# CVE-2025-39992: linux: In the Linux kernel, the following vulnerability has been resolved: mm: swap: check for stable address space before... CVE-2025-39992 is fixed in 35 products on 1 platform, first by DEBIAN-CVE-2025-39992, released October 15, 2025. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2025-39992 - Priority: High - CVSS: n/a (important) - EPSS: 0.0020 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Oct 15, 2025 ## Description In the Linux kernel, the following vulnerability has been resolved: mm: swap: check for stable address space before operating on the VMA It is possible to hit a zero entry while traversing the vmas in unuse_mm() called from swapoff path and accessing it causes the OOPS: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000446--> Loading the memory from offset 0x40 on the XA_ZERO_ENTRY as address. Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault The issue is manifested from the below race between the fork() on a process and swapoff: fork(dup_mmap()) swapoff(unuse_mm) --------------- ----------------- 1) Identical mtree is built using __mt_dup(). 2) copy_pte_range()--> copy_nonpresent_pte(): The dst mm is added into the mmlist to be visible to the swapoff operation. 3) Fatal signal is sent to the parent process(which is the current during the fork) thus skip the duplication of the vmas and mark the vma range with XA_ZERO_ENTRY as a marker for this process that helps during exit_mmap(). 4) swapoff is tried on the 'mm' added to the 'mmlist' as part of the 2. 5) unuse_mm(), that iterates through the vma's of this 'mm' will hit the non-NULL zero entry and operating on this zero entry as a vma is resulting into the oops. The proper fix would be around not exposing this partially-valid tree to others when droping the mmap lock, which is being solved with [1]. A simpler solution would be checking for MMF_UNSTABLE, as it is set if mm_struct is not fully initialized in dup_mmap(). Thanks to Liam/Lorenzo/David for all the suggestions in fixing this issue. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool6.12 amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | bpftool6.12-debuginfo amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | dtb-aarch64 opensuse-leap 16.0 | 6.12.0-160000.7.1 | [OPENSUSE-SU-2025:20091-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20091-1.md) | Nov 26, 2025 | | Linux | kernel-64kb opensuse-leap 16.0 | 6.12.0-160000.7.1 | [OPENSUSE-SU-2025:20091-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20091-1.md) | Nov 26, 2025 | | Linux | kernel-64kb sles 16.0 | 6.12.0-160000.7.1 | [SUSE-SU-2025:21147-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21147-1.md) | Nov 26, 2025 | | Linux | kernel-default opensuse-leap 16.0 | 6.12.0-160000.7.1 | [OPENSUSE-SU-2025:20091-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20091-1.md) | Nov 26, 2025 | | Linux | kernel-default sles 16.0 | 6.12.0-160000.7.1 | [SUSE-SU-2025:21147-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21147-1.md) | Nov 26, 2025 | | Linux | kernel-default-base opensuse-leap 16.0 | 6.12.0-160000.6.1.160000.2.4 | [OPENSUSE-SU-2025:20091-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20091-1.md) | Nov 26, 2025 | | Linux | kernel-default-base sles 16.0 | 6.12.0-160000.6.1.160000.2.4 | [SUSE-SU-2025:21147-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21147-1.md) | Nov 26, 2025 | | Linux | kernel-docs opensuse-leap 16.0 | 6.12.0-160000.7.1 | [OPENSUSE-SU-2025:20091-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20091-1.md) | Nov 26, 2025 | | Linux | kernel-docs sles 16.0 | 6.12.0-160000.7.1 | [SUSE-SU-2025:21147-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21147-1.md) | Nov 26, 2025 | | Linux | kernel-kvmsmall opensuse-leap 16.0 | 6.12.0-160000.7.1 | [OPENSUSE-SU-2025:20091-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20091-1.md) | Nov 26, 2025 | | Linux | kernel-kvmsmall sles 16.0 | 6.12.0-160000.7.1 | [SUSE-SU-2025:21147-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21147-1.md) | Nov 26, 2025 | | Linux | kernel-livepatch-6.12.53-69.119 amzn 2023 | 1:1.0-0.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel-obs-build opensuse-leap 16.0 | 6.12.0-160000.7.1 | [OPENSUSE-SU-2025:20091-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20091-1.md) | Nov 26, 2025 | | Linux | kernel-obs-qa opensuse-leap 16.0 | 6.12.0-160000.7.1 | [OPENSUSE-SU-2025:20091-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20091-1.md) | Nov 26, 2025 | | Linux | kernel-obs-qa sles 16.0 | 6.12.0-160000.7.1 | [SUSE-SU-2025:21147-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21147-1.md) | Nov 26, 2025 | | Linux | kernel-rt opensuse-leap 16.0 | 6.12.0-160000.7.1 | [OPENSUSE-SU-2025:20091-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20091-1.md) | Nov 26, 2025 | | Linux | kernel-source opensuse-leap 16.0 | 6.12.0-160000.7.1 | [OPENSUSE-SU-2025:20091-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20091-1.md) | Nov 26, 2025 | | Linux | kernel-source sles 16.0 | 6.12.0-160000.7.1 | [SUSE-SU-2025:21147-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21147-1.md) | Nov 26, 2025 | | Linux | kernel-syms opensuse-leap 16.0 | 6.12.0-160000.7.1 | [OPENSUSE-SU-2025:20091-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20091-1.md) | Nov 26, 2025 | | Linux | kernel-syms sles 16.0 | 6.12.0-160000.7.1 | [SUSE-SU-2025:21147-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21147-1.md) | Nov 26, 2025 | | Linux | kernel-zfcpdump opensuse-leap 16.0 | 6.12.0-160000.7.1 | [OPENSUSE-SU-2025:20091-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20091-1.md) | Nov 26, 2025 | | Linux | kernel-zfcpdump sles 16.0 | 6.12.0-160000.7.1 | [SUSE-SU-2025:21147-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21147-1.md) | Nov 26, 2025 | | Linux | kernel6.12 amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-debuginfo amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-debuginfo-common-aarch64 amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-debuginfo-common-x86_64 amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-devel amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-headers amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-libbpf amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-libbpf-debuginfo amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-libbpf-devel amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-libbpf-static amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-modules-extra amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-modules-extra-common amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-tools amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-tools-debuginfo amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | kernel6.12-tools-devel amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | linux Debian 13.5 (trixie) | 6.12.57-1 | [DEBIAN-CVE-2025-39992](https://patchblox.com/security/data/fix/linux/debian-cve-2025-39992.md) | Oct 15, 2025 | | Linux | linux Debian 14 | 6.16.11-1 | [DEBIAN-CVE-2025-39992](https://patchblox.com/security/data/fix/linux/debian-cve-2025-39992.md) | Oct 15, 2025 | | Linux | perf6.12 amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | perf6.12-debuginfo amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | python3-perf6.12 amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | | Linux | python3-perf6.12-debuginfo amzn 2023 | 1:6.12.53-69.119.amzn2023 | [ALAS2023-2025-1254](https://patchblox.com/security/data/fix/linux/alas2023-2025-1254.md) | Oct 27, 2025 | --- Data as of 2026-11-09T07:25:28Z UTC. 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