{"id":"CVE-2025-38023","title":"nfs: handle failure of nfs_get_lock_context in unlock path","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfs: handle failure of nfs_get_lock_context in unlock path\n\nWhen memory is insufficient, the allocation of nfs_lock_context in\nnfs_get_lock_context() fails and returns …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= f30cb757f680f965ba8a2e53cb3588052a01aeb5 < db6f5ee1fc8f54d079d0751292c2fc2d78e3aad1","Linux >= f30cb757f680f965ba8a2e53cb3588052a01aeb5 < 4c189fd40a09a03f9a900bedb2d9064f1734d72a","Linux >= f30cb757f680f965ba8a2e53cb3588052a01aeb5 < 72f552e00c50f265896d3c19edc6696aa2910081","Linux >= f30cb757f680f965ba8a2e53cb3588052a01aeb5 < 85fb7f8ca5f8c138579fdfc9b97b3083e6077d40","Linux >= f30cb757f680f965ba8a2e53cb3588052a01aeb5 < a6879a076b98c99c9fe747816fe1c29543442441","Linux >= f30cb757f680f965ba8a2e53cb3588052a01aeb5 < da824f1271633bcb515ca8084cda3eda4b3ace51","Linux >= f30cb757f680f965ba8a2e53cb3588052a01aeb5 < f601960af04d2ecb007c928ba153d34051acd9c1","Linux >= f30cb757f680f965ba8a2e53cb3588052a01aeb5 < c457dc1ec770a22636b473ce5d35614adfe97636","Linux 4.12"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T20:48:18.289745Z"},"published":"2025-06-18","updated":"2026-11-05","sourceUpdated":"2026-11-05T20:52:12.741Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-38023","references":[{"url":"https://git.kernel.org/stable/c/db6f5ee1fc8f54d079d0751292c2fc2d78e3aad1"},{"url":"https://git.kernel.org/stable/c/4c189fd40a09a03f9a900bedb2d9064f1734d72a"},{"url":"https://git.kernel.org/stable/c/72f552e00c50f265896d3c19edc6696aa2910081"},{"url":"https://git.kernel.org/stable/c/85fb7f8ca5f8c138579fdfc9b97b3083e6077d40"},{"url":"https://git.kernel.org/stable/c/a6879a076b98c99c9fe747816fe1c29543442441"},{"url":"https://git.kernel.org/stable/c/da824f1271633bcb515ca8084cda3eda4b3ace51"},{"url":"https://git.kernel.org/stable/c/f601960af04d2ecb007c928ba153d34051acd9c1"},{"url":"https://git.kernel.org/stable/c/c457dc1ec770a22636b473ce5d35614adfe97636"}],"tags":["cve.org"],"epss":0.00228,"epssPercentile":0.13602,"ingestedAt":"2026-11-05T22:38:31.908Z","slug":"CVE-2025-38023","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnfs: handle failure of nfs_get_lock_context in unlock path\n\nWhen memory is insufficient, the allocation of nfs_lock_context in\nnfs_get_lock_context() fails and returns -ENOMEM. If we mistakenly treat\nan nfs4_unlockdata structure (whose l_ctx member has been set to -ENOMEM)\nas valid and proceed to execute rpc_run_task(), this will trigger a NULL\npointer dereference in nfs4_locku_prepare. For example:\n\nBUG: kernel NULL pointer dereference, address: 000000000000000c\nPGD 0 P4D 0\nOops: Oops: 0000 [#1] SMP PTI\nCPU: 15 UID: 0 PID: 12 Comm: kworker/u64:0 Not tainted 6.15.0-rc2-dirty #60\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-2.fc40\nWorkqueue: rpciod rpc_async_schedule\nRIP: 0010:nfs4_locku_prepare+0x35/0xc2\nCode: 89 f2 48 89 fd 48 c7 c7 68 69 ef b5 53 48 8b 8e 90 00 00 00 48 89 f3\nRSP: 0018:ffffbbafc006bdb8 EFLAGS: 00010246\nRAX: 000000000000004b RBX: ffff9b964fc1fa00 RCX: 0000000000000000\nRDX: 0000000000000000 RSI: fffffffffffffff4 RDI: ffff9ba53fddbf40\nRBP: ffff9ba539934000 R08: 0000000000000000 R09: ffffbbafc006bc38\nR10: ffffffffb6b689c8 R11: 0000000000000003 R12: ffff9ba539934030\nR13: 0000000000000001 R14: 0000000004248060 R15: ffffffffb56d1c30\nFS: 0000000000000000(0000) GS:ffff9ba5881f0000(0000) knlGS:00000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 000000000000000c CR3: 000000093f244000 CR4: 00000000000006f0\nCall Trace:\n <TASK>\n __rpc_execute+0xbc/0x480\n rpc_async_schedule+0x2f/0x40\n process_one_work+0x232/0x5d0\n worker_thread+0x1da/0x3d0\n ? __pfx_worker_thread+0x10/0x10\n kthread+0x10d/0x240\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x34/0x50\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1a/0x30\n </TASK>\nModules linked in:\nCR2: 000000000000000c\n---[ end trace 0000000000000000 ]---\n\nFree the allocated nfs4_unlockdata when nfs_get_lock_context() fails and\nreturn NULL to terminate subsequent rpc_run_task, preventing NULL pointer\ndereference.\n\n## Affected\n\n- `Linux >= f30cb757f680f965ba8a2e53cb3588052a01aeb5 < db6f5ee1fc8f54d079d0751292c2fc2d78e3aad1`\n- `Linux >= f30cb757f680f965ba8a2e53cb3588052a01aeb5 < 4c189fd40a09a03f9a900bedb2d9064f1734d72a`\n- `Linux >= f30cb757f680f965ba8a2e53cb3588052a01aeb5 < 72f552e00c50f265896d3c19edc6696aa2910081`\n- `Linux >= f30cb757f680f965ba8a2e53cb3588052a01aeb5 < 85fb7f8ca5f8c138579fdfc9b97b3083e6077d40`\n- `Linux >= f30cb757f680f965ba8a2e53cb3588052a01aeb5 < a6879a076b98c99c9fe747816fe1c29543442441`\n- `Linux >= f30cb757f680f965ba8a2e53cb3588052a01aeb5 < da824f1271633bcb515ca8084cda3eda4b3ace51`\n- `Linux >= f30cb757f680f965ba8a2e53cb3588052a01aeb5 < f601960af04d2ecb007c928ba153d34051acd9c1`\n- `Linux >= f30cb757f680f965ba8a2e53cb3588052a01aeb5 < c457dc1ec770a22636b473ce5d35614adfe97636`\n- `Linux 4.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}