Z" }, { "platform": "linux", "product": "kernel-azure", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.55.1", "fix": "SUSE-SU-2026:2238-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2238-1", "released": "2026-06-30T10:03:11Z" }, { "platform": "linux", "product": "kernel-default", "release": "sles 15.6", "fixedVersion": "6.4.0-150600.23.112.1", "fix": "SUSE-SU-2026:2195-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2195-1", "released": "2026-07-01T08:17:32Z" }, { "platform": "linux", "product": "kernel-default", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.55.1", "fix": "SUSE-SU-2026:2238-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2238-1", "released": "2026-06-30T10:03:11Z" }, { "platform": "linux", "product": "kernel-default-base", "release": "sles 15.6", "fixedVersion": "6.4.0-150600.23.112.1.150600.12.52.1", "fix": "SUSE-SU-2026:2195-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2195-1", "released": "2026-07-01T08:17:32Z" }, { "platform": "linux", "product": "kernel-default-base", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.55.1.150700.17.33.1", "fix": "SUSE-SU-2026:2238-1", "url": "https://patchblox.com/security/fix/linux/suse-su-2026-2238-1", "released": "2026-06-30T10:03:11Z" }, { "platform": "linux", "product": "kernel-docs", "release": 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