Description
In the Linux kernel, the following vulnerability has been resolved:
crypto: af_alg - Fix incorrect boolean values in af_alg_ctx
Commit 1b34cbbf4f01 ("crypto: af_alg - Disallow concurrent writes in
af_alg_sendmsg") changed some fields from bool to 1-bit bitfields of
type u32.
However, some assignments to these fields, specifically 'more' and
'merge', assign values greater than 1. These relied on C's implicit
conversion to bool, such that zero becomes false and nonzero becomes
true.
With a 1-bit bitfields of type u32 instead, mod 2 of the value is taken
instead, resulting in 0 being assigned in some cases when 1 was intended.
Fix this by restoring the bool type.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 6.1.154 – < 6.1.155, 6.6.108 – < 6.6.109, 6.12.49 – < 6.12.50, 6.16.9 – < 6.16.10 | 6.1.155 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 6.16.10-1 | — |
| Debian 13 | linux | 6.12.57-1 | — |
| Debian 12 | linux | 6.1.158-1 | DSA-6053-1 |
| Debian 11 | linux | 5.10.247-1 | DLA-4404-1 |
| Debian 11 | linux-6.1 | 6.1.158-1~deb11u1 | DLA-4379-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | linux | 6.17.0-6.6 | — |
| Ubuntu 25.10 | linux-aws +2 | 6.17.0-1003.3 | — |
| Ubuntu 25.10 | linux-azure | 6.17.0-1006.6 | — |
| Ubuntu 25.10 | linux-azure-fde | No fix yet | — |
| Ubuntu 25.10 | linux-raspi | 6.17.0-1004.4 | — |
| Ubuntu 25.10 | linux-realtime | 6.17.0-1002.3 | — |
| Ubuntu 25.10 | linux-riscv | 6.17.0-6.6.1 | — |
| Ubuntu 24.04 LTS | linux-riscv +8 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +32 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | kernel-64kb +7 | 6.4.0-150700.53.81.1 | SUSE-SU-2026:4254-1 |
| SLES 15 SP7 | kernel-default-base | 6.4.0-150700.53.81.1.150700.17.45.1 | SUSE-SU-2026:4254-1 |
| SLES 15 SP6 | kernel-64kb +6 | 6.4.0-150600.23.135.1 | SUSE-SU-2026:4369-1 |
| SLES 15 SP6 | kernel-default-base | 6.4.0-150600.23.135.1.150600.12.62.4 | SUSE-SU-2026:4369-1 |
| SLES 15 SP5 | kernel-64kb +4 | 5.14.21-150500.55.192.2 | SUSE-SU-2026:4667-1 |
| SLES 15 SP5 | kernel-default-base | 5.14.21-150500.55.192.2.150500.6.89.2 | SUSE-SU-2026:4667-1 |
| SLES 15 SP5 | kernel-docs +1 | 5.14.21-150500.55.192.1 | SUSE-SU-2026:4667-1 |
| SLES 15 SP4 | kernel-64kb +6 | 5.14.21-150400.24.243.1 | SUSE-SU-2026:4668-1 |
| SLES 15 SP4 | kernel-default-base | 5.14.21-150400.24.243.1.150400.24.122.1 | SUSE-SU-2026:4668-1 |
| SLES 12 SP5 | kernel-syms +2 | 4.12.14-122.328.1 | SUSE-SU-2026:4282-1 |
Show 19 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | kernel-64kb +8 | 6.12.0-160000.37.1 | SUSE-SU-2026:23231-1, SUSE-SU-2026:23221-1 |
| SLES for SAP 16.0 | kernel-default-base | 6.12.0-160000.37.1.160000.2.19 | SUSE-SU-2026:23231-1, SUSE-SU-2026:23221-1 |
| SLES for SAP 15 SP6 | kernel-default-base | 6.4.0-150600.23.135.1.150600.12.62.4 | SUSE-SU-2026:4369-1 |
| SLES for SAP 15 SP6 | kernel-docs +4 | 6.4.0-150600.23.135.1 | SUSE-SU-2026:4369-1 |
| SLES for SAP 15 SP5 | kernel-default-base | 5.14.21-150500.55.192.2.150500.6.89.2 | SUSE-SU-2026:4667-1 |
| SLES for SAP 15 SP5 | kernel-docs +1 | 5.14.21-150500.55.192.1 | SUSE-SU-2026:4667-1 |
| SLES for SAP 15 SP5 | kernel-source +2 | 5.14.21-150500.55.192.2 | SUSE-SU-2026:4667-1 |
| SLES for SAP 15 SP4 | kernel-default-base | 5.14.21-150400.24.243.1.150400.24.122.1 | SUSE-SU-2026:4668-1 |
| SLES for SAP 15 SP4 | kernel-docs +4 | 5.14.21-150400.24.243.1 | SUSE-SU-2026:4668-1 |
| SLES 16.0 | kernel-64kb +8 | 6.12.0-160000.37.1 | SUSE-SU-2026:23237-1, SUSE-SU-2026:23231-1, SUSE-SU-2026:23221-1 |
| SLES 16.0 | kernel-default-base | 6.12.0-160000.37.1.160000.2.19 | SUSE-SU-2026:23231-1, SUSE-SU-2026:23221-1 |
| SLE Micro 6.2 | kernel-default-base | 6.12.0-160000.37.1.160000.2.19 | SUSE-SU-2026:23068-1 |
| SLE Micro 6.2 | kernel-rt +5 | 6.12.0-160000.37.1 | SUSE-SU-2026:23068-1, SUSE-SU-2026:23066-1 |
| SLE Micro 6.1 | kernel-default-base | 6.4.0-52.1.21.34 | SUSE-SU-2026:23529-1 |
| SLE Micro 6.1 | kernel-rt +4 | 6.4.0-52.1 | SUSE-SU-2026:23529-1, SUSE-SU-2026:23528-1 |
| SLE Micro 6.0 | kernel-default-base | 6.4.0-52.1.21.36 | SUSE-SU-2026:23481-1 |
| SLE Micro 6.0 | kernel-rt +4 | 6.4.0-52.1 | SUSE-SU-2026:23481-1, SUSE-SU-2026:23477-1 |
| SLE Micro 5.5 | kernel-default-base | 5.14.21-150500.55.192.2.150500.6.89.2 | SUSE-SU-2026:4667-1 |
| SLE Micro 5.5 | kernel-rt +1 | 5.14.21-150500.13.164.1 | SUSE-SU-2026:4665-1 |
| SLE Micro 5.5 | kernel-source +1 | 5.14.21-150500.55.192.2 | SUSE-SU-2026:4667-1 |
| SLE Micro 5.4 | kernel-default-base | 5.14.21-150400.24.243.1.150400.24.122.1 | SUSE-SU-2026:4668-1 |
| SLE Micro 5.4 | kernel-rt +1 | 5.14.21-150400.15.189.1 | SUSE-SU-2026:4666-1 |
| SLE Micro 5.4 | kernel-source +1 | 5.14.21-150400.24.243.1 | SUSE-SU-2026:4668-1 |
| SLE Micro 5.3 | kernel-default-base | 5.14.21-150400.24.243.1.150400.24.122.1 | SUSE-SU-2026:4668-1 |
| SLE Micro 5.3 | kernel-rt +1 | 5.14.21-150400.15.189.1 | SUSE-SU-2026:4666-1 |
| SLE Micro 5.3 | kernel-source +1 | 5.14.21-150400.24.243.1 | SUSE-SU-2026:4668-1 |
| SLE Live Patching 15 SP7 | kernel-default | 6.4.0-150700.53.81.1 | SUSE-SU-2026:4254-1 |
| SLE Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7-RT_Update_20 | 1-150700.1.3.1 | SUSE-SU-2026:4120-1 |
| SLE Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7_Update_21 | 1-150700.15.3.1 | SUSE-SU-2026:4254-1 |
| SLE Live Patching 15 SP6 | kernel-default | 6.4.0-150600.23.135.1 | SUSE-SU-2026:4369-1 |
| SLE Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_31 | 1-150600.13.3.4 | SUSE-SU-2026:4369-1 |
| SLE Live Patching 15 SP5 | kernel-default | 5.14.21-150500.55.192.2 | SUSE-SU-2026:4667-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_46 | 1-150500.11.3.2 | SUSE-SU-2026:4667-1 |
| SLE Live Patching 15 SP4 | kernel-default | 5.14.21-150400.24.243.1 | SUSE-SU-2026:4668-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_60 | 1-150400.9.3.1 | SUSE-SU-2026:4668-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.328.1 | SUSE-SU-2026:4282-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_87 | 1-8.5.1 | SUSE-SU-2026:4282-1 |
| SLE HPC 15 SP5 | kernel-64kb +3 | 5.14.21-150500.55.192.2 | SUSE-SU-2026:4667-1 |
| SLE HPC 15 SP5 | kernel-default-base | 5.14.21-150500.55.192.2.150500.6.89.2 | SUSE-SU-2026:4667-1 |
| SLE HPC 15 SP5 | kernel-docs +1 | 5.14.21-150500.55.192.1 | SUSE-SU-2026:4667-1 |
| SLE HPC 15 SP4 | kernel-64kb +5 | 5.14.21-150400.24.243.1 | SUSE-SU-2026:4668-1 |
| SLE HPC 15 SP4 | kernel-default-base | 5.14.21-150400.24.243.1.150400.24.122.1 | SUSE-SU-2026:4668-1 |
| SUSE Real Time Module 15 SP7 | kernel-rt +2 | 6.4.0-150700.7.75.1 | SUSE-SU-2026:4120-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | kernel-default-base | 6.12.0-160000.37.1.160000.2.19 | openSUSE-SU-2026:21555-1 |
| openSUSE Leap 16.0 | kernel-rt +11 | 6.12.0-160000.37.1 | openSUSE-SU-2026:21555-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | bpftool +18 | 5.15.0-315.196.5.1.el9uek | ELSA-2025-28048 |
| Oracle Linux 7 | kernel-uek +6 | 5.4.17-2136.351.3.3.el8uek | ELSA-2026-50100, ELSA-2026-50071 |
| Oracle Linux 7 | kernel-uek-tools | 5.4.17-2136.351.3.3.el7uek | ELSA-2026-50100, ELSA-2026-50071 |
Advisories 31
- SSA-457936 SSA-457936: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.7 Siemens ProductCERT · Nov 10, 2026
- ICSA-26-295-11 Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP CISA ICS & IT advisories · Oct 22, 2026
- SUSE-SU-2026:4666-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Oct 16, 2026
- SUSE-SU-2026:4667-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Oct 16, 2026
- SUSE-SU-2026:4665-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Oct 15, 2026
- SUSE-SU-2026:4668-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Oct 15, 2026
- WID-SEC-2025-2407 Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Oct 14, 2026
- SSA-019113 SSA-019113: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.6 Siemens ProductCERT · Oct 13, 2026
- SSA-082556 SSA-082556: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.5 Siemens ProductCERT · Oct 13, 2026
- SUSE-SU-2026:4254-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Oct 8, 2026
- SUSE-SU-2026:4369-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Oct 2, 2026
- SUSE-SU-2026:4282-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Sep 23, 2026
- SUSE-SU-2026:23528-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Sep 15, 2026
- SUSE-SU-2026:23529-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Sep 15, 2026
- SUSE-SU-2026:23477-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Sep 14, 2026
- SUSE-SU-2026:4120-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Sep 14, 2026
- SUSE-SU-2026:23481-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Sep 14, 2026
- SUSE-SU-2026:23231-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Aug 27, 2026
- SUSE-SU-2026:23237-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Aug 27, 2026
- SUSE-SU-2026:23221-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Aug 27, 2026
- SUSE-SU-2026:23066-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Aug 15, 2026
- SUSE-SU-2026:23068-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Aug 15, 2026
- openSUSE-SU-2026:21555-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Aug 12, 2026
- ICSA-26-209-04 Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP CISA ICS & IT advisories · Jul 28, 2026
- ICSA-25-162-05 Siemens SIMATIC S7-1500 CPU family CISA ICS & IT advisories · May 14, 2026
- ELSA-2026-50100 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Feb 7, 2026
- ELSA-2026-50071 Moderate: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 26, 2026
- DLA-4404-1 linux - security update Debian Security (DSA / DLA) · Dec 12, 2025
- ELSA-2025-28048 Important: Unbreakable Enterprise kernel security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Dec 12, 2025
- DLA-4379-1 linux-6.1 - security update Debian Security (DSA / DLA) · Nov 25, 2025
- DSA-6053-1 linux - security update Debian Security (DSA / DLA) · Nov 11, 2025
References
- https://git.kernel.org/stable/c/3a21698ace915a445bce2d0dcfc84b6d2199baf7
- https://git.kernel.org/stable/c/d382d6daf0184490f366562469a5673f65ee2662
- https://git.kernel.org/stable/c/54506c6335690f4ef1b9f154e34f5a604c72c1ed
- https://git.kernel.org/stable/c/8703940bd30b5ad94408d28d7192db2491cd3592
- https://git.kernel.org/stable/c/316b090c2fee964c307a634fecc7df269664b158
- https://git.kernel.org/stable/c/fbe96bd25423e61273d8831e995260b429d850b6
- https://git.kernel.org/stable/c/d0ca0df179c4b21e2a6c4a4fb637aa8fa14575cb