CVE-2026-64089
published 2026-07-19CVE-2026-64089: In the Linux kernel, the following vulnerability has been resolved: batman-adv: tt: fix negative last_changeset_len batadv_piv_tt::last_changeset_len len was…
PriorityP345critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.55%
44.7th percentile
In the Linux kernel, the following vulnerability has been resolved:
batman-adv: tt: fix negative last_changeset_len
batadv_piv_tt::last_changeset_len len was declared as s16, but the field is
never intended to hold a negative value. When a value greater than 32767 is
assigned, it wraps to a negative signed integer.
In batadv_send_my_tt_response(), last_changeset_len is temporarily widened
to s32. The incorrectly negative s16 value propagates into the s32, causing
batadv_tt_prepare_tvlv_local_data() to allocate a full sized buffer but
populates only a small portion of it with the collected changeset. All
remaining bits are kept uninitialized.
Using an u16 avoids this type confusion and ensures that no (negative) sign
extension is performed in batadv_send_my_tt_response().
Affected
58 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= a73105b8d4c765d9ebfb664d0a66802127d8e4c7 < 6314089acf0ddf64376fdc0b1420695504c73f52 | 6314089acf0ddf64376fdc0b1420695504c73f52 |
| linux | linux | >= a73105b8d4c765d9ebfb664d0a66802127d8e4c7 < 55dc41fe8821e9a849e147255ad572bc933a9d15 | 55dc41fe8821e9a849e147255ad572bc933a9d15 |
| linux | linux | >= a73105b8d4c765d9ebfb664d0a66802127d8e4c7 < c424e8519ac78eac5d9f4eecf06208a0d619ec14 | c424e8519ac78eac5d9f4eecf06208a0d619ec14 |
| linux | linux | >= a73105b8d4c765d9ebfb664d0a66802127d8e4c7 < 22d59c72f4a47ffec121d0610f70d0d70c3c11c8 | 22d59c72f4a47ffec121d0610f70d0d70c3c11c8 |
| linux | linux | >= a73105b8d4c765d9ebfb664d0a66802127d8e4c7 < eb235472b52ef36981c5aad330485eaf2382c53b | eb235472b52ef36981c5aad330485eaf2382c53b |
| linux | linux | >= a73105b8d4c765d9ebfb664d0a66802127d8e4c7 < 179eb62506a02d00370bd6478898cb632e10986c | 179eb62506a02d00370bd6478898cb632e10986c |
| linux | linux | >= a73105b8d4c765d9ebfb664d0a66802127d8e4c7 < d29abf70c665730e249d2ec8e1402095ae26bcee | d29abf70c665730e249d2ec8e1402095ae26bcee |
| linux | linux | >= a73105b8d4c765d9ebfb664d0a66802127d8e4c7 < fc92cdfcb295cefa4344d71a527d61b638b7bfc4 | fc92cdfcb295cefa4344d71a527d61b638b7bfc4 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 3.1 < 5.10.258 | 5.10.258 |
| linux | linux_kernel | >= 5.11 < 5.15.209 | 5.15.209 |
| linux | linux_kernel | >= 5.16 < 6.1.175 | 6.1.175 |
| linux | linux_kernel | >= 6.13 < 6.18.34 | 6.18.34 |
| linux | linux_kernel | >= 6.19 < 7.0.11 | 7.0.11 |
| linux | linux_kernel | >= 6.2 < 6.6.142 | 6.6.142 |
| linux | linux_kernel | >= 6.7 < 6.12.92 | 6.12.92 |
| ubuntu | linux | — | — |
| ubuntu | linux-aws | — | — |
| ubuntu | linux-aws-5.15 | — | — |
| ubuntu | linux-aws-fips | — | — |
| ubuntu | linux-azure | — | — |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vendor_redhat9.8CRITICAL
vendor_ubuntu9.1CRITICAL
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construct a malicious NTFS image that, when mounted and operated on, could
expose sensitive information (kernel memory). (CVE-2023-45896)
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
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level, resulting in privilege escalation. (CVE-2025-54518)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- x86 platform drivers;
- Cryptographic API;
- PSP security protocol;
- ARM32 architecture;
- ARM64 architecture;
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It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)
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construct a malicious NTFS image that, when mounted and operated on, could
expose sensitive information (kernel memory). (CVE-2023-45896)
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
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It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- x86 platform drivers;
- PSP security protocol;
- ARM32 architecture;
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- S390 architecture;
- User-Mode Linux (UML);
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Maxim Suhanov discovered that the NTFS file system implementation in the
Linux kernel did not properly validate file name length in certain
situations, leading to an out-of-bounds read. An attacker could use this to
construct a malicious NTFS image that, when mounted and operated on, could
expose sensitive information (kernel memory). (CVE-2023-45896)
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
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situations, leading to an out-of-bounds read. An attacker could use this to
construct a malicious NTFS image that, when mounted and operated on, could
expose sensitive information (kernel memory). (CVE-2023-45896)
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation
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Summary: Several security issues were fixed in the Linux kernel.
Maxim Suhanov discovered that the NTFS file system implementation in the
Linux kernel did not properly validate file name length in certain
situations, leading to an out-of-bounds read. An attacker could use this to
construct a malicious NTFS image that, when mounted and operated on, could
expose sensitive information (kernel memory). (CVE-2023-45896)
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local
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CVE-2024-36898 [HIGH] Linux kernel (NVIDIA Tegra) vulnerabilities
Title: Linux kernel (NVIDIA Tegra) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Maxim Suhanov discovered that the NTFS file system implementation in the
Linux kernel did not properly validate file name length in certain
situations, leading to an out-of-bounds read. An attacker could use this to
construct a malicious NTFS image that, when mounted and operated on, could
expose sensitive information (kernel memory). (CVE-2023-45896)
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation
Red Hat
kernel: batman-adv: tt: fix negative last_changeset_len
vendor_redhat·2026-07-19·CVSS 9.8
CVE-2026-64089 [CRITICAL] CWE-190 kernel: batman-adv: tt: fix negative last_changeset_len
kernel: batman-adv: tt: fix negative last_changeset_len
In the Linux kernel, the following vulnerability has been resolved:
batman-adv: tt: fix negative last_changeset_len
batadv_piv_tt::last_changeset_len len was declared as s16, but the field is
never intended to hold a negative value. When a value greater than 32767 is
assigned, it wraps to a negative signed integer.
In batadv_send_my_tt_response(), last_changeset_len is temporarily widened
to s32. The incorrectly negative s16 value propagates into the s32, causing
batadv_tt_prepare_tvlv_local_data() to allocate a full sized buffer but
populates only a small portion of it with the collected changeset. All
remaining bits are kept uninitialized.
Using an u16 avoids this type confusion and ensures that no (negative) sign
extension is perf
GHSA
In the Linux kernel, the following vulnerability has been resolved: batman-adv: tt: fix negative last_changeset_len batadv_piv_tt::last_changeset_len len was declared as s16, but the field is never
ghsa_unreviewed·2026-07-19
CVE-2026-64089 [CRITICAL] In the Linux kernel, the following vulnerability has been resolved: batman-adv: tt: fix negative last_changeset_len batadv_piv_tt::last_changeset_len len was declared as s16, but the field is never
In the Linux kernel, the following vulnerability has been resolved:
batman-adv: tt: fix negative last_changeset_len
batadv_piv_tt::last_changeset_len len was declared as s16, but the field is
never intended to hold a negative value. When a value greater than 32767 is
assigned, it wraps to a negative signed integer.
In batadv_send_my_tt_response(), last_changeset_len is temporarily widened
to s32. The incorrectly negative s16 value propagates into the s32, causing
batadv_tt_prepare_tvlv_local_data() to allocate a full sized buffer but
populates only a small portion of it with the collected changeset. All
remaining bits are kept uninitialized.
Using an u16 avoids this type confusion and ensures that no (negative) sign
extension is performed in batadv_send_my_tt_response().
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/179eb62506a02d00370bd6478898cb632e10986chttps://git.kernel.org/stable/c/22d59c72f4a47ffec121d0610f70d0d70c3c11c8https://git.kernel.org/stable/c/55dc41fe8821e9a849e147255ad572bc933a9d15https://git.kernel.org/stable/c/6314089acf0ddf64376fdc0b1420695504c73f52https://git.kernel.org/stable/c/c424e8519ac78eac5d9f4eecf06208a0d619ec14https://git.kernel.org/stable/c/d29abf70c665730e249d2ec8e1402095ae26bceehttps://git.kernel.org/stable/c/eb235472b52ef36981c5aad330485eaf2382c53bhttps://git.kernel.org/stable/c/fc92cdfcb295cefa4344d71a527d61b638b7bfc4
2026-07-19
Published