{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23115","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-01-13T15:37:45.969Z","datePublished":"2026-02-14T15:09:47.826Z","dateUpdated":"2026-05-11T22:00:24.910Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:00:24.910Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nserial: Fix not set tty->port race condition\n\nRevert commit bfc467db60b7 (\"serial: remove redundant\ntty_port_link_device()\") because the tty_port_link_device() is not\nredundant: the tty->port has to be confured before we call\nuart_configure_port(), otherwise user-space can open console without TTY\nlinked to the driver.\n\nThis tty_port_link_device() was added explicitly to avoid this exact\nissue in commit fb2b90014d78 (\"tty: link tty and port before configuring\nit as console\"), so offending commit basically reverted the fix saying\nit is redundant without addressing the actual race condition presented\nthere.\n\nReproducible always as tty->port warning on Qualcomm SoC with most of\ndevices disabled, so with very fast boot, and one serial device being\nthe console:\n\n  printk: legacy console [ttyMSM0] enabled\n  printk: legacy console [ttyMSM0] enabled\n  printk: legacy bootconsole [qcom_geni0] disabled\n  printk: legacy bootconsole [qcom_geni0] disabled\n  ------------[ cut here ]------------\n  tty_init_dev: ttyMSM driver does not set tty->port. This would crash the kernel. Fix the driver!\n  WARNING: drivers/tty/tty_io.c:1414 at tty_init_dev.part.0+0x228/0x25c, CPU#2: systemd/1\n  Modules linked in: socinfo tcsrcc_eliza gcc_eliza sm3_ce fuse ipv6\n  CPU: 2 UID: 0 PID: 1 Comm: systemd Tainted: G S                  6.19.0-rc4-next-20260108-00024-g2202f4d30aa8 #73 PREEMPT\n  Tainted: [S]=CPU_OUT_OF_SPEC\n  Hardware name: Qualcomm Technologies, Inc. Eliza (DT)\n  ...\n  tty_init_dev.part.0 (drivers/tty/tty_io.c:1414 (discriminator 11)) (P)\n  tty_open (arch/arm64/include/asm/atomic_ll_sc.h:95 (discriminator 3) drivers/tty/tty_io.c:2073 (discriminator 3) drivers/tty/tty_io.c:2120 (discriminator 3))\n  chrdev_open (fs/char_dev.c:411)\n  do_dentry_open (fs/open.c:962)\n  vfs_open (fs/open.c:1094)\n  do_open (fs/namei.c:4634)\n  path_openat (fs/namei.c:4793)\n  do_filp_open (fs/namei.c:4820)\n  do_sys_openat2 (fs/open.c:1391 (discriminator 3))\n  ...\n  Starting Network Name Resolution...\n\nApparently the flow with this small Yocto-based ramdisk user-space is:\n\ndriver (qcom_geni_serial.c):                  user-space:\n============================                  ===========\nqcom_geni_serial_probe()\n uart_add_one_port()\n  serial_core_register_port()\n   serial_core_add_one_port()\n    uart_configure_port()\n     register_console()\n    |\n    |                                         open console\n    |                                          ...\n    |                                          tty_init_dev()\n    |                                           driver->ports[idx] is NULL\n    |\n    tty_port_register_device_attr_serdev()\n     tty_port_link_device() <- set driver->ports[idx]"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/serial/serial_core.c"],"versions":[{"version":"bfc467db60b76c30ca1f7f02088a219b6d5b6e8c","lessThan":"2501c49306238b54a2de0f93de43d50ab6e76c84","status":"affected","versionType":"git"},{"version":"bfc467db60b76c30ca1f7f02088a219b6d5b6e8c","lessThan":"32f37e57583f869140cff445feedeea8a5fea986","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/serial/serial_core.c"],"versions":[{"version":"6.15","status":"affected"},{"version":"0","lessThan":"6.15","status":"unaffected","versionType":"semver"},{"version":"6.18.8","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19","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":"6.15","versionEndExcluding":"6.18.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.19"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/2501c49306238b54a2de0f93de43d50ab6e76c84"},{"url":"https://git.kernel.org/stable/c/32f37e57583f869140cff445feedeea8a5fea986"}],"title":"serial: Fix not set tty->port race condition","x_generator":{"engine":"bippy-1.2.0"}}}}