{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-04-14T22:22:27.059","vulnerabilities":[{"cve":{"id":"CVE-2025-21796","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2025-02-27T03:15:20.497","lastModified":"2025-11-03T21:19:11.067","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: clear acl_access\/acl_default after releasing them\n\nIf getting acl_default fails, acl_access and acl_default will be released\nsimultaneously. However, acl_access will still retain a pointer pointing\nto the released posix_acl, which will trigger a WARNING in\nnfs3svc_release_getacl like this:\n\n------------[ cut here ]------------\nrefcount_t: underflow; use-after-free.\nWARNING: CPU: 26 PID: 3199 at lib\/refcount.c:28\nrefcount_warn_saturate+0xb5\/0x170\nModules linked in:\nCPU: 26 UID: 0 PID: 3199 Comm: nfsd Not tainted\n6.12.0-rc6-00079-g04ae226af01f-dirty #8\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n1.16.1-2.fc37 04\/01\/2014\nRIP: 0010:refcount_warn_saturate+0xb5\/0x170\nCode: cc cc 0f b6 1d b3 20 a5 03 80 fb 01 0f 87 65 48 d8 00 83 e3 01 75\ne4 48 c7 c7 c0 3b 9b 85 c6 05 97 20 a5 03 01 e8 fb 3e 30 ff <0f> 0b eb\ncd 0f b6 1d 8a3\nRSP: 0018:ffffc90008637cd8 EFLAGS: 00010282\nRAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff83904fde\nRDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88871ed36380\nRBP: ffff888158beeb40 R08: 0000000000000001 R09: fffff520010c6f56\nR10: ffffc90008637ab7 R11: 0000000000000001 R12: 0000000000000001\nR13: ffff888140e77400 R14: ffff888140e77408 R15: ffffffff858b42c0\nFS:  0000000000000000(0000) GS:ffff88871ed00000(0000)\nknlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000562384d32158 CR3: 000000055cc6a000 CR4: 00000000000006f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n <TASK>\n ? refcount_warn_saturate+0xb5\/0x170\n ? __warn+0xa5\/0x140\n ? refcount_warn_saturate+0xb5\/0x170\n ? report_bug+0x1b1\/0x1e0\n ? handle_bug+0x53\/0xa0\n ? exc_invalid_op+0x17\/0x40\n ? asm_exc_invalid_op+0x1a\/0x20\n ? tick_nohz_tick_stopped+0x1e\/0x40\n ? refcount_warn_saturate+0xb5\/0x170\n ? refcount_warn_saturate+0xb5\/0x170\n nfs3svc_release_getacl+0xc9\/0xe0\n svc_process_common+0x5db\/0xb60\n ? __pfx_svc_process_common+0x10\/0x10\n ? __rcu_read_unlock+0x69\/0xa0\n ? __pfx_nfsd_dispatch+0x10\/0x10\n ? svc_xprt_received+0xa1\/0x120\n ? xdr_init_decode+0x11d\/0x190\n svc_process+0x2a7\/0x330\n svc_handle_xprt+0x69d\/0x940\n svc_recv+0x180\/0x2d0\n nfsd+0x168\/0x200\n ? __pfx_nfsd+0x10\/0x10\n kthread+0x1a2\/0x1e0\n ? kthread+0xf4\/0x1e0\n ? __pfx_kthread+0x10\/0x10\n ret_from_fork+0x34\/0x60\n ? __pfx_kthread+0x10\/0x10\n ret_from_fork_asm+0x1a\/0x30\n <\/TASK>\nKernel panic - not syncing: kernel: panic_on_warn set ...\n\nClear acl_access\/acl_default after posix_acl_release is called to prevent\nUAF from being triggered."},{"lang":"es","value":"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nfsd: borrar acl_access\/acl_default después de liberarlos Si la obtención de acl_default falla, acl_access y acl_default se liberarán simultáneamente. Sin embargo, acl_access aún conservará un puntero que apunta al posix_acl liberado, lo que activará una ADVERTENCIA en nfs3svc_release_getacl como esta: ------------[ cortar aquí ]------------ refcount_t: desbordamiento insuficiente; use after free. ADVERTENCIA: CPU: 26 PID: 3199 at lib\/refcount.c:28 refcount_warn_saturate+0xb5\/0x170 Modules linked in: CPU: 26 UID: 0 PID: 3199 Comm: nfsd Not tainted 6.12.0-rc6-00079-g04ae226af01f-dirty #8 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04\/01\/2014 RIP: 0010:refcount_warn_saturate+0xb5\/0x170 Code: cc cc 0f b6 1d b3 20 a5 03 80 fb 01 0f 87 65 48 d8 00 83 e3 01 75 e4 48 c7 c7 c0 3b 9b 85 c6 05 97 20 a5 03 01 e8 fb 3e 30 ff &lt;0f&gt; 0b eb cd 0f b6 1d 8a3 RSP: 0018:ffffc90008637cd8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff83904fde RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88871ed36380 RBP: ffff888158beeb40 R08: 0000000000000001 R09: fffff520010c6f56 R10: ffffc90008637ab7 R11: 0000000000000001 R12: 0000000000000001 R13: ffff888140e77400 R14: ffff888140e77408 R15: ffffffff858b42c0 FS: 0000000000000000(0000) GS:ffff88871ed00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000562384d32158 CR3: 000000055cc6a000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace:  ? refcount_warn_saturate+0xb5\/0x170 ? __warn+0xa5\/0x140 ? refcount_warn_saturate+0xb5\/0x170 ? report_bug+0x1b1\/0x1e0 ? handle_bug+0x53\/0xa0 ? exc_invalid_op+0x17\/0x40 ? asm_exc_invalid_op+0x1a\/0x20 ? tick_nohz_tick_stopped+0x1e\/0x40 ? refcount_warn_saturate+0xb5\/0x170 ? refcount_warn_saturate+0xb5\/0x170 nfs3svc_release_getacl+0xc9\/0xe0 svc_process_common+0x5db\/0xb60 ? __pfx_svc_process_common+0x10\/0x10 ? __rcu_read_unlock+0x69\/0xa0 ? __pfx_nfsd_dispatch+0x10\/0x10 ? svc_xprt_received+0xa1\/0x120 ? xdr_init_decode+0x11d\/0x190 svc_process+0x2a7\/0x330 svc_handle_xprt+0x69d\/0x940 svc_recv+0x180\/0x2d0 nfsd+0x168\/0x200 ? __pfx_nfsd+0x10\/0x10 kthread+0x1a2\/0x1e0 ? kthread+0xf4\/0x1e0 ? __pfx_kthread+0x10\/0x10 ret_from_fork+0x34\/0x60 ? __pfx_kthread+0x10\/0x10 ret_from_fork_asm+0x1a\/0x30  Kernel panic - not syncing: kernel: panic_on_warn set ...  Borre acl_access\/acl_default después de llamar a posix_acl_release para evitar que se active UAF."}],"metrics":{"cvssMetricV31":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"weaknesses":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","description":[{"lang":"en","value":"CWE-416"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.13","versionEndExcluding":"5.10.235","matchCriteriaId":"083BAD0B-AAB6-42E6-AC7B-963EBC5214F6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.179","matchCriteriaId":"C708062C-4E1B-465F-AE6D-C09C46400875"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.1.129","matchCriteriaId":"2DA5009C-C9B9-4A1D-9B96-78427E8F232C"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.79","matchCriteriaId":"B16AADE5-B2FD-4C14-B4E4-85E8EDAFE775"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.16","matchCriteriaId":"13C8DB18-FC60-425F-84E5-3EDDEC61B2FC"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.13.4","matchCriteriaId":"2A2093ED-74A9-43F9-AC72-50030F374EA4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*","matchCriteriaId":"186716B6-2B66-4BD0-852E-D48E71C0C85F"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*","matchCriteriaId":"0D3E781C-403A-498F-9DA9-ECEE50F41E75"}]}]}],"references":[{"url":"https:\/\/git.kernel.org\/stable\/c\/1fd94884174bd20beb1773990fd3b1aa877688d9","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https:\/\/git.kernel.org\/stable\/c\/2e59b2b68782519560b3d6a41dd66a3d01a01cd3","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https:\/\/git.kernel.org\/stable\/c\/55d947315fb5f67a35e4e1d3e01bb886b9c6decf","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https:\/\/git.kernel.org\/stable\/c\/6f7cfee1a316891890c505563aa54f3476db52fd","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https:\/\/git.kernel.org\/stable\/c\/7faf14a7b0366f153284db0ad3347c457ea70136","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https:\/\/git.kernel.org\/stable\/c\/8a1737ae42c928384ab6447f6ee1a882510e85fa","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https:\/\/git.kernel.org\/stable\/c\/f8d871523142f7895f250a856f8c4a4181614510","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https:\/\/lists.debian.org\/debian-lts-announce\/2025\/03\/msg00028.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https:\/\/lists.debian.org\/debian-lts-announce\/2025\/05\/msg00030.html","source":"af854a3a-2127-422b-91ae-364da2661108"}]}}]}