{ "document": { "aggregate_severity": { "text": "Critical" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/amazonlinux2els/vex/2026/cve-2026-98507-els_os-amazonlinux2els.json" } ], "tracking": { "current_release_date": "2026-11-07T21:40:35Z", "generator": { "date": "2026-11-07T21:40:35Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-98507-ELS_OS-AMAZONLINUX2ELS", "initial_release_date": "2026-10-18T16:17:00Z", "revision_history": [ { "date": "2026-10-18T16:17:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-11-07T21:40:35Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Security 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"vulnerabilities": [ { "cve": "CVE-2026-98507", "notes": [ { "category": "description", "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/rmap: fix missing barrier between anon_vma init and vma->anon_vma publish\n\nOn arm64 server, we find that a task trying to grab the anon_vma lock\ntriggers hungtask.\n\nINFO: task main:2354726 blocked for more than 120 seconds.\n Tainted: G E 5.10.0-0021.aarch64 #1\n\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\" disables this message.\ntask:main state:D stack: 0 pid:2354726 ppid:2350673 flags:0x00000a01\nCall trace:\n __switch_to+0x7c/0xbc\n __schedule+0x3b4/0x8a0\n schedule+0x50/0xe0\n rwsem_down_write_slowpath+0x3cc/0x6cc\n down_write+0x60/0x260\n __anon_vma_prepare+0x6c/0x210\n do_anonymous_page+0x258/0x660\n handle_pte_fault+0x188/0x214\n __handle_mm_fault+0x1b0/0x380\n handle_mm_fault+0xf4/0x284\n do_page_fault+0x19c/0x494\n do_translation_fault+0xcc/0xf8\n do_mem_abort+0x48/0xac\n el0_da+0x44/0x80\n el0_sync_handler+0x88/0xb4\n el0_sync+0x160/0x180\n\nAfter analyzing the vmcore, we found the anon_vma->root->rwsem.count is\n-1. There is another anon_vma whose anon_vma->root->rwsem.count is 1, the\nanon_vma->root->rwsem.owner shows the lock is held, but the stack of the\ntask shows the task doesn't hold the anon_vma lock.\n\nAfter adding more debugging info, we found __anon_vma_prepare() reuses\nanon_vma and triggers the UAF of anon_vma->root due to missing memory\nbarrier, leading to locking and unlocking two different anon_vma->root,\nthus leading to an anon_vma will never be unlocked, and another anon_vma\ncouldn't be locked anymore.\n\nThis race requires two adjacent VMAs that are not merged but are\nanon_vma-compatible (e.g., they differ in VMA_ACCESS_FLAGS that can be\nchanged by mprotect()). Two threads fault on each VMA concurrently, both\ncalling __anon_vma_prepare() with only mmap_lock held for reading.\n\n THREAD A THREAD B\n__anon_vma_prepare __anon_vma_prepare\n find_mergeable_anon_vma() -> NULL\n anon_vma = anon_vma_alloc();\n anon_vma->root = anon_vma;\n // the two stores may be reordered\n vma->anon_vma = anon_vma;\n // finds A's anon_vma\n anon_vma = find_mergeable_anon_vma(vma);\n anon_vma_lock_write(anon_vma);\n // may still see the old root\n down_write(&anon_vma->root->rwsem);\n anon_vma_unlock_write(anon_vma);\n // see the new root, never unlock old\n up_write(&anon_vma->root->rwsem);\n\nthread A triggers page fault and calls __anon_vma_prepare() to prepare\nanon_vma for the faulting vma. __anon_vma_prepare() allocates and\ninitializes a new anon_vma, and then publishes it to the vma with a plain\nstore. anon_vma_prepare() only requires the mmap_lock to be held for\nreading, so two threads can fault on adjacent VMAs at the same time. \nWhile thread A publishes a new anon_vma, thread B could find the anon_vma\nvia find_mergeable_anon_vma() and then locks anon_vma->root->rwsem.\n\nThe store to anon_vma->root in anon_vma_alloc() and the store to\nvma->anon_vma can be reordered. The anon_vma_lock_write() and spin_lock()\nonly provide acquire semantics, which do not prevent prior stores from\nbeing reordered after them. The release semantics of the corresponding\nspin_unlock() and anon_vma_unlock_write() come too late, the store to\nvma->anon_vma is already published before they take effect. As a result,\nthread B can observe the following order:\n\n vma->anon_vma = anon_vma;\n anon_vma->root = anon_vma;\n\nThe anon_vma slab is SLAB_TYPESAFE_BY_RCU, so a newly allocated anon_vma\nmay reuse memory from a previously freed one. The constructor\n(anon_vma_ctor) does not reset anon_vma->root, and __put_anon_vma()\ndoesn't clear it either, so the old root value persists until\nanon_vma_alloc() overwrites it. If that store isn't v\n---truncated---", "title": "Vulnerability description" } ], "product_status": { "fixed": [ "Amazon-Linux-2:bpftool-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-headers-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:perf-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:python-perf-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64" ], "known_affected": [ "Amazon-Linux-2:bpftool-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:bpftool-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:bpftool-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", 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"external", "summary": "https://git.kernel.org/stable/c/465e222815c8839445d09028fa4c77e70f7f1c7d", "url": "https://git.kernel.org/stable/c/465e222815c8839445d09028fa4c77e70f7f1c7d" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/4cef512a955e4008ae4436a4fc97726976df1fdf", "url": "https://git.kernel.org/stable/c/4cef512a955e4008ae4436a4fc97726976df1fdf" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/7d103fc7b836084af585d9d3471334624354cf26", "url": "https://git.kernel.org/stable/c/7d103fc7b836084af585d9d3471334624354cf26" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/a500df43cde075f6ea4b8bae495d89f2c35b3e16", "url": "https://git.kernel.org/stable/c/a500df43cde075f6ea4b8bae495d89f2c35b3e16" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/aef0f69b515af1c8a4147f68a46b6b81854f46f7", "url": "https://git.kernel.org/stable/c/aef0f69b515af1c8a4147f68a46b6b81854f46f7" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/b6ac0b3f6013c168f22cad97e79967accacb08e1", "url": "https://git.kernel.org/stable/c/b6ac0b3f6013c168f22cad97e79967accacb08e1" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/badedec499f6320742368c73fa77cd63dcf8ca55", "url": "https://git.kernel.org/stable/c/badedec499f6320742368c73fa77cd63dcf8ca55" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/d348a715380bfcc6a611bdf722169d53fd01e735", "url": "https://git.kernel.org/stable/c/d348a715380bfcc6a611bdf722169d53fd01e735" } ], "release_date": "2026-10-18T16:17:00Z", "remediations": [ { "category": "vendor_fix", "date": "2026-11-05T12:53:42.499096Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1793883221", "product_ids": [ "Amazon-Linux-2:bpftool-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-headers-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:kernel-tools-devel-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:perf-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:python-perf-0:5.10.273-274.1999.amzn2.tuxcare.els1.x86_64" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1793883221" }, { "category": "none_available", "date": "2026-10-18T16:17:00Z", "details": "Affected", "product_ids": [ "Amazon-Linux-2:bpftool-0:5.10.259-258.1046.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:bpftool-0:5.10.259-258.1046.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:bpftool-0:5.10.272-271.1109.amzn2.tuxcare.els1.x86_64", "Amazon-Linux-2:bpftool-0:5.10.272-271.1109.amzn2.tuxcare.els2.x86_64", "Amazon-Linux-2:bpftool-0:5.10.273-274.1999.amzn2.x86_64", 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