Linux azure: In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - limit RX SG extraction by receive buffer budget Make… (CVE-2026-31677)
In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - limit RX SG extraction by receive buffer budget Make af_alg_get_rsgl() limit each RX scatterlist extraction to the remaining receive buffer budget. af_alg_get_rsgl() currently uses af_alg_readable() only as a gate before extracting data into the RX scatterlist. Limit each extraction to the remaining af_alg_rcvbuf(sk) budget so that receive-side accounting matches the amount of data attached to the request. If skcipher cannot obtain enough RX space for at least one chunk while more data remains to be processed, reject the recvmsg call instead of rounding the request length down to zero.
AI Analysis
Technical Summary
CVE-2026-31677 addresses a flaw in the Linux kernel's crypto af_alg module where the function af_alg_get_rsgl() did not properly limit RX scatterlist extraction according to the receive buffer budget. This could lead to mismatched receive-side accounting and potentially cause the recvmsg call to behave incorrectly by rounding request lengths down to zero instead of rejecting the call when insufficient RX space is available. The issue was fixed by enforcing limits on each extraction to the remaining receive buffer budget. The vulnerability affects Linux Azure kernel versions prior to 6.8.0-1061.64~22.04.1, 6.8.0-1063.71~22.04.1, 6.8.0-1062.69~22.04.1, 6.8.0-1064.72~22.04.1, and 6.8.0-136.136~22.04.1. The CVSS 3.1 vector indicates local attack vector with low complexity, requiring low privileges and no user interaction, impacting availability but not confidentiality or integrity. The vendor advisory confirms a patch is available and recommends updating to fixed versions.
Potential Impact
The vulnerability does not impact confidentiality or integrity but can cause denial of service by affecting availability. Specifically, it can cause the recvmsg call to be rejected improperly or behave unexpectedly due to incorrect receive buffer accounting in the crypto af_alg module. This could disrupt cryptographic operations relying on this subsystem, potentially impacting system stability or availability.
Mitigation Recommendations
A patch is available for this vulnerability. Users should update their Linux Azure kernel to versions 6.8.0-1061.64~22.04.1 or later as specified in the vendor advisory. After applying the update, a system reboot is required to complete remediation. Due to an ABI change in the kernel update, recompilation and reinstallation of third-party kernel modules may be necessary. Follow the vendor's update instructions carefully to ensure full mitigation.
Linux azure: In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - limit RX SG extraction by receive buffer budget Make… (CVE-2026-31677)
Description
In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - limit RX SG extraction by receive buffer budget Make af_alg_get_rsgl() limit each RX scatterlist extraction to the remaining receive buffer budget. af_alg_get_rsgl() currently uses af_alg_readable() only as a gate before extracting data into the RX scatterlist. Limit each extraction to the remaining af_alg_rcvbuf(sk) budget so that receive-side accounting matches the amount of data attached to the request. If skcipher cannot obtain enough RX space for at least one chunk while more data remains to be processed, reject the recvmsg call instead of rounding the request length down to zero.
CVSS v3.1
Score 5.5medium
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-31677 addresses a flaw in the Linux kernel's crypto af_alg module where the function af_alg_get_rsgl() did not properly limit RX scatterlist extraction according to the receive buffer budget. This could lead to mismatched receive-side accounting and potentially cause the recvmsg call to behave incorrectly by rounding request lengths down to zero instead of rejecting the call when insufficient RX space is available. The issue was fixed by enforcing limits on each extraction to the remaining receive buffer budget. The vulnerability affects Linux Azure kernel versions prior to 6.8.0-1061.64~22.04.1, 6.8.0-1063.71~22.04.1, 6.8.0-1062.69~22.04.1, 6.8.0-1064.72~22.04.1, and 6.8.0-136.136~22.04.1. The CVSS 3.1 vector indicates local attack vector with low complexity, requiring low privileges and no user interaction, impacting availability but not confidentiality or integrity. The vendor advisory confirms a patch is available and recommends updating to fixed versions.
Potential Impact
The vulnerability does not impact confidentiality or integrity but can cause denial of service by affecting availability. Specifically, it can cause the recvmsg call to be rejected improperly or behave unexpectedly due to incorrect receive buffer accounting in the crypto af_alg module. This could disrupt cryptographic operations relying on this subsystem, potentially impacting system stability or availability.
Mitigation Recommendations
A patch is available for this vulnerability. Users should update their Linux Azure kernel to versions 6.8.0-1061.64~22.04.1 or later as specified in the vendor advisory. After applying the update, a system reboot is required to complete remediation. Due to an ABI change in the kernel update, recompilation and reinstallation of third-party kernel modules may be necessary. Follow the vendor's update instructions carefully to ensure full mitigation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-31677
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
Threat ID: 6a5b61c02d1edb114c88574a
Added to database: 07/18/2026, 11:21:36 UTC
Last enriched: 08/01/2026, 05:00:15 UTC
Last updated: 09/10/2026, 19:36:53 UTC
Views: 22
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