{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23368","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-01-13T15:37:46.003Z","datePublished":"2026-03-25T10:27:49.889Z","dateUpdated":"2026-05-11T22:05:31.385Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:05:31.385Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: phy: register phy led_triggers during probe to avoid AB-BA deadlock\n\nThere is an AB-BA deadlock when both LEDS_TRIGGER_NETDEV and\nLED_TRIGGER_PHY are enabled:\n\n[ 1362.049207] [<8054e4b8>] led_trigger_register+0x5c/0x1fc             <-- Trying to get lock \"triggers_list_lock\" via down_write(&triggers_list_lock);\n[ 1362.054536] [<80662830>] phy_led_triggers_register+0xd0/0x234\n[ 1362.060329] [<8065e200>] phy_attach_direct+0x33c/0x40c\n[ 1362.065489] [<80651fc4>] phylink_fwnode_phy_connect+0x15c/0x23c\n[ 1362.071480] [<8066ee18>] mtk_open+0x7c/0xba0\n[ 1362.075849] [<806d714c>] __dev_open+0x280/0x2b0\n[ 1362.080384] [<806d7668>] __dev_change_flags+0x244/0x24c\n[ 1362.085598] [<806d7698>] dev_change_flags+0x28/0x78\n[ 1362.090528] [<807150e4>] dev_ioctl+0x4c0/0x654                       <-- Hold lock \"rtnl_mutex\" by calling rtnl_lock();\n[ 1362.094985] [<80694360>] sock_ioctl+0x2f4/0x4e0\n[ 1362.099567] [<802e9c4c>] sys_ioctl+0x32c/0xd8c\n[ 1362.104022] [<80014504>] syscall_common+0x34/0x58\n\nHere LED_TRIGGER_PHY is registering LED triggers during phy_attach\nwhile holding RTNL and then taking triggers_list_lock.\n\n[ 1362.191101] [<806c2640>] register_netdevice_notifier+0x60/0x168      <-- Trying to get lock \"rtnl_mutex\" via rtnl_lock();\n[ 1362.197073] [<805504ac>] netdev_trig_activate+0x194/0x1e4\n[ 1362.202490] [<8054e28c>] led_trigger_set+0x1d4/0x360                 <-- Hold lock \"triggers_list_lock\" by down_read(&triggers_list_lock);\n[ 1362.207511] [<8054eb38>] led_trigger_write+0xd8/0x14c\n[ 1362.212566] [<80381d98>] sysfs_kf_bin_write+0x80/0xbc\n[ 1362.217688] [<8037fcd8>] kernfs_fop_write_iter+0x17c/0x28c\n[ 1362.223174] [<802cbd70>] vfs_write+0x21c/0x3c4\n[ 1362.227712] [<802cc0c4>] ksys_write+0x78/0x12c\n[ 1362.232164] [<80014504>] syscall_common+0x34/0x58\n\nHere LEDS_TRIGGER_NETDEV is being enabled on an LED. It first takes\ntriggers_list_lock and then RTNL. A classical AB-BA deadlock.\n\nphy_led_triggers_registers() does not require the RTNL, it does not\nmake any calls into the network stack which require protection. There\nis also no requirement the PHY has been attached to a MAC, the\ntriggers only make use of phydev state. This allows the call to\nphy_led_triggers_registers() to be placed elsewhere. PHY probe() and\nrelease() don't hold RTNL, so solving the AB-BA deadlock."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/phy/phy_device.c"],"versions":[{"version":"06f502f57d0d7728f9fa0f157ec5e4111ddb98f6","lessThan":"2b01518eabace18f7ec8b4cafd52082303080dca","status":"affected","versionType":"git"},{"version":"06f502f57d0d7728f9fa0f157ec5e4111ddb98f6","lessThan":"305afdd02ff3e694c165457793104710ec0728e5","status":"affected","versionType":"git"},{"version":"06f502f57d0d7728f9fa0f157ec5e4111ddb98f6","lessThan":"c6ffc2d2338d325e1edd0c702e3ee623aa5fdc6a","status":"affected","versionType":"git"},{"version":"06f502f57d0d7728f9fa0f157ec5e4111ddb98f6","lessThan":"c33523b8fd2d4c504ada18cd93f511f2a8f84217","status":"affected","versionType":"git"},{"version":"06f502f57d0d7728f9fa0f157ec5e4111ddb98f6","lessThan":"241cd64cf2e32b28ead151b1795cd8fef2b6e482","status":"affected","versionType":"git"},{"version":"06f502f57d0d7728f9fa0f157ec5e4111ddb98f6","lessThan":"2764dcb3c35de4410f642afc62cf979727470575","status":"affected","versionType":"git"},{"version":"06f502f57d0d7728f9fa0f157ec5e4111ddb98f6","lessThan":"cde2d0b5ab5d03b5b6f17d4f654d8b30ccf36757","status":"affected","versionType":"git"},{"version":"06f502f57d0d7728f9fa0f157ec5e4111ddb98f6","lessThan":"c8dbdc6e380e7e96a51706db3e4b7870d8a9402d","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/net/phy/phy_device.c"],"versions":[{"version":"4.16","status":"affected"},{"version":"0","lessThan":"4.16","status":"unaffected","versionType":"semver"},{"version":"5.10.253","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.203","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.167","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.130","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.78","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.17","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.7","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","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":"4.16","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.1.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.12.78"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.18.17"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"6.19.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.16","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/2b01518eabace18f7ec8b4cafd52082303080dca"},{"url":"https://git.kernel.org/stable/c/305afdd02ff3e694c165457793104710ec0728e5"},{"url":"https://git.kernel.org/stable/c/c6ffc2d2338d325e1edd0c702e3ee623aa5fdc6a"},{"url":"https://git.kernel.org/stable/c/c33523b8fd2d4c504ada18cd93f511f2a8f84217"},{"url":"https://git.kernel.org/stable/c/241cd64cf2e32b28ead151b1795cd8fef2b6e482"},{"url":"https://git.kernel.org/stable/c/2764dcb3c35de4410f642afc62cf979727470575"},{"url":"https://git.kernel.org/stable/c/cde2d0b5ab5d03b5b6f17d4f654d8b30ccf36757"},{"url":"https://git.kernel.org/stable/c/c8dbdc6e380e7e96a51706db3e4b7870d8a9402d"}],"title":"net: phy: register phy led_triggers during probe to avoid AB-BA deadlock","x_generator":{"engine":"bippy-1.2.0"}}}}