crypto: af-alg - fix NULL pointer dereference in scatterwalk

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Summary

CVECVE-2026-43043
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:50 UTC
Updated2026-05-08 18:57:17 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: crypto: af-alg - fix NULL pointer dereference in scatterwalk The AF_ALG interface fails to unmark the end of a Scatter/Gather List (SGL) when chaining a new af_alg_tsgl structure. If a sendmsg() fills an SGL exactly to MAX_SGL_ENTS, the last entry is marked as the end. A subsequent sendmsg() allocates a new SGL and chains it, but fails to clear the end marker on the previous SGL's last data entry. This causes the crypto scatterwalk to hit a premature end, returning NULL on sg_next() and leading to a kernel panic during dereference. Fix this by explicitly unmarking the end of the previous SGL when performing sg_chain() in af_alg_alloc_tsgl().

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000240000 probability, percentile 0.068060000 (date 2026-05-05)

Problem Types: CWE-476

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 f48d3dd99199180cf37d6253550c55e86372309a git Not specified
CNA Linux Linux affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 f9acceae7b004956851fd4268edf9f518a9bce04 git Not specified
CNA Linux Linux affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 7195350fb78538c25cd790d703f8f2c73ee0d395 git Not specified
CNA Linux Linux affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 7cdf2c6381b21ab5ccf8116750d5582fcd6c0f49 git Not specified
CNA Linux Linux affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 44eafa39363e8d5dfda6a8c6eb6b45458ed4b948 git Not specified
CNA Linux Linux affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 00cbdec17c15d024a1c5002c7365df7624a18a75 git Not specified
CNA Linux Linux affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 4b03ab0a587ec57eb7ddb5c115d84a42896f60f7 git Not specified
CNA Linux Linux affected 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 62397b493e14107ae82d8b80938f293d95425bcb git Not specified
CNA Linux Linux affected 2.6.38 Not specified
CNA Linux Linux unaffected 2.6.38 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f48d3dd99199180cf37d6253550c55e86372309a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7cdf2c6381b21ab5ccf8116750d5582fcd6c0f49 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f9acceae7b004956851fd4268edf9f518a9bce04 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4b03ab0a587ec57eb7ddb5c115d84a42896f60f7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7195350fb78538c25cd790d703f8f2c73ee0d395 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/62397b493e14107ae82d8b80938f293d95425bcb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/00cbdec17c15d024a1c5002c7365df7624a18a75 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/44eafa39363e8d5dfda6a8c6eb6b45458ed4b948 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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