CVE-2025-21853bpf: avoid holding freeze_mutex during mmap operation
Updated under an hour ago ()
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It affects Linux and 4 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: bpf: avoid holding freeze_mutex during mmap operation We use map->freeze_mutex to prevent races between map_freeze() and memory mapping BPF map contents with writable permissions. The way we naively do this means we'll hold freeze_mutex for entire duration of all the mm and VMA manipulations, which is completely unnecessary. This can potentially also lead to deadlocks, as reported by syzbot in [0]. So, instead, hold freeze_mutex only during writeability checks, bump (proactively) "write active" count for the map, unlock the mutex and proceed with mmap logic. And only if something went wrong during mmap logic, then undo that "write active" counter increment. [0] https://lore.kernel.org/bpf/678dcbc9.050a0220.303755.0066.GAE@google.com/
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from fc9702273e2edb90400a34b3be76f7b08fa3344b before 2ce31c97c219b4fe797749f950274f246eb88c49; from fc9702273e2edb90400a34b3be76f7b08fa3344b before 0d90d9e154144a3a80e9fc0eb9b21b7fc990f68f; from fc9702273e2edb90400a34b3be76f7b08fa3344b before 4759acbd44d24a69b7b14848012ec4201d6c5501; from fc9702273e2edb90400a34b3be76f7b08fa3344b before 29cfda62ab4d92ab94123813db49ab76c1e61b29; from fc9702273e2edb90400a34b3be76f7b08fa3344b before d95607a5f2f9bb08194c9deaf4a5f3e8ba59a9d4; from fc9702273e2edb90400a34b3be76f7b08fa3344b before 271e49f8a58edba65bc2b1250a0abaa98c4bfdbe; from fc9702273e2edb90400a34b3be76f7b08fa3344b before bc27c52eea189e8f7492d40739b7746d67b65beb | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.6 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 5.5 before 6.6.80; from 6.7 before 6.12.17; from 6.13 before 6.13.5; 6.14; 6.14; 6.14 | NVD |
References
- https://git.kernel.org/stable/c/2ce31c97c219b4fe797749f950274f246eb88c49
- https://git.kernel.org/stable/c/0d90d9e154144a3a80e9fc0eb9b21b7fc990f68f
- https://git.kernel.org/stable/c/4759acbd44d24a69b7b14848012ec4201d6c5501
- https://git.kernel.org/stable/c/29cfda62ab4d92ab94123813db49ab76c1e61b29patch
- https://git.kernel.org/stable/c/d95607a5f2f9bb08194c9deaf4a5f3e8ba59a9d4patch
- https://git.kernel.org/stable/c/271e49f8a58edba65bc2b1250a0abaa98c4bfdbepatch
- https://git.kernel.org/stable/c/bc27c52eea189e8f7492d40739b7746d67b65bebpatch
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
- https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.