CVE-2024-44965x86/mm: Fix pti_clone_pgtable() alignment assumption
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: x86/mm: Fix pti_clone_pgtable() alignment assumption Guenter reported dodgy crashes on an i386-nosmp build using GCC-11 that had the form of endless traps until entry stack exhaust and then #DF from the stack guard. It turned out that pti_clone_pgtable() had alignment assumptions on the start address, notably it hard assumes start is PMD aligned. This is true on x86_64, but very much not true on i386. These assumptions can cause the end condition to malfunction, leading to a 'short' clone. Guess what happens when the user mapping has a short copy of the entry text? Use the correct increment form for addr to avoid alignment assumptions.
- 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 16a3fe634f6a568c6234b8747e5d50487fed3526 before 18da1b27ce16a14a9b636af9232acb4fb24f4c9e; from 16a3fe634f6a568c6234b8747e5d50487fed3526 before 25a727233a40a9b33370eec9f0cad67d8fd312f8; from 16a3fe634f6a568c6234b8747e5d50487fed3526 before d00c9b4bbc442d99e1dafbdfdab848bc1ead73f6; 16a3fe634f6a568c6234b8747e5d50487fed3526 builds before 4d143ae782009b43b4f366402e5c37f59d4e4346; 16a3fe634f6a568c6234b8747e5d50487fed3526 builds before 5c580c1050bcbc15c3e78090859d798dcf8c9763; from 16a3fe634f6a568c6234b8747e5d50487fed3526 before ca07aab70dd3b5e7fddb62d7a6ecd7a7d6d0b2ed; from 16a3fe634f6a568c6234b8747e5d50487fed3526 before df3eecb5496f87263d171b254ca6e2758ab3c35c; from 16a3fe634f6a568c6234b8747e5d50487fed3526 before 41e71dbb0e0a0fe214545fe64af031303a08524c | 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 V3.1.0 before V3.1.5 | 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 V3.1.0 before V3.1.5 | 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 V3.1.0 before V3.1.5 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 4.19 before 4.19.320; from 4.20 before 5.4.282; from 5.5 before 5.10.224; from 5.11 before 5.15.165; from 5.16 before 6.1.105; from 6.2 before 6.6.46; from 6.7 before 6.10.5; 6.11 | NVD |
References
- https://git.kernel.org/stable/c/18da1b27ce16a14a9b636af9232acb4fb24f4c9epatch
- https://git.kernel.org/stable/c/25a727233a40a9b33370eec9f0cad67d8fd312f8patch
- https://git.kernel.org/stable/c/d00c9b4bbc442d99e1dafbdfdab848bc1ead73f6patch
- https://git.kernel.org/stable/c/4d143ae782009b43b4f366402e5c37f59d4e4346patch
- https://git.kernel.org/stable/c/5c580c1050bcbc15c3e78090859d798dcf8c9763patch
- https://git.kernel.org/stable/c/ca07aab70dd3b5e7fddb62d7a6ecd7a7d6d0b2edpatch
- https://git.kernel.org/stable/c/df3eecb5496f87263d171b254ca6e2758ab3c35cpatch
- https://git.kernel.org/stable/c/41e71dbb0e0a0fe214545fe64af031303a08524cpatch
- https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://cert-portal.siemens.com/productcert/html/ssa-355557.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.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.